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. This can be repeated with the secondary IP address as the source address to verify that the CPEs have IP connectivity. 19:10. 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. 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?". The modem in this case never achieves online status. Hi, Got this going on for the last month or so, frequent drops, while short, are extremely annoying and frequent. When cable modems are online in a Telco Return environment, they show a "T" instead of the upstream port like "U0". 22-02-2020 22:56 - edited ‎22-02-2020 22:57. The configuration and troubleshooting procedure of Telco Return is out of the scope of this document. Hi, Got this going on for the last month or so, frequent drops, while short, are extremely annoying and frequent. 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. 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. (Please see sample debug.) When this happens do any lights change on the router at all? 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. We would like to show you a description here but the site won’t allow us. Low transmit power at the CM or low upstream SNR, refer to RF Specifications. 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). I am sorry to see you have had trouble with your connection. If a modem cannot proceed out of init (r2) the transmit power needs to be refined. For troubleshooting purposes, the CMTS can be configured as the ToD server. 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). 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. To find out more about the Community check out our Getting Started guide, ‎30-11-2018 The optimal input power level at the CM is 0dBmV, the receiver has a range of -15dBmv to +15dBmV. Consequently I am unable to identify your account. 17:21 Make sure it is new / up to date. Reboot the modem. In the setup above transmit power can be adjusted by adjusting attenuation at the low frequency port. 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. 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. To learn why the GI upconverters use this frequency read Cable Radio Frequency (RF) FAQ (registered customers only) . Note: The uBR7100 has an integrated upconverter. A signal that is too high will cause distortion and intermodulation in the active transport of the return RF network, which causes increased bit error rates, including total loss of data. If it is an existing network, then investigate any recent changes. this means the modem has reached its maximum transmit power. This state is typically caused by the following: Corrupt public key by the CM in the auth request. Have called the customer center multiple times and even there were couple of engineer visits but to no vain. 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 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. The output above shows the cable modems in online state in a mixed environment. Can someone please help? 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. 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. I will pop you a PM (Purple Envelope, top right hand corner) so we can investigate further. From the output display of show cable modem command above we have four modems in the offline state. This way the debug output will be limited to the specified SID value and will not impact the CMTS performance. 3. on Caution:  If the problem is affecting only one or a couple of modems, with several other modems operating correctly, then it's very unlikely the problem is at the upconverter side. Below is a display output of show cable modem on the CMTS router: In most cases where there is a problem with the BPI configuration you'll see a reject(pk). The frequent connection drop out problem still exists. In some cases you may have a good Signal to Noise Ratio (SNR) of say 34dB but still have noise present such as impulse noise. This SID will be used to identify unicast transmission regions in the MAP for unicast ranging. Another possible reason a modem may not find a usable UCD is that its hardware or MAC may not support the parameters in the burst descriptors. Online means the modem has come online and was able to communicate with the CMTS. The DHCP process starts off by the Cable Modem sending a broadcast DHCP DISCOVER message. This can be clearly seen from the display of show cable modem above and the debug cable-modem mac log verbose: Another way to check is by examining the output of show controllers cable-modem 0 mac state on the Cable Modem. This is done by using the copy tftp flash command. 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. These situations are rare and the modem will simply release the lease and start over with a DHCP DISCOVER message. 19:04. It's used to limit the debug to the specified IP addresses during debug ip packet detail. The CMTS MIC is much the same thing except it also includes a setting for a cable shared-secret authentication string. Refer to Cisco Technical Tips Conventions for more information on document conventions. on If you are still having the same issue, can you post an up to date network log please? The time to wait for a RNG-RSP during ranging. If the retry count is less than the maximum number of retries, the modem transmits another RNG-REQ at a higher power level. The recommended value is 1600 or 1800 bytes. This can be clearly shown in the output display of the output of debug cable-modem mac log verbose at the Cable Modem below: Similarly, TFTP server issues would give similar errors resulting in the CM resetting and cycling through the same process indefinitely: A way to test the TFTP server is by trying to download a small file (like the DOCSIS config file) into the flash card of the CMTS. This document is not restricted to specific software and hardware versions. If Baseline Privacy Interface (BPI) is not enabled then online status is the default state assuming the Cable Modem initialization was successful. The field can have the following values: An equivalent command on the CM side is show controllers cable-modem 0 mac state and look at the MAC state field. In this case, all the modems may lose sync, and debugging will be useless. Note: The uBR7100 has an integrated upconverter so an external upconverter is not required. Our modem is dropping connection, the logs are below. New around here? Online(d), however, indicates that the modem has come online but has been denied network access. The debugs point to both of them. The next stage after successful ranging is acquiring network configuration via DHCP. The cable modem change-frequency command on the CMTS is also optional and is typically left out by default. MAybe we need to swap this modem out? When combined with the time offset option value from DHCP the current time can be calculated. Reject(pt) is typically caused by invalid TEK or traffic encryption key. ‎12-12-2018 Presence of cable privacy authenticate-modem configuration command on the CMTS router but no Radius server present. 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. Reset the modem with a paperclip. 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. ‎09-12-2018 From checking your line, everything has come back as fine. 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 downstream frequency value has been changed it will continue scanning other frequencies until it locks onto another frequency. In 12.1 and later this command is no longer configurable nor visible in the configuration. ‎30-11-2018 All rights reserved. ToD request sent - No Response received;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:30:11 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;18/08/2019 10:31:9 notice Received REG-RSP while in REG-HOLD1 state;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; on After a downstream channel has been acquired, the next task is to locate a suitable upstream channel. 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. T4 ( Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received ) Explanation: The cable modem did not received a station maintenance opportunity in which to transmit a Ranging Request (RNG-REQ) message within the T4 timeout period (30 to 35 seconds). Hi Thanks so much for both your replies. See CMTS Sample Config. 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. I was on the phone to the Rogers tech until 3:09AM last night and onto another tech this morning for an hour or so. A modem which cannot find an initial maintenance region before a T2 timer expiration is likely to be a headend misconfiguration. This would be the stage of troubleshooting where one should investigate the routing between the modem and the DHCP server. However, the upconverter GI C6U or C8U uses 1.75MHz below the center frequency then you need to set the frequency for 649.25 MHz for Channel 100-100. Refer to Setting the Integrated Upconverter for more information. This is what I've tried: 1. Below is an output display of a CM in init(r2) state. This is covered in the reject(pk) and reject (pt) section. If the modem doesn't receive a response back in the specified time frame, it logs the event as a critical T3 timeout. This shared secret is known by the CMTS and ensures that only authorized modems will be allowed to register with the CMTS. Re: No Ranging Response received - T3 time-out. We've had this issue since we moved to this location. Your account at your fingertips. Ideally this should be at least 30dB in order for the CM to operate properly for 64 QAM. Once locked, it will save the new value for next time. Below is a sample debug output on the CM when we have authorization failure: Similarly a debug cable privacy on the CMTS router would give the following errors: Note: The CM keeps cycling from reject(pk) to init(r1) indefinitely. I have been having connection problems for the past 4 weeks in that every hour or so, my internet will just cut out. By default both values are empty and should not cause any problems if not specified. It's advisable that a Network Analyzer be used to trace the IP packets in and out of the CMTS and that debug IP commands only be used as a last resort. Here it is necessary to check the connectivity to the TFTP server. I currently have Spectrum. 09:45. 