04-20-2006 01:10 PM - edited 03-03-2019 12:27 PM
I have a vwic-MFT-1T1 connected to a PRI from Verizon. T1 is down, Verizon has tested and they believe line is working fine. I can see a lot of LCV and PCV. No alarms.
What exacly a loopback diag do? is it a local loop or remote?
I have a diag loopback on my T1 controller and I ran BERT test. The results are:
T1 0/0/0 is up. (Diagnostic Loopback)
BERT is done on the controller. The result of last time is
DSX1 BERT status : done
DSX1 BERT pattern : QRSS
DSX1 BERT sync count : 13
DSX1 BERT interval : 1 min
DSX1 BERT time remain : 0 min 0 sec
DSX1 BERT total errs : 81
DSX1 BERT total k bits: 77970
DSX1 BERT errors (last): 0
DSX1 BERT k bits (last): 3282
Does it mean a problem in the line? is it looped up to x-demarc? up to demarc/smart jack? up to remote?
Any ideas?
Thanks!
04-20-2006 03:08 PM
Problem appears to be with the vwic. Loopback diag is local to the box i.e looped up to the CSU/DSU.
You might want to try reloading the router as I have seen reload clear problems with vwic.
Pls. rate all helpful posts.
HTH,
Sundar
04-20-2006 03:28 PM
I have reloaded the server many times. It didnt fix it. So loopback diag means it loops the PRI link towards the router? bits never leave the VWIC port if it's in loopback diag?
If i physically disconnect the link from the port, I'll get the same results with loopback diag?
Thanks!
04-20-2006 03:33 PM
Yes, that's correct.
I am afraid you would have to replace the VWIC.
--Sundar
04-20-2006 03:43 PM
Some more debug info:
#loopback diag
Apr 20 23:36:41.370: %CONTROLLER-5-UPDOWN: Controller T1 0/0/0, changed state to
up
Apr 20 23:36:41.370: ISDN Se0/0/0:23 SERROR: service_queue_from_physical_layer:
got ISDN_PH_ACT_IND on an active interface?
Apr 20 23:36:41.370: ISDN Se0/0/0:23 Q921: L2_EstablishDataLink: sending SABME
Apr 20 23:36:41.374: ISDN Se0/0/0:23 Q921: User TX -> SABMEp sapi=0 tei=0
Apr 20 23:36:41.374: ISDN Se0/0/0:23 Q921: User RX <- BAD FRAME(0x00017F)
Apr 20 23:36:42.370: ISDN Se0/0/0:23 Q921: User TX -> SABMEp sapi=0 tei=0
Apr 20 23:36:42.370: ISDN Se0/0/0:23 Q921: User RX <- BAD FRAME(0x00017F)
Apr 20 23:36:43.370: ISDN Se0/0/0:23 Q921: User TX -> SABMEp sapi=0 tei=0
Apr 20 23:36:43.374: ISDN Se0/0/0:23 Q921: User RX <- BAD FRAME(0x00017F)
Apr 20 23:36:44.370: ISDN Se0/0/0:23 Q921: User TX -> SABMEp sapi=0 tei=0
Apr 20 23:36:44.370: ISDN Se0/0/0:23 Q921: User RX <- BAD FRAME(0x00017F)
Apr 20 23:36:45.370: ISDN Se0/0/0:23 Q931: Ux_DLRelInd: DL_REL_IND received from
L2
04-20-2006 04:15 PM
I think you're right and the brand new VWIC is the problem. Just to make sure, can you tell me if this config is correct?
I have a 2811 with 12.4.4XC1 and PVDMs for only 16 channels...
network-clock-participate wic 0
!
isdn switch-type primary-ni
!
voice-card 0
no dspfarm
!
controller T1 0/0/0
framing esf
linecode b8zs
cablelength short 133
pri-group timeslots 1-16,24
!
interface Serial0/0/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn incoming-voice voice
isdn send-alerting
no cdp enable
!
voice-port 0/0/0:23
!
04-20-2006 04:29 PM
Looks good to me.
Pls. rate all helpful posts.
HTH,
Sundar
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: