Specifications
Configure the T3 Controller
Configuring Serial Interfaces IC-81
• Enable BERT Test Pattern
• Enable Remote FDL Loopbacks
After you configure the T1 channels on the CT3IP, you can continue configuring it as you would a
normal serial interface. All serial interface commands might not be applicable to the T1 channel. For
more information, see the “Configure a Synchronous Serial Interface” section earlier in this chapter.
For CT3IP configuration examples, see the “Channelized T3 Interface Processor Configuration
Examples” section, later in this chapter.
Configure the T3 Controller
If you do not modify the configuration of the CT3IP, the configuration defaults shown in Table 5 are
used.
If you must change any of the default configuration attributes, use the first command in global
configuration mode followed by any of the optional commands in controller configuration mode:
Note The port adapter and port numbers for the CT3IP are 0.
Note Although you can specify a cable length from 0 to 450 feet, the hardware only recognizes two
ranges: 0 to 224 and 225 to 450. For example, entering 150 feet uses the 0 to 224 range. If you later
change the cable length to 200 feet, there is no change because 200 is within the 0 to 224 range.
However, if you change the cable length to 250, the 225 to 450 range is used. The actual number you
enter is stored in the configuration file.
Configure Each T1 Channel
You must configure the timeslots used by each T1 channel on the CT3IP. Optionally, you can specify
the speed, framing format, and clock source used by each T1 channel. If you do not specify the
speed, framing format, and clock source used by each T1 channel, the configuration defaults shown
in Table 6 are used.
Table 5 CT3IP Controller Defaults
Attribute Default Value
Framing auto-detect
Cable length 224 feet
Clock source internal
Command Purpose
controller t3 slot/port-adapter/port Select the CT3IP and enter controller configuration
mode.
framing {c-bit | m23 | auto-detect} Change the framing format.
cablelength feet Change the cable length (values are 0 to 450 feet).
clock source {internal | line} Change the clock source used by the T3 controller.