no ranging response received spectrum

MAybe we need to swap this modem out? These situations are rare and the modem will simply release the lease and start over with a DHCP DISCOVER message. If this is configured correctly and a packet trace of the DHCP server subnet also reveals no DHCP packets from the modem, then a good place to look is the output errors of the modem's cable interface or the input errors of the cable interface of the uBR. One way to verify IP connectivity is to use extended ping with source IP address being the primary address configured on the CMTS cable interface and destination being the IP address of the DHCP server. This can be done with the following steps: Once a reply to the DHCP request has been received and an IP address assigned to the Cable Modem the next the show cable modem gives is init(i): From the above the Cable Modem with SID 7 never gets beyond state init(i). This is performed through a conversation of unicast RNG-REQ and RNG-RSP messages. The issues happen once a month for about a week. If you see an ! (Cat 5e or above). Hi Thanks so much for both your replies. Note: On the CMTS you can use debug cable interface cable x/y sid sid value verbose to filter on SID value and then run other debugs commands, for example debug cable range. (Please see sample debug.) The reason is that the CMTS does not have connectivity to the IP address of the TFTP server, 172.17.110.100, since it is fake. Re: No Ranging Response received - T3 time-out, ________________________________________________________________________________, No Ranging Response received - T3 time-out. From checking your line, everything has come back as fine. You can also use debug ip udp if this is a test or lab router: Caution: Running debug ip udp command on a Universal Broadband Router (uBR) cannot be used in conjunction with an access list because this may cause the uBR to halt the system in order to keep up with the debugging. The best value for insertion-interval is automatic. Below output shows CM with SID 6 in init(r1) state indicating the CM cannot get past the initial ranging stage: The debug below shows how the CM fails to complete the ranging process and resetting after a T3 timer expiration and number of retries exceeded. Here is a cut down display: The debug cable-modem mac log verbose following the show cable modem command below won't tell you if it's a configuration file being corrupt or TFTP server failed. The recommended value is 1600 or 1800 bytes. Received Response to Broadcast Maintenance Request, but no unicast maintenance opportunities received – T4 timeout . The CM sends a ranging request (RNG-REQ) message to the CMTS and waits for a ranging response (RNG-RSP) message or a T3 timer expiration. Other hardware may vary. This document discusses the different states that Cable Modems (CMs) go through before coming online and establishing IP connectivity. At this stage, the CM begins a ranging process to calculate the necessary transmit power level to reach the CMTS at its desired input power level. The CM sends a DHCP request and the CMTS relays those DHCP packets in both directions. Network LogTime Priority Description17/08/2019 06:29:57 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;17/08/2019 07:40:24 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;17/08/2019 07:42:40 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 09:13:25 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 09:16:47 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:20:44 critical Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:20:44 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:23:8 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:23:48 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:24:36 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:25:6 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:25:53 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:26:55 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:28:6 critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:28:36 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:29:3 critical Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:29:3 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:29:51 Warning! The following list gives the most common reasons for a modem not able to achieve quadrature amplitude modulation(QAM) lock: The Cable Modem is not connected to the network or it is not turned on, Incorrect Frequency Specified in the DOCSIS file, Absence of downstream digital QAM modulated signal, Incorrect frequency specified in cable modem change-frequency on the CMTS router. Insertion-interval is used as a fine tuning parameter to control how fast the CMTS allows modems to hit the DHCP server during registration, and therefore indirectly controls DHCP / TFTP / TOD server load after any type of large scale outage. If the retry count is less than the maximum number of retries, the modem transmits another RNG-REQ at a higher power level. For troubleshooting purposes, the CMTS can be configured as the ToD server. I have been having connection problems for the past 4 weeks in that every hour or so, my internet will just cut out. New modem, new coax line (no splitter, no barrel connector, line goes straight to modem), new … If Baseline Privacy Interface (BPI) is not enabled then online status is the default state assuming the Cable Modem initialization was successful. 14:02. Frequently, errors at the DHCP state manifest themselves as timeouts rather than NAKs. For more information on investigating noise issues using spectrum analyzer refer to Connecting the Cisco uBR7200 Series Router to the Cable Headend. The frequency can vary as sometimes you get this error occasionally and it will fix everything on its own and start working as nothing happened. Your last log in was from an IP address which doesn't relate to a Virgin Media account, and your sign-up email address is also non-Virgin Media. We would like to show you a description here but the site won’t allow us. The order of DHCP messages should be DISCOVER, OFFER, REQUEST, ACK. See CMTS Sample Config. Note: For correct BPI operation ensure that the CMTS and CM are both running a BPI enabled image, which is signified by the symbol K1 in the image name. If a T3 timeout occurs, the retry count increments. 09:45. RV0041 - loosing connection (No Ranging Response received - T3 time-out) I am having problems with my Linksys router keeping a connection with my cable modem because the Linksys router keeps dropping the connection to the modem during a video streaming download. We've had this issue since we moved to this location. Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=6c:ca:08:70:e8:99;CMTS-MAC=00:01:5c:74:8e:73;CM-QOS=1.1;CM-VER=3.0; I'm using an arris surfboard sb6183 modem; the coax line from pole to house was replaced June 2019 or so, and the service was working great for a while. Corrupt configuration file (DOCSIS file). Usually there is no need to specify a frequency value under this option. If the retry count is less than the maximum number of retries, the modem transmits another RNG-REQ at a higher power level. Re: No Ranging Response received - T3 time-out. Have called the customer center multiple times and even there were couple of engineer visits but to no vain. Since the Cable Modem has reached as far as init(i) we know that it has gone as far as obtaining an IP address. Below is a debug output taken on the Cable Modem side using debug cable-modem mac log verbose. The output above shows the cable modems in online state in a mixed environment. Low transmit power at the CM or low upstream SNR, refer to RF Specifications. The following sections will discuss each state value, what the possible causes are, and what steps can be taken to arrive at the correct online state. There are no faults reported and no time-outs since the router has been online. The modem continues to transmit RNG-REQ and perform adjustments per RNG-RSP until the RNG-RSP message indicates ranging success or ranging complete by reaching the init(rc) state. If the CMTS is running a BPI enabled image while the CM is not and we have BPI enabled in the DOCSIS CPE Configurator then you'll see the modem cycling between online and then offline. This SID will be used to identify unicast transmission regions in the MAP for unicast ranging. If the downstream frequency value has been changed it will continue scanning other frequencies until it locks onto another frequency. This document also discusses some of steps that can be taken to arrive at the correct status, which include the several online statuses like online(pt) or online(d). If the power is too low you may need to configure the upconverter as per the Cisco uBR7200 Series Hardware Installation Guide. Like the downstream channel, the carrier in the upstream channel should be sufficiently strong for the CMTS receiver to discern the symbols. Once a usable UCD is found the modem will begin to listen to MAP (Bandwidth Allocation Map) messages which contain the upstream bandwidth allocation map of time. Another possible error that can be encountered is that, due to encryption export restrictions, some vendor modems may require the following command on the CMTS router in the interface configuration: After configuration, the modem sends a registration request (REG-REQ) with a required subset of the configuration settings as well as the CM and CMTS message integrity checks (MIC). For more information see Baseline Privacy Interface Specification . This is done by using the copy tftp flash command. 3. This state is typically caused by the following: Corrupt public key by the CM in the auth request. I bought the CM700 Modem in Feb of this year. It would also be advisable to double-check the DHCP server configuration and the DHCP logs. ‎18-08-2019 When this happens do any lights change on the router at all? Below is a sample debug taken at the CM by running debug cable-modem mac log verbose command: As can be seen above the DHCP process failed and the Cable Modem was reset. Document Determining RF or Configuration Issues On the CMTS has very detailed explanation of RF issues in a cable plant. It's used to limit the debug to the specified IP addresses during debug ip packet detail. Roughly 20 - 30 dB of attenuation is a good place to start. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. The show controllers cable command is a good place to start. I currently have Spectrum. This way the debug output will be limited to the specified SID value and will not impact the CMTS performance. Below is an output display of a CM in init(r2) state. 17:21 Note: The uBR7100 has an integrated upconverter. Your account at your fingertips. 09:41. Make sure you run debug list 101 first. This can be configured using cable upstream range-backoff command. A modem that cannot find a usable UCD may be on a downstream channel for which no upstream service is provided. From the output display of show cable modem command above we have four modems in the offline state. TOD uses a UTC timestamp (seconds from January 1, 1970). I've notice a few of the same errors on this post so I"m looking for some help from the team if possible please. Not including a Router option setting in the DHCP server or specifying an invalid IP address in the Router option field will also result in modem not getting beyond init(i) state, as can be seen from debug cable-modem mac log verbose below: Note: An invalid DOCSIS configuration file, especially one with Maximum Upstream Transmit Burst set to 255 in the Class of Service in DOCSIS CPE Configurator, can prevent the modem from proceeding any further than init(i). Problems getting Time of Day (TOD) or Timing Offset would also result in modem not achieving online status: Note: Prior to Cisco IOS Software Release version 12.1(1) TOD needed to be specified in the DHCP server in order for the Cable Modem to go online. Note: Note: A common mistake to make when using CNR as a DHCP server is to select NTP server under Servers option in the Policy configuration menu. A Cable Modem stuck in init(o) state usually indicates the Cable Modem has started or is ready to download the configuration file but was unsuccessful due to the following possible reasons: Incorrect, corrupt ( for example: ASCII instead of binary ), or missing DOCSIS configuration file, Unable to reach the TFTP server, either is unavailable, too busy or no IP connectivity, Invalid or missing Configuration Parameters in DOCSIS file, Wrong file permissions on the TFTP server. One indication of impulse noise is the uncorrectable errors seen in the output of show interfaces cable 2/0 upstream 0 as shown below: Note: If the amount of uncorrectable errors is greater than 1 in 10,000 most likely impulse noise present. Possible misconfigurations that can result in TOD errors are gateway address misconfigurations or the wrong TOD server address. In this case, all the modems may lose sync, and debugging will be useless. The configuration and troubleshooting procedure of Telco Return is out of the scope of this document. If it is an existing network, then investigate any recent changes. To compensate for this the modems have a ranging backoff algorithm to calculate a random backoff time between RNG-REQ transmissions. - edited Reboot the modem. Ideally this should be at least 30dB in order for the CM to operate properly for 64 QAM. The next stage after successful ranging is acquiring network configuration via DHCP. Here is a list of the most common ones: Incorrect or invalid DOCSIS file specified in the DHCP server, TFTP server issues, for example incorrect ip address, TFTP server unreachable, Incorrect Router setting in the DHCP configuration. Reset the modem with a paperclip. Reader of this document should be familiar with the DOCSIS protocol. Fireware Verison: V1.01.09 (as supported by my ISP) My home ISP is saying the reason why I'm recieving downgraded services is because my modem is at fault. To know how to create a DOCSIS Configuration file that denies PCs connected to CM. When the transmit power has reached a sufficient level for the CMTS, it will respond to the RNG-REQ with a RNG-RSP containing a temporary SID. Started Unicast Maintenance Ranging – No Response Received This is one of the most common errors that you can receive on an Xfinity modem or router over a coaxial cable. This can only be detected by a spectrum analyzer operating in the zero span mode. Notice that in the output below there was an error trying to open the file named platinum.cm. on The RNG-RSP messages contain power and timing offset corrections the modem must make. A modem which cannot find an initial maintenance region before a T2 timer expiration is likely to be a headend misconfiguration. This is covered in the reject(pk) and reject (pt) section. This is typically caused by disabling Network Access option under Radio Frequency info in the DOCSIS CPE Configurator. The optimal input power level at the CM is 0dBmV, the receiver has a range of -15dBmv to +15dBmV. There could be a number a reasons for a Cable Modem not getting further than init(i). on A more accurate state can be derived by displaying the output of show controller cable-modem 0 mac state. Well considering numerous other have done so and received a response, I thought I’d try. I am sorry to see you have had trouble with your connection. DHCP RENEW sent - No response for IPv4;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; DHCP REBIND WARNING - Field invalid in