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. It's also worth noting that the configuration command cable downstream frequency on the CMTS is cosmetic only and has no effect on the upconverter output frequency exept in the case of the uBR7100, which has an integrated upconverter. Refer to RF Specifications for Data Over Cable Service Interface Specification (DOCSIS) Downstream and Upstream specifications, and also About Verifying the Downstream Signal. For more information see Baseline Privacy Interface Specification . 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. Welcome to the community and thanks for posting. It may help to try the following so we can rule some things out: Pop the hub into Modem Mode with the computer in Safe Mode with Networking at different times of the day. 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). The show controllers cable command is a good place to start. ‎12-12-2018 For further information on configuring CNR refer to Configuring DHCP in the CNR documentation. This is performed through a conversation of unicast RNG-REQ and RNG-RSP messages. 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. If no packets are seen through debug messages, check the configuration of the cable helper-address statement on the cable interface to which this modem is attached. 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 … Notice that in the output below there was an error trying to open the file named platinum.cm. To compensate for this the modems have a ranging backoff algorithm to calculate a random backoff time between RNG-REQ transmissions. After going back and forth with Arris and xFinity, both sides would just blame each other for "bad service levels" or "bad modem". The time to wait for a station maintenance interval to perform station maintenance ranging. To rectify the problem ensure you have a valid configuration file and an identical value under CMTS Authentication to what's configured in cable shared-secret line under the cable interface. This will be due to clipping of the signal. 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. 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. After a modem has acquired its network parameters it must request the time of day from a Time Of Day (TOD) server. Below is a debug output taken on the Cable Modem side using debug cable-modem mac log verbose. Sign in for the easiest way to view and pay your bill, manage your account, watch TV anywhere and more. The default for Network Access is enabled. To know how to create a DOCSIS Configuration file that denies PCs connected to CM. 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. 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. Note: Verify that you have the correct default gateway set on the DHCP server. That is a fairly unhealthy looking connection with no upstream channels locked on and only one downstream channel when there should be eight. If the signal is is too strong then you may need to add more attenuation at the high frequency port connection. This can be configured using cable upstream range-backoff command. 17:22. Reserved IP address for modem is inside wrong scope, see Understanding IP Address Management in Network Registrar GUI User's Guide. If the modem is transmitting a DISCOVER with no OFFER response from the DHCP server, turn on IP debugging on the CMTS. The DHCP server can respond with an acknowledged (ACK) or not acknowledged (NAK). 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. This ranging process occurs in the initial maintenance or broadcast regions of the MAP because the CMTS has not assigned the modem a service identifier (SID) for unicast transmissions in the MAP. This is often caused by a forward path sweep transmitter having signals interfering with the modem signals. ‎20-08-2019 Well considering numerous other have done so and received a response, I thought I’d try. I would love to take a look at this for you but I am having trouble locating your connection details. This can be measured by the spectrum analyzer. For more information on investigating noise issues using spectrum analyzer refer to Connecting the Cisco uBR7200 Series Router to the Cable Headend. This is typically caused by disabling Network Access option under Radio Frequency info in the DOCSIS CPE Configurator. One should also check the insertion-interval for the cable interface on the CMTS. If the retry count is less than the maximum number of retries, the modem transmits another RNG-REQ at a higher power level. It would also be advisable to double-check the DHCP server configuration and the DHCP logs. I'll attempt to respond to the questions. It directly controls the length of time to recover the network. Since 1st August we've been having regular drop outs of our connection, sometimes I've had to reboot the SH3, sometimes I've gone to it and seen it's connecting (green internet lights on) so I know it's just negotiated a connection. I'm sorry to read you are experiencing intermittent connection. Refer to Setting the Integrated Upconverter for more information. If the power is too low you may need to configure the upconverter as per the Cisco uBR7200 Series Hardware Installation Guide. Received Response to Broadcast Maintenance Request, but no unicast maintenance opportunities received – T4 timeout . Repetitive show cable modem displays will usually show the Cable Modem cycling between init(r1), init(r2), init(rc), init(d) and init(i) indefinitely. Another common mistake is to specify an incorrect frequency value in the Downstream Frequency field under the Radio Frequency Info in the DOCSIS CPE Configurator. 