2851 w NM-1CET1-PRI & PVDM2-12DM - Modem lines being marked "B" Bad

Unanswered Question
Mar 2nd, 2007

We recently setup a new 2851 router (IOS 12.4(11)T1) for remote dialup access. It has a ISDN PRI network module NM-1CE1T1-PRI and a 12 port Digital Modem Module (PVDM2-12DM) 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 0: PVDMII-12DM - HW Version 1, FPGA Version 2.11, NiOS Not Responding

Modem 0/322-0/333:

PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F

Firmware: V3.07

show modem csm (one line okay, other marked bad)

Modem 0/327, line 327 (digital)

CSM status(0): CSM_STATUS_UNLOCKED

CSM current state(0x00000000): IDLE_STATE

CSM last event: ASYNC_DTR_UP, cause: 0x0000

wdt timer is not activated

invalid_events 0, wdt_timeouts 0

ic_failure 0, ic_complete 1, oc_failure 0, oc_complete 0

oc_busy 0, remote_link_disc 1, busyout 0, modem_reset 0

call started 00:58:37, call ended 01:07:10, total modem active time 00:08:33

tty_hwidb 0x47F02120, modem_tty 0x47F00FDC, modem_pool 0x477E712C

total pri d-channels 0, last used pri d-channel 0

total_free_rbs_timeslot 7, total_busy_rbs_timeslot 24, min_free_modem_threshold 6

Modem 0/328, line 328 (digital)

CSM status: MODEM_INTERNAL_BAD

CSM current state(0x00000009): BAD_STATE

CSM last event: WDT_TIMEOUT, cause: 0x0000

wdt timer is not activated

invalid_events 0, wdt_timeouts 2

ic_failure 1, ic_complete 0, oc_failure 0, oc_complete 0

oc_busy 0, remote_link_disc 1, busyout 0, modem_reset 0

call started 17:30:22, call ended 17:42:36, total modem active time 00:12:14

tty_hwidb 0x486DF1E0, modem_tty 0x486DE09C, modem_pool 0x477E712C

total pri d-channels 0, last used pri d-channel 0

total_free_rbs_timeslot 7, total_busy_rbs_timeslot 24, min_free_modem_threshold 6

sh running-config

network-clock-participate slot 1

network-clock-select 1 T1 1/0

modem country v12 usa

controller T1 1/0

framing esf

linecode b8zs

cablelength short 110

ds0-group 0 timeslots 1-24 type e&m-immediate-start

ds0 busyout 13-24

interface Group-Async0

ip unnumbered GigabitEthernet0/0

ip access-group 101 in

ip directed-broadcast

encapsulation ppp

ip tcp header-compression

no ip mroute-cache

timeout absolute 60 0

async mode interactive

group-range 0/322 0/333

line 0/322 0/333

absolute-timeout 90

modem Dialin

modem autoconfigure discovery

transport input all

autoselect ppp

Can anyone advise on what may be creating this problem and propose a solution? Thanks in advance for your help. -Paul

I have this problem too.
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