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Community Member

wic-1dsu-t1 alarm light

I have a fractional T1 line, but my ISP has not given me any IP addresses or gateway info. So I don't know if my T1 line works.

The alarm (AL) on my wic is amber. The CD light is green. I think the wic is good because of these messages:

Cisco Internetwork Operating System Software

IOS (tm) C1700 Software (C1700-Y-M), Version 12.2(6), RELEASE SOFTWARE (fc2)

Copyright (c) 1986-2001 by cisco Systems, Inc.

Compiled Thu 08-Nov-01 05:42 by pwade

Image text-base: 0x800080E0, data-base: 0x806EB320

cisco 1720 (MPC860) processor (revision 0x301) with 13927K/2457K bytes of memory


Processor board ID JAD03251534 (618961610), with hardware revision 0000

M860 processor: part number 0, mask 32

Bridging software.

X.25 software, Version 3.0.0.

1 FastEthernet/IEEE 802.3 interface(s)

1 Serial network interface(s)


32K bytes of non-volatile configuration memory.

4096K bytes of processor board System flash (Read/Write)

00:00:05: SERVICE_MODULE(Serial0): self test finished: Passed

Should I wait until my ISP gives me some IP addresses and routing info first before worrying?

Community Member

Re: wic-1dsu-t1 alarm light

just to respond to your 'Alarm' amber light. This indicates you have a connection. Only if it shows red do you have to start worrying about either the csu/dsu or their box. Hope this helps a little

Community Member

Re: wic-1dsu-t1 alarm light

One thing you could do to see if your fractional T1

is up, and do a show int serial x, x= serial port that is connected to the circuit.

from router config mode:

router # clear int serial x

router # show int serial x

if serial x up, line protocol up, then layer 1 & 2

is up. keep doing the command, and see if there are any input errors. If 0 input errrors, and you're getting keepalive packets back, then your ckt is good to go.

Once you get your ip addresses, you should have full connectivity.

regards, Philippe

Community Member

Re: wic-1dsu-t1 alarm light


Probably a little late for you to use, but may be of some use for future reference :-

When trying to determine if a T1 controller is healthy, the best way is to use an external pyhsical test, such as a loopback plug as this will test the "whole" card and the dsu. To do this simply follow the instructions in the URL below :-

Hope it helps.

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