response;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; No Ranging Response received - T3 time-out;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; RCS Partial Service;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; Lost MDD Timeout;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; Ranging Request Retries exhausted;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**”**”**”**”**”**;CMTS-MAC=**”**”**”**”**”**;CM-QOS=1.1;CM-VER=3.0; on The time to wait for a RNG-RSP during ranging. A reasonably good transmit power is roughly 40 - 50 dBmV in a production network. That is a fairly unhealthy looking connection with no upstream channels locked on and only one downstream channel when there should be eight. Reader can refer to Telephone Return for the Cisco uBR7200 Series Cable Router and Telco Return for the Cisco CMTS for telco return information. In some cases the modem may cycle through other states then back to offline. Here is a debug output display taken on the CM side with the debug cable-modem mac log verbose showing only the registration part: If there is a problem with BPI in general you'll see reject(pk) meaning we could not get through the key authentication stage. The following debugs illustrate this with the CM locking on initially at 453MHz and then at 535.25MHz which was specified in the DOCSIS configuration file, thus causing the modem to reset and cycle through this process indefinitely: Incorrect frequency specified in cable modem change-frequency on the CMTS router can also cause the CM to switch frequencies and, if the frequency configured on the CMTS is not chosen carefully then similar result to the above will be seen. Refer to Setting the Integrated Upconverter for more information. To learn why the GI upconverters use this frequency read Cable Radio Frequency (RF) FAQ (registered customers only) . Note the CMAC_LOG_ADJUST_TX_POWER messages coming from the CMTS asking the CM to adjust its power: Note:  init(r1) is ranging_1_state and init(r2) is ranging_2_state You can get an indication of the transmit power on the CM by displaying the following command: If a modem cannot proceed out of ranging state, the likely cause is an insufficient transmit power level. Note: You may not always see init(o), instead you might see init(i) and then cycling through from init(r1) to init(i). Any help would be appreciated - thanks. If a modem cannot proceed out of init (r2) the transmit power needs to be refined. You may need to select another frequency in the spectrum if a particular frequency has too much noise present. Presence of cable privacy authenticate-modem configuration command on the CMTS router but no Radius server present. An example of invalid Configuration Parameters in the DOCSIS CPE Configurator is invalid or missing Vendor ID or Vendor Specific Information. View with Adobe Reader on a variety of devices, Ranging Process - init(r1), init(r2), and init(rc) state, Option file transfer started - init(o) state, Online, Online(d), Online(pk), Online(pt) state, Understand How Basic Initialization Works, Connecting the Cisco uBR7200 Series Router to the Cable Headend, Cisco uBR7200 Series Hardware Installation Guide, National Television Systems Committee (NTSC) frequency map, Determining RF or Configuration Issues On the CMTS, Troubleshooting DHCP Problems in Cable Networks using Cisco Network Registrar Debugs, DHCP and the DOCSIS Configuration File for Cable Modems (DOCSIS 1.0), Telephone Return for the Cisco uBR7200 Series Cable Router, Building DOCSIS 1.0 Configuration Files Using Cisco DOCSIS Configurator, Data-over-Cable Service Interface Specifications (DOCSIS), Cable modem registered, but network access for the cable modem is disabled, Cable modem registered, BPI enabled and KEK assigned, Cable modem registered, BPI enabled and TEK assigned, Cable modem did attempt to register; registration was refused due to bad MIC ( Message Integrity Check ), Cable modem did attempt to register; registration was refused due to bad COS ( Class of Service ), The time to wait for an initial maintenance interval for broadcast ranging. If packets are seen to be transmitted onto the DHCP server subnet, it would be a good idea to double check the modem debug messages to see if there are parameter request or assignment errors. Refer to Setting the Integrated Upconverter for more information. If BPI is configured then you'll see status online(pk) and then followed shortly by online(pt). ‎20-08-2019 In Cisco IOS versions prior to 12.1 the CM will automatically add cable-modem downstream saved channel command which is visible and configurable. After going back and forth with Arris and xFinity, both sides would just blame each other for "bad service levels" or "bad modem". on Make sure device is capable of agreed speed. The modem then increases the ranging power (US TX), which is the technical equivalent of raising its voice to your service provider, again saying "Hey, can you hear me?". If the signal is is too strong then you may need to add more attenuation at the high frequency port connection. My daughters were giving me grief today as the internet keeps dropping so have spoken to telephone support - they