cisco 2921 command issue

[gavin han]

Hi,

I'm trying to configure following commands on 2921 router

controller T1 0/0/0
framing esf
linecode b8zs

but config. only shows

controller T1 0/0/0

cablelength long 0db

why is that? will there be any issue?

[phooghen · Accepted solution]

What's the output of "Show controller t1 0/0/0"

Maybe thedefault settings are:

framing esf
linecode b8zs

[gavin han]

yeah looks like they are default settings:

T1 0/0/0 is down.
  Applique type is Channelized T1
  Cablelength is long 0db
  Transmitter is sending remote alarm.
  Receiver has loss of signal.
  alarm-trigger is not set
  Soaking time: 3, Clearance time: 10
  AIS State:Clear  LOS State:Clear  LOF State:Clear
  Version info Firmware: 20100222, FPGA: 13, spm_count = 0
  Framing is ESF, Line Code is B8ZS, Clock Source is Line.
  CRC Threshold is 320. Reported from firmware  is 320.

what does " cablelength long 0db" do? router took it by default.

[phooghen]

From the command reference guide:

Router(config-controller)# cablelength long {-15db |  -22.5db | -7.5db | 0db}

T1/E1 interfaces only)  Configures the cable length. The cable length setting must conform to  the actual cable length you are using. For example, if you attempt to  enter the cablelength short command on a long-haul T1 link, the command is rejected.

To set a cable length longer than 600 feet for a T1 link, use the cablelength long command. The keywords are as follows:

•-15db specifies the decibel pulse level at -15 dB.

•-22.5db specifies the decibel pulse level at -22.5 dB.

•-7.5db specifies the decibel pulse level at -7.5 dB.

•0db specifies the decibel pulse level at 0 dB. This is the default pulse rate.

[gavin han]

Hi,

could you please advise what db value should I select.

#

•-15db specifies the decibel pulse level at -15 dB.

#

•-22.5db specifies the decibel pulse level at -22.5 dB.

#

•-7.5db specifies the decibel pulse level at -7.5 dB.

#

•0db specifies the decibel pulse level at 0 dB. This is the default pulse rate.