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
