Specifications

Configure a Channelized T3 Interface Processor
IC-80
Cisco IOS Interface Configuration Guide
As mentioned above, the CT3IP or PA-CT3/4T1 provides 28 T1 channels for serial transmission of
data. Each T1 channel can be configured to use a portion of the T1 bandwidth or the entire T1
bandwidth for data transmission. Bandwidth for each T1 channel can be configured for n x 56 kbps
or n x 64 kbps (where n is 1 to 24). The unused portion of the T1 bandwidth, when not running at
full T1 speeds, is filled with idle channel data. The CT3IP or PA-CT3/4T1 does not support the
aggregation of multiple T1 channels (called inverse muxing or bonding) for higher bandwidth data
rates.
The first three T1 channels of the CT3IP or PA-CT3/4T1 can be broken out to the three DSUP-15
connectors on the CPT3IP or PA-CT3/4T1 so the T1 can be further demultiplexed by the MIP on the
same router or on another router or by other multiplexing equipment. When connecting to the MIP,
you configure a channelized T1 as described in the “Configure External T1 Channels” section later
in this chapter. This is referred to as an external T1 channel.
The CT3IP supports RFC 1406 and RFC 1407 (CISCO-RFC-1407-CAPABILITY.my). For
information about Cisco MIBs, refer to the current Cisco IOS release note for the location of the
Management Information Base (MIB) online reference.
For RFC 1406, Cisco supports all tables except the “Frac” table. For RFC 1407, Cisco supports all
tables except the “FarEnd” tables.
The CT3IP supports the following WAN protocols:
Frame Relay
HDLC
PPP
SMDS Data Exchange Interface (DXI)
The CT3IP meets ANSI T1.102-1987 and BELCORE TR-TSY-000499 specifications for T3 and
meets ANSI 62411 and BELCORE TR499 specifications for T1. The CT3IP provides internal CSU
functionality and includes reporting performance data statistics, transmit and receive statistics, and
error statistics. The CT3IP supports RFC 1406 (T1 MIB) and RFC 1407 (T3 MIB).
External T1 channels do not provide CSU functionality and must connect to an external CSU.
The CT3IP supports RFC 1406 (T1 MIB) and RFC 1407 (T3 MIB).
Channelized T3 Configuration Task List
Perform the tasks in the following sections to configure the CT3IP (all tasks are optional except for
the second task):
Configure the T3 Controller
Configure Each T1 Channel
Configure External T1 Channels
Troubleshoot the T3 and T1 Channels
Loopback T1 Channels
Loopback T3 Lines
Monitor and Maintain the CT3IP
Configure Maintenance Data Link Messages
Enable Performance Report Monitoring