Wic-1dsu-t1

I know this really isn't for CCNA exam, but can anyone help me in configuring T1's back-to-back. I know one side has to be configured for DCE, just like the serial cables, but I can never get them to communicate. I have searched a little on Cisco's website, but whenever I run through the tutorial I can never get it to come up.

Both the data link and physical sides are down... i know you must use a crossover cable to connect the two, which I am doing.

Since I'm fairly new to cisco/networking I'm sure I'm doing something wrong. Just a little point in the right direction is much appreciated.

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Comments

cyberguypr

Starting at physical layer, are you sure you have an actual T1 crossover cable? Pinout is NOT the same as a regular crossover cable.

MAC_Addy

cyberguypr wrote: »

Starting at physical layer, are you sure you have an actual T1 crossover cable? Pinout is NOT the same as a regular crossover cable.

That must be where I'm going wrong. I forgot that the T1's have a special cable. What are the pin outs for the T1 connection?

cyberguypr

There you go. Don't ask me how i know this.

jude56g

A little off topic, but I love T1.

MAC_Addy

I appreciate the reply! I fixed the cable. However, I still can't get connectivity between the two T1 cards. Here's the config from one device.

interface Serial0/0/0
ip address 192.168.10.2 255.255.255.252
encapsulation ppp
fair-queue
service-module t1 timeslots 1-24

I did add the service-module t1 clock source line, but it didn't show it in the sh running-config.

Here's the other end;

interface Serial0/0/0
description connected to Cisco2620
ip address 192.168.10.1 255.255.255.252
encapsulation ppp
fair-queue
service-module t1 clock source internal
service-module t1 timeslots 1-24

jude56g

MAC_Addy wrote: »

I appreciate the reply! I fixed the cable. However, I still can't get connectivity between the two T1 cards. Here's the config from one device.

interface Serial0/0/0
ip address 192.168.10.2 255.255.255.252
encapsulation ppp
fair-queue
service-module t1 timeslots 1-24

I did add the service-module t1 clock source line, but it didn't show it in the sh running-config.

Here's the other end;

interface Serial0/0/0
description connected to Cisco2620
ip address 192.168.10.1 255.255.255.252
encapsulation ppp
fair-queue
service-module t1 clock source internal
service-module t1 timeslots 1-24

Have a look at the output of show controllers, and see if there are any layer 1 issues remaining. See the bold sections below..

router#sh controllers t1
T1 1/0 is up.
Applique type is Channelized T1
Cablelength is short 133
Description: "T1 RIGHT"
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
RX level = 0dB
Framing is ESF, Line Code is B8ZS, Clock Source is Line.

MAC_Addy

Strange. Every time I type in sh controllers it's blank.

See below...

R3#sh controllers t1

R3#

cisco_trooper

MAC_Addy wrote: »

Strange. Every time I type in sh controllers it's blank.

See below...

R3#sh controllers t1

R3#

show controllers s0/0/0

MAC_Addy

That's what I thought, I tried that and didn't get too much information back in regards to what's wrong.

R3#sh controllers s0/0/0
Interface Serial0/0/0
Hardware is GT96K with Integrated FT1 CSU/DSU module
TX and RX clocks detected.
idb at 0x628A27B4, driver data structure at 0x628A9ED8
wic_info 0x628AA4DC
Physical Port 0, SCC Num 0
MPSC Registers:
MMCR_L=0x00030440, MMCR_H=0x00000000, MPCR=0x00000000
CHR1=0x00FE007E, CHR2=0x00000000, CHR3=0x0000064A, CHR4=0x00000000
CHR5=0x00000000, CHR6=0x00000000, CHR7=0x00000000, CHR8=0x00000000
CHR9=0x00000000, CHR10=0x0000000B
SDMA Registers:
SDC=0x00002201, SDCM=0x00000000, SGC=0x0000C000
CRDP=0x073BCEE0, CTDP=0x073BD120, FTDB=0x073BD120
Main Routing Register=0x0003FFC0 BRG Conf Register=0x00480000
Rx Clk Routing Register=0x76543288 Tx Clk Routing Register=0x76543219
GPP Registers:
Conf=0x43030002, Io=0x46064250, Data=0x6B7ABDA9, Level=0x8000020
Conf0=0x43030002, Io0=0x46064250, Data0=0x6B7ABDA9, Level0=0x8000020
0 input aborts on receiving flag sequence
0 throttles, 0 enables
0 overruns
0 transmitter underruns

cisco_trooper

show controllers s0/0/0 detail?

show int s0/0/0?

dtlokee

Show service-module serial 0/0/0

MAC_Addy

I'll try these tonight since I'm at work right now. I couldn't figure out what was going wrong on this so I decided to lab with my other serial cables.

drkat

just food for thought - any time you see the service-module you'll want to look at show service-module t1 - if it's a vwic then show controllers t1 is appropriate.

You do want to make sure linecode and framing is the same, along with your pin outs - looking at the configuration you should be OK the DTE/DCE is really for frame and not PPP

you can do remote loopbacks between the two to see if the controller changes states - with fixing the cable did it go up/down or still down/down

I'd also make a T1 Loopback plug just to check your controller cards

MAC_Addy

I did a loopback via command line and the lights changed to up. But via the WIC card it didn't change at all.

After I had corrected the cable it still showed as down/down.

I just made myself a couple of loopback plugs to test it out later.