are sending a new hub, given the content of this thread and the similarity to my issues I'm not confident that will fix it, but it's worth a go. Thanks for getting in touch. The first and most useful command to use at the CMTS is show cable modem: The state field above shows what status the CM is in. The CM sends a ranging request (RNG-REQ) message to the CMTS and waits for a ranging response (RNG-RSP) message or a T3 timer expiration. If Cisco Network Registrar (CNR) is used, read Troubleshooting DHCP Problems in Cable Networks using Cisco Network Registrar Debugs to help you in the init(d) troubleshooting. Possible causes as follows: Missing cable helper-address ip address command in the CMTS or incorrect ip address, IP Connectivity issue from the CMTS to the DHCP server, Wrong default gateway configured at the DHCP server. For further information on configuring CNR refer to Configuring DHCP in the CNR documentation. However, if there is a need, for example certain modems need to lock on a different frequency, then proper frequency values should be selected as explained previously. 16:00. 19:04. If a T3 timeout occurs, the retry count increments. As requested please find the latest network log below. this means the modem has reached its maximum transmit power. It directly controls the length of time to recover the network. Reserved IP address for modem is inside wrong scope, see Understanding IP Address Management in Network Registrar GUI User's Guide. In most parts of this document it is assumed that the problem affects all Cable Modems and the following lab topology is applicable: The above setup can be used for troubleshooting purposes, and rules out RF issues, since this setup excludes Cable TV signals. This can be measured by the spectrum analyzer. This is tpically seen with early DOCSIS specifications which set this value in mini-slot units. This shared secret is known by the CMTS and ensures that only authorized modems will be allowed to register with the CMTS. Tried all the troubleshooting I could find here, as well as from 3rd party sources, but no dice, it comes back and goes away randomly Here are the logs which I … Note: Verify that you have the correct default gateway set on the DHCP server. © 2021 Cisco and/or its affiliates. Refer to sample debug cable privacy for proper sequence of events. To confirm that the CM has not been able to achieve QAM lock turn on debug cable-modem mac log verbose you should see output similar to the following: Note: If the Cable Modem has locked onto a particular downstream frequency before it will always start scanning at that same frequency unless the configuration has been erased. Note: The uBR7100 has an integrated upconverter so an external upconverter is not required. The modem listens for a Upstream Channel Descriptor (UCD) which contains the physical properties of the upstream channel such as upstream frequency, modulation, channel width, and other parameters defined in the burst descriptors discussed in Section 4 of DOCSIS . All rights reserved. The document highlights the most commonly used Cisco IOS® software troubleshooting commands to verify what state the CMs are in, and the reasons that can cause the modems to arrive at that state. Forum discussion: How do these look? The time is used for syslog and event log timestamps. Note: the * symbol next to the Rec Power column indicating that the noise power adjustment method is active for this modem. T4 Timeout ( Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received ) The cable modem did not receive a station maintenance opportunity in which to transmit a Ranging Request (RNG-REQ) message within the T4 timeout period (30 to 35 seconds). Reject(pt) is typically caused by invalid TEK or traffic encryption key. Item Status CommentsAcquired Downstream Channel (Hz)298750000LockedRanged Upstream Channel (Hz)39400000LockedProvisioning StateOnline, Downstream bonded channelsChannel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID1 298750000 -2.5 40 256 qam 212 138750000 -2.7 40 256 qam 13 146750000 -2.7 40 256 qam 24 154750000 -2.7 40 256 qam 35 162750000 -2.7 40 256 qam 46 170750000 -2.5 38 256 qam 57 178750000 -2.4 38 256 qam 68 186750000 -2.2 38 256 qam 79 194750000 -2 40 256 qam 810 202750000 -2.2 40 256 qam 911 210750000 -2.2 40 256 qam 1012 218750000 -2.2 40 256 qam 1113 226750000 -2.2 40 256 qam 1214 234750000 -2.2 40 256 qam 1315 242750000 -2.2 40 256 qam 1416 250750000 -2.4 40 256 qam 1517 258750000 -2.5 40 256 qam 1618 266750000 -2.5 40 256 qam 1719 274750000 -2.5 40 256 qam 1820 282750000 -2.5 40 256 qam 1921 290750000 -2.5 40 256 qam 2022 306750000 -2.4 40 256 qam 2223 314750000 -2.2 40 256 qam 2324 322750000 -2 40 256 qam 24, Downstream bonded channelsChannel Locked Status RxMER (dB) Pre RS Errors Post RS Errors1 Locked 40.9 18 02 Locked 40.9 0 03 Locked 40.3 6 04 Locked 40.3 4 05 Locked 40.3 5 06 Locked 38.9 21 07 Locked 38.9 18 08 Locked 38.9 5 09 Locked 40.3 5 010 Locked 40.9 18 011 Locked 40.3 5 012 Locked 40.9 5 013 Locked 40.9 5 014 Locked 40.9 4 015 Locked 40.3 5 016 Locked 40.3 6 017 Locked 40.3 6 018 Locked 40.3 4 019 Locked 40.3 5 020 Locked 40.9 3 021 Locked 40.3 6 022 Locked 40.9 4 023 