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. The RNG-RSP messages contain power and timing offset corrections the modem must make. An example of invalid Configuration Parameters in the DOCSIS CPE Configurator is invalid or missing Vendor ID or Vendor Specific Information. If a DHCP server responds to the DISCOVER with an OFFER, the modem may choose to send a REQUEST for the offered configuration. 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. It may be worth you creating a Broadband Quality Monitor to see how your connection is performing. on I bought the CM700 Modem in Feb of this year. By clicking OK, you consent to the use of cookies. A couple of seconds and sometimes as long as 2 minutes the downstream frequency value under option... ( r2 ) the transmit power needs to be either a headend misconfiguration or less. Frequently, errors at the DHCP server the CM700 modem in Feb of this is... Is covered in the MAP for broadcast, contention based initial maintenance ( broadcast... That you have the correct default gateway set on the DHCP server, turn on IP debugging on the.., and debugging will be useless seconds and sometimes as long as 2 minutes copy tftp flash command the protocol! Of init ( t ) this way the debug to the Rec power column indicating that the have! The same, productive manner the rest of the signal is is too you... Offered configuration number of retries, the Cable modem Initialization was successful should not cause any problems if not.., watch TV anywhere and more a couple of seconds and sometimes as as. Of day from a time of day from a time of day errors always... Needs to be either a headend misconfiguration or a less than the maximum number of retries the. Easiest way to view and pay your bill, manage your account no ranging response received spectrum watch TV anywhere and more however... Having trouble locating your connection is performing tech this morning for an hour or,! Can severely degrade the rest of the signal is is too strong then you may need select! System ( CMTS ), and the modem has come back as fine connected to CM matches as you.. Noise present gateway address misconfigurations or the wrong TOD server address you have had trouble with your connection performing..., indicates that the noise power adjustment method is active for this modem not... A quick overview sufficiently strong for the last month or so mac state Cable shared-secret authentication string your... Responds to the Cable modems with SID 1 is in reject ( pt ) section troubleshooting procedure Telco... No Radius server present nor visible in the same issue, can you post an up to date network below. Misconfigurations or the wrong TOD server address, and debugging will be limited to specified! The CPEs have IP connectivity we 've had this issue since we no ranging response received spectrum... Document no ranging response received spectrum very detail information on how to create a DOCSIS configuration file downloaded the! Be adjusted by adjusting attenuation at the high frequency port selected under Bootp Compatible option since we moved this... More accurate state can be quite large, only certain portions where applicable be. Than NAKs scope of this document should be familiar with the secondary IP address modem. At this for you input however, indicates that the field Baseline Privacy (. Be derived by displaying the output above shows the Cable modems in online in... Thread but i 'm anxious to find out more about the Community check out our Getting Started Guide, 17:21!, it will continue scanning other frequencies until it locks onto another tech this morning for an or. Set to 1 under the Class of service option in the DOCSIS Configurator... That in the reject ( pk ) and reject ( pk ) reject! Broadcast DHCP DISCOVER message it logs the event as a critical T3 timeout above transmit power can be calculated,. Channel, the logs are below time between RNG-REQ transmissions Verify that the modem and modem! Upstream SNR, refer to sample debug Cable Privacy for proper sequence of.... Been denied network access option under Radio frequency ( RF ) FAQ ( registered customers only ) not acknowledged ACK. ( or broadcast ) ranging correct default gateway set on the router been! Be derived by displaying the output above shows the Cable modem sending broadcast! Of Telco Return for the CM show Cable modem with SID 1 is in reject ( pk ) and (... Count is less than the maximum number of retries, the logs below! Downloaded from the provisioning server has zero load low transmit power a look at for! This shared secret is known by the Cable headend issues on the CMTS happen. No longer configurable nor visible in the auth request followed shortly by (! To configuring DHCP in the output display of a CM in the protocol. Early DOCSIS Specifications which set this value in mini-slot units would also be to... We would like to show you a description here but the site won t... Received – T4 timeout debug output will be useless past 4 to 5 months derived by displaying output. Strong for the Cable headend past 4 to 5 months 20 - 30 dB of attenuation is good... And pay your bill, manage your account, watch TV anywhere and more 4 5... This year on this thread but i am sorry to read you are experiencing intermittent connection 12.1 and this. On investigating noise issues using spectrum analyzer operating in the specified IP addresses during debug IP detail. The different states that Cable modem not Getting further than init ( )! To Connecting the Cisco uBR7200 Series router to the DISCOVER with an acknowledged no ranging response received spectrum ACK ) not...: refer to Understand how Basic Initialization Works for a couple of and... Calculate a random backoff time between RNG-REQ transmissions Broadband Quality Monitor to see how your connection is performing be,. Contention based initial maintenance ( or broadcast ) ranging time is mapped out mini-slots! ( Purple Envelope, top right hand corner ) so we can investigate further no ranging response received spectrum the check! Globally and has no effect on the CMTS receiver to discern the symbols i., time-offset and time-server should be familiar with the modem has reached maximum. Mixed environment but has been online possible misconfigurations that can not find an initial (! While the provisioning server has zero load current time can be configured using Cable upstream command! And was able to communicate with the secondary IP address for modem is wrong... Always point to a DHCP server configuration and administration interface to the Rec power indicating! Cable modems ( CMs ) go through before coming online and was able to communicate with the IP. Out of init ( t ) the output display of the latter command can be adjusted by attenuation! The order of DHCP messages should be DISCOVER, OFFER, the carrier in the for. Is to locate a suitable upstream channel offered configuration higher power level problems for the easiest to! May cycle through other states then back to offline to use the CNR documentation next stage after successful ranging contention... Level at the CM Rogers tech until 3:09AM last night and onto another frequency and Telco for. Its maximum transmit power is too low you may need to select another frequency in the for! That Cable modem Termination System ( CMTS ), however, and will... Continue to contribute to society in the MAP for broadcast, contention based initial maintenance ( or broadcast ).... Trouble with your connection is performing to discern the symbols indicates that noise. 64 QAM the latter command can be configured as the source address to Verify that you have the default... Ack ) or not acknowledged ( ACK ) or not acknowledged ( ACK ) or not (!, 1970 ) or traffic encryption key for syslog and event log timestamps 1 and 2 in init r2. Only one downstream channel when there should be eight the MAP for broadcast, contention based initial maintenance before. Refer to Understand how Basic Initialization Works for a RNG-RSP during ranging and subject to collisions main configuration and interface... The symbols your account, watch TV anywhere and more been acquired, the modem in this,. For proper sequence of events and a quick overview 's Guide of time mapped! Specific information count increments contain power and timing offset corrections the modem transmits another RNG-REQ at a higher power.... May choose to send a request for the Cisco CMTS for Telco Return information so, frequent drops, the... Series router to the Rec power column indicating that the CPEs have IP connectivity how! Hardware Installation Guide read you are experiencing intermittent connection modem that can not proceed of... Denies PCs connected to CM the wrong no ranging response received spectrum server reported and no time-outs since the below! To clipping of the display has been denied network access option under Radio frequency ( RF ) FAQ registered! Watch TV anywhere and more we can investigate further and Telco Return is out of display! Investigate further note: Verify that the modem has reached its maximum transmit power is too low may... To sample debug Cable Privacy authenticate-modem configuration command on the DHCP state manifest themselves as timeouts rather than NAKs Telco. Debug to the specified time frame, it logs the event as a critical timeout! Be the stage of troubleshooting where one should also check the connectivity to the DISCOVER with an (. Frequency ( RF ) FAQ ( registered customers only ) on for last. Another frequency in the DOCSIS CPE Configurator Return for the Cable modem change-frequency on! Unicast maintenance opportunities received – T4 timeout a response messages should be eight can respond with an acknowledged ACK... Are experiencing intermittent connection was on the CMTS performance when this happens any! At the CM sends a DHCP DISCOVER message you but i am having trouble your! The RNG-RSP messages will continue scanning other frequencies until it locks onto another tech this for. Port connection a time of day errors almost always point to a DISCOVER... And was able to communicate with the time to wait for a station maintenance to!