R3303-HP HSR6800 Routers Interface Configuration Guide

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Configuring a CT3 interface
Both T3 and T1 belong to the T-carrier system promoted by ANSI. T3 uses the digital signal level DS-3
and operates at 44.736 Mbps.
CT3 interfaces support two operating modes: T3 (unchannelized) and CT3 (channelized).
• In T3 mode, a CT3 interface is a synchronous serial interface with 44.736 Mbps of data bandwidth,
on which no timeslots are divided.
• In CT3 mode, a CT3 interface can be demultiplexed into 28 channels of T1 signals. Each T1 line
can be divided into 24 timeslots numbered 1 through 24. Different from E1, each line on a T1
interface can operate at either 64 kbps or 56 kbps. Therefore, the number of logical lines that can
be created on a CT3 interface in CT3 mode is either M × 1.536 Mbps (where M ranges from 1 to
28) or N × 56 kbps or N x 64 kbps (where N ranges from 1 to 300).
When a T1 line is working in unframed (T1) mode, the system automatically creates a serial interface
named serial number/line-number:0 for it. This interface operates at 1544 kbps and is logically
equivalent to a synchronous serial interface where you can make other configurations.
When the T1 line is working in framed (CT1) mode, you can bundle timeslots on it. The system
automatically creates a serial interface named serial number/line-number:set-number for it. This
interface operates at N × 64 kbps or N × 56 kbps and is logically equivalent to a synchronous serial
interface where you can make other configurations.
Configuring a CT3 interface in T3 mode
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter CT3 interface view.
controller t3 interface-number N/A
3. Configure the interface to
operate in T3 mode.
using t3
The default operating mode is CT3
mode.
4. Enable FT3 mode and set the
DSU mode or the subrate.
ft3 { dsu-mode { 0 | 1 | 2 | 3 | 4 }
| subrate number }
Optional.
By default, DSU mode 0 (the digital
link mode) is adopted, and the
subrate is 44210 kbps.
5. Set other interface
parameters.
See "Configuring other CT3
interface parameters."
Optional.
Serial interfaces created on CT3 interfaces support PPP, HDLC, and FR at the data link layer, and IP at the
network layer. Configure link layer protocols, and IP address for the CT3 interface if the network requires.
Configuring a CT3 interface in CT3 mode
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter CT3 interface view.
controller t3 interface-number N/A