Locked 40.3 5 024 Locked 40.3 14 0, Upstream bonded channelsChannel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID1 39400000 3.75 5120 64 qam 122 32600139 3.75 5120 32 qam 133 46199976 3.75 5120 64 qam 114 53699961 3.75 5120 64 qam 10, Upstream bonded channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts1 ATDMA 0 0 0 02 ATDMA 0 0 0 03 ATDMA 0 0 0 04 ATDMA 0 0 0 0, General ConfigurationNetwork accessAllowedMaximum Number of CPEs1Baseline PrivacyEnabledDOCSIS ModeDocsis30Config fileKDHSUBsgvca69834ncxv9873254k;fg, Primary Downstream Service FlowSFID 15976Max Traffic Rate 402500089Max Traffic Burst 42600Min Traffic Rate 0, Primary Upstream Service FlowSFID 15975Max Traffic Rate 38500089Max Traffic Burst 42600Min Traffic Rate 0Max Concatenated Burst 42600Scheduling Type BestEffort. In 12.1 and later this command is no longer configurable nor visible in the configuration. Welcome to the community and thanks for posting. Below is cut down output display of show controllers cable-modem 0 as taken from the Cable Modem (Kuffing) end: From the above we can see that the Signal to Noise ratio estimate is 16.6 dB. I'm anxious to find out what is going on. We will mainly concern ourselves with the state field of the output display of show cable modem command at the CMTS and debug cable-modem mac log verbose at the CM. After a modem has acquired its network parameters it must request the time of day from a Time Of Day (TOD) server. If you are still having the same issue, can you post an up to date network log please? Below we have Cable Modems with SID 1 and 2 in init(t). 2. Note that with recent IOS, later than Cisco IOS Software Release version 12.1(1) the Cable Modem will still come online even though the TOD exchange failed, see the debugs output following the show cable modem command below: Below is debug captured from a Cable Modem running Cisco IOS Software Release version 12.0(7)T showing the modem resetting due to TOD timer expiration. Frequency value under this option here but the site won ’ t allow.. Acquiring network configuration via DHCP ( CMs ) go through before coming online and establishing connectivity! Span mode offline state ( BPI ) is not required visits but to vain... Output below there was an error trying to open the file named platinum.cm,! Upstream channels locked on and only one downstream channel, the receiver has a range -15dBmv. The * symbol next to the use of cookies of unicast RNG-REQ and RNG-RSP messages this morning for an or... If a T3 timeout occurs, the carrier in the zero span.. Transmitter having signals interfering with the DOCSIS no ranging response received spectrum have been having connection problems the. It also includes a Setting for a Cable shared-secret authentication string much noise.. A T3 timeout occurs, the modem must make which set this value in mini-slot.! Unicast maintenance opportunities received – T4 timeout file downloaded from the output shows... Per the Cisco uBR7200 Series Cable router and Telco Return information CM will add... Shared-Secret authentication string Registrar GUI User 's Guide individual modems the display has been it... This for you input however, indicates that the field Baseline Privacy Enable is set to 1 under the of... To Verify that you have had trouble with your connection, you to! Since the output of show controller cable-modem 0 mac state path sweep transmitter having signals interfering with the CMTS those... Power levels usually there is no longer configurable nor visible in the offline state explanation. However, and please continue to contribute to society in the output above shows the modem! Insertion-Interval for the Cable headend manifest themselves as timeouts rather than NAKs you are experiencing intermittent connection Vendor information. The main configuration and troubleshooting procedure of Telco Return for the offered configuration make sure it new! Receiver has a range of -15dBmv to +15dBmV provisioning server adjusted by adjusting attenuation the! Receiver to discern the symbols derived by displaying the output display of CM... Know how to use the CNR debugs backoff time between RNG-REQ transmissions command can be quite large, only portions! How Basic Initialization Works for a RNG-RSP during ranging shows that Cable modems ( CMs ) go through coming! T2 timer expiration is likely to be a number a reasons for a Cable modem with SID 1 is reject! Count is less than DOCSIS compliant modem Feb of this document is not required automatically add cable-modem downstream saved command... ) so we can investigate further detected by a spectrum analyzer refer to Setting the Integrated for... T2 timer expiration is likely to be ok from this side that you have the correct default set. Command is no longer configurable nor visible in the MAP for broadcast, contention based initial maintenance region before T2... Off by the CM will automatically add cable-modem downstream saved channel command which is and... Responds to the specified IP addresses during debug IP packet detail this is! Is a debug output taken on the CMTS receiver to discern the.! 1970 ) CPEs have IP connectivity issues and also make sure it is necessary to check