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New Member

What is correct cable between Nortel Option 81C and Cisco gateway

We are trying to establish QSIG connections between our Nortel Option 81C and Cisco 3845.

We are able to get layer 1 "active" ( shows via show ISDN status).

But layer 2 ISDN will not establish (keeps going between TEI_ASSIGNED and AWAITING_ESTABLISHMENT).  Nortel guys say their side is setup correctly.

I want to get back to basics and make sure the cable is correct.  What we have  connected on Nortel T1 port is a DA-15 which on the rear side has interface for RJ connection.  From the rear of that DA-15 we have a T1 cross-over cable (i..e in rear of DA-15 pins 1,2, 4,5 and other end connecting into T1 port on 3845 is pins 4,5 1,2).  We validated with Cable tester that pins are crossed.

Is this the correct cabling?  We tried at first just straight through, and could not establish layer 1.  As soon as we connected with above, layer 1 established (but not layer 2).


Thanks in advance,

Regards,

7 REPLIES
New Member

Re: What is correct cable between Nortel Option 81C and Cisco ga

More info, output from debug isdn Q921.

Feb 27 12:25:37.414: ISDN Se0/1/0:23 Q921: L2_EstablishDataLink: sending SABME
Feb 27 12:25:37.414: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Feb 27 12:25:38.414: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
router#
Feb 27 12:25:39.414: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Feb 27 12:25:40.414: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
router#
Feb 27 12:25:42.286: ISDN Se0/0/0:23 Q921: Net TX -> RRp sapi=0 tei=0 nr=42
Feb 27 12:25:42.290: ISDN Se0/0/0:23 Q921: Net RX <- RRf sapi=0 tei=0 nr=40
router#
Feb 27 12:25:47.434: ISDN Se0/1/0:23 Q921: L2_EstablishDataLink: sending SABME
Feb 27 12:25:47.434: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Feb 27 12:25:48.434: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Router#
Feb 27 12:25:49.434: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Feb 27 12:25:50.434: ISDN Se0/1/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Router#

Hall of Fame Super Gold

Re: What is correct cable between Nortel Option 81C and Cisco ga

Set isdn protocol-emulate network.

New Member

Re: What is correct cable between Nortel Option 81C and Cisco ga

I have that input already.

i setup a T1 cross to seperate cisco CME router .  Layer 2 and 3 came up without issue, making calls between these gateways.

I believe it's a cabling issue, not sure what cable I need (DB15 to rj45 T1 crossover or straightthrough)???

Nortel T1 port (db15 connector into T1 port, other side of db15 connector is rj interface).  From there I have to go to a pach panel under the floor, which connect to another patch panel on other side of data center.  Then on this far side patch panel, I patch from this far side patch panel into gateway T1 port.

Nortel DB15/RJ45 - to patch panel - runs to another patch panel - rj45 cable over to gateway T1 port.

What is correct cable ?

Regards,

Hall of Fame Super Gold

Re: What is correct cable between Nortel Option 81C and Cisco ga

Have you set clock internal? Send show controllers T1.

You need to respect pairing, that is make sure TX pair use an ethernet pair and same for TX.

New Member

Re: What is correct cable between Nortel Option 81C and Cisco ga

Below is output.

Regardless if you think there is issues on the config side( which I can't say 100% there isn't), can you please let me know the exact cabling I need between Nortel (which has DB15 Femail Interface for T1) and Cisco side.  Link below leads me to believe I need DB15-RJ48 T1 cross-over (or DB15-RJ48 straightthrough)?  I want to at least ensure I have proper cabling.

http://www.chebucto.ns.ca/Chebucto/Technical/Manuals/Max/max6000/gs/cables.htm#17533

controller T1 0/1/0
clock source internal
pri-group timeslots 1-24
!

network-clock-participate wic 0
network-clock-select 1 t1 0/1/0

!

interface Serial0/1/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-qsig
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable

!

show isdn status

ISDN Serial0/1/0:23 interface
        dsl 1, interface ISDN Switchtype = primary-qsig
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = AWAITING_ESTABLISHMENT
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Active dsl 1 CCBs = 0
    The Free Channel Mask:  0x807FFFFF
    Number of L2 Discards = 0, L2 Session ID = 2

show controller t1 0/1/0

T1 0/1/0 is up.
  Applique type is Channelized T1
  Cablelength is short 110
  No alarms detected.
  alarm-trigger is not set
  Soaking time: 3, Clearance time: 10
  AIS State:Clear  LOS State:Clear  LOF State:Clear
  Version info Firmware: 20071011, FPGA: 13, spm_count = 0
  Framing is ESF, Line Code is B8ZS, Clock Source is Internal.
  CRC Threshold is 320. Reported from firmware  is 320.
  Data in current interval (642 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     46 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     46 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 84 Unavail Secs
  Data in Interval 1:
     0 Line Code Violations, 0 Path Code Violations
     84 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     84 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 2:
     0 Line Code Violations, 0 Path Code Violations
     82 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     82 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 3:
     0 Line Code Violations, 0 Path Code Violations
     84 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     84 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 4:
     0 Line Code Violations, 0 Path Code Violations
     84 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     84 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Data in Interval 5:
     0 Line Code Violations, 0 Path Code Violations
     84 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     84 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Thanks and I will be sure to Rate.

Regards,

Hall of Fame Super Gold

Re: What is correct cable between Nortel Option 81C and Cisco ga

As mentioned above.

You need to respect pairing in T1 cabling going to Ethernet cabling.

Both pinouts are available everywhere.

New Member

Re: What is correct cable between Nortel Option 81C and Cisco ga

Would you post the DB15 pinout that you got working with the T1 crossover cable?

Thanks,

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