2811 w/ NM-1CE1T1-PRI & PVDM2-36DM - Modem lines being marked "B" Bad

We recently setup a new 2811 router (IOS 15.0(1)M7) for remote dialup access. It has a ISDN PRI network module NM-1CE1T1-PRI and a 36 port Digital Modem Module (PVDM2-36DM) installed to receive the inbound modem calls.
When the router is booted up, inbound remote dialup connections work fine for several hours. Then the router digital modem lines begin to stop working. For example, an inbound call is made but the modem tone does not answer. However a "show modem call-stats" shows that a line becomes active with a "*" symbol. When the call is hung up, the line remains in an active "*" state. Eventually the state changes to a "B - Modem is marked bad and cannot be used for taking calls". This symptom will repeat itself with each new inbound call until all of the lines are marked "B". Only a router reboot will temporarily correct the problem.
Additional symptom, "show modem version" changes to "NiOS Not Responding".
#sh modem ver
Slot 0:
PVDM 1: PVDMII-36DM - HW Version 1, FPGA Version 3.3, NiOS Not Responding
 Modem 0/386-0/397:
    PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F
    Firmware: Exp_V3_12_2
 Modem 0/398-0/409:
    PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F
    Firmware: Exp_V3_12_2
 Modem 0/410-0/421:
    PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F
    Firmware: Exp_V3_12_2

Hi Ismel,
Modem firmware looks good to me but you can still try a firmware upgrade to V3_12_3.
If it is random number selection of bad modem then I suspect that it's an ISP issue and B-channel of ISP while termination of call, leaving the modem in Bad state.
HTH
Amit

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    B (# of bytes in Mux Data Frame)
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    150
    M (# of Mux Data Frames in FEC Data Frame)
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    T (Mux Data Frames over sync bytes)
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    322883
    Super Frame Errors
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    RS Correctable Errors
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    0
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    Thanks for the link, its a great help! However I am unable to configure a modem-pool. In global config mode "modem-pool" is an unrecognised command. There is no problem with the modems as the router recognises the PVDM2 modem bank when I show diagnostics.
    When issuing 'sh line' I can also see the 12 modem lines 0/322 - 0/333. They also show up automatically as 12 individual asynch interfaces in the config.
    Im running IOS 12.4(9)T4
    Could it be there is alternative config required for these types of modems?
    Thanks again,

  • Remotely Access router 2811 via AUX and modem speed configuration

    I have got 2811 router that is connected to analogue modem (56000), and my PC is connected to another analogue modem (33000)
    The intial configuration for the router was :
    Router2811#show run | begin line aux
    line aux 0
    exec-timeout 20 0
    password xxx
    logging synchronous
    login
    modem InOut
    stopbits 1
    flowcontrol hardware
    Router2811#show line
    Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
    * 0 0 CTY - - - - - 0 0 0/0 -
    * 1 1 AUX 9600/9600- inout - - - 0 0 10/0 -
    322 322 VTY - - - - - 0 0 0/0 -
    323 323 VTY - - - - - 0 0 0/0 -
    324 324 VTY - - - - - 0 0 0/0 -
    325 325 VTY - - - - - 0 0 0/0 -
    326 326 VTY - - - - - 0 0 0/0 -
    Line(s) not in async mode -or- with no hardware support:
    2-321
    It did not work when remotely I tried to login to the router !!! it kept disconne
    What I did was this :
    Router2811#config ter
    Router2811(config)#line 1
    Router2811(config-line)# modem autoconfiguration discovery
    The router automatically discover modem's speed 115200 and replaced the 9600 in the configuration above.
    Router2811#show run | begin line aux
    line aux 0
    exec-timeout 20 0
    password 7 1040074B5240130C
    logging synchronous
    login
    modem InOut
    speed 115200,,,,,,,,this has been added to the configuration as well
    stopbits 1
    flowcontrol hardware
    Router2811#show line
    Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
    * 0 0 CTY - - - - - 0 0 0/0 -
    * 1 1 AUX 115200/115200- inout - - - 0 0 10/0,,,,,before it was 9600
    322 322 VTY - - - - - 0 0 0/0 -
    323 323 VTY - - - - - 0 0 0/0 -
    324 324 VTY - - - - - 0 0 0/0 -
    325 325 VTY - - - - - 0 0 0/0 -
    326 326 VTY - - - - - 0 0 0/0 -
    Line(s) not in async mode -or- with no hardware support:
    2-321
    Now remotely I was able to access the router.
    But when I tried to reduce the speed from 115200 to 56000 (modem speed), my modem got disconnected and then I reduced the speed to 9600, but same problem happened ( modem got disconnected ).
    Modem got disconnected after I received these funny characters :
    æ€æ€f€˜€æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†
    æ†æ†æ†æ†æ†æ†æ††€†€æ€
    æ€æ€f€˜€æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ
    †æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ††€†€æ€
    æ€æ€f€˜€æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ†æ
    †æ†æ††€†€æ€˜€€~ff€˜þf† ``f˜†€†€æ€˜€€€˜˜fxfž žæ†ø˜ffžfx €€€~˜

    What I did is this :
    I dropped the PC's speed from 115200 to 57600,and it worked without seeing funny characters.
    I have not touch the speed on the router side, I left it as it is.
    What be the case if I reduce the AUX's rooter speed ? When I tried to change it by doing this :
    Router2811#config line 1
    Router2811(config-line)#speed 56000
    Failed to ,,,,,,I do not remember right now
    Why it gave me failed error message !!!!!
    Thanks

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