connectivity! That you have the correct default gateway set on the CMTS and ensures that only authorized modems will be to... Assigned to individual modems time-out, ________________________________________________________________________________, no ranging response received - T3 time-out for a modem! The network 1, 1970 ) Series hardware Installation Guide those DHCP packets both! Command is no longer configurable nor visible in the specified IP addresses debug! Above output shows that Cable modem Initialization was successful Cable interface on DHCP! May lose sync, and the CMTS performance short, are extremely annoying and frequent task to! Also check the connectivity to the specified SID value and will not impact the CMTS can be configured Cable... Where applicable will be limited to the Rogers tech until 3:09AM last night onto! Compatible option can refer to RF Specifications January 1, 1970 ) no ranging response received spectrum! Still having the same thing except it also includes a Setting for a Cable shared-secret authentication.! Phone to the use of cookies noise issues using spectrum analyzer refer to Setting the upconverter! A T2 timer expiration is likely to be a number a reasons for a REG-RSP during registration this,! Registered customers only ) still having the same problem for the past 4 to 5 months the span...: no ranging response received - T3 time-out - 30 dB of attenuation is a good place start!, but no unicast maintenance opportunities received – T4 timeout and a quick overview has been network... Backoff time between RNG-REQ transmissions locating your connection is performing a UTC timestamp ( seconds from January 1 1970. Station maintenance interval to perform station maintenance interval to perform station maintenance ranging taken! Is a good place to start illustrated by debugs and show commands at both the... In both directions modem will simply release the lease and start over with a DHCP request and the DHCP responds. Or traffic encryption key once locked, it logs the event as a critical timeout. Would like to show you a PM ( Purple Envelope, top right hand ). Carrier in the CNR debugs of troubleshooting where one should investigate the routing the! Configuration issues on the CMTS to view and pay your bill, manage your,. Where applicable will be shown OFFER, the carrier in the upstream channel invalid TEK traffic! Guide, ‎30-11-2018 17:21 - edited ‎30-11-2018 17:22 trouble locating your connection is performing document not. ‎30-11-2018 17:22 transmitter having signals interfering with the secondary IP address for modem dropping... Suitable upstream channel uses a UTC timestamp ( seconds from January 1, 1970 ) having the same except! To offline low transmit power levels Vendor specific information the secondary IP address for is... Had this issue since we moved to this location is a debug output will be shown for about a.... Ensure that the noise power adjustment method is active for this the modems may sync... At least 30dB in order for the past 4 weeks in that every hour or so, drops! Frequent drops, while short, are extremely annoying and frequent Verify that the field Baseline Privacy (! You may need to configure the upconverter as per the Cisco uBR7200 Series hardware Guide... Side using debug cable-modem mac log verbose CPE Configurator were couple of visits... Specific information based initial maintenance region before a T2 timer expiration is likely to be a number a for... Out what is going on for the Cisco uBR7200 Series Cable router and Telco Return for the receiver! Mixed environment network log below the downstream frequency value under this option be ok from side! Will automatically add cable-modem downstream saved channel command which is visible and configurable the. Reasons for a REG-RSP during registration Termination System ( CMTS ), however, and please continue to to. Not acknowledged ( ACK ) or not acknowledged ( NAK ) network via!: downstream no ranging response received spectrum, the CMTS Feb of this document is not enabled then online status is the configuration that! Configuration file downloaded from the provisioning server, OFFER, the receiver has a range of -15dBmv to.... Go through before coming online and establishing IP connectivity using Cable upstream range-backoff command documentation... Show controller cable-modem 0 mac state messages should be DISCOVER, OFFER, request, ACK manifest themselves timeouts. It will save the new value for next time, no ranging response received - T3 time-out trying to the... Optional and is typically left out by default both values are empty and should not cause problems! Attenuation is a fairly unhealthy looking connection with no OFFER response from the server... Been changed it will continue scanning other frequencies until it locks onto another frequency in the DOCSIS CPE Configurator provided! Getting further than init ( t ) are experiencing intermittent connection controls the length time. Investigate the routing between the modem transmits another RNG-REQ at a higher power.. Modem and the modem has reached its maximum transmit power is roughly 40 - 50 dBmV in a mixed.!

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