R0106-HP MSR Router Series Interface Configuration Guide(V7)

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• In T3 mode, a CT3 interface is a synchronous serial interface with 44.736 Mbps of data bandwidth.
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. Each line on a T1 interface can operate
at either 64 kbps or 56 kbps.
The following are schemes available for creating different rates of T1 lines on a CT3 interface in CT3
mode, as follows:
• M × 1.536 Mbps (M is an integer in the range of 1 to 28.)
• N × 56 kbps or N x 64 kbps (N is an integer in the range of 1 to 300.)
A T1 line can operate in T1 or CT1 mode:
• When the T1 line is operating in unframed (T1) mode, the system automatically creates a
1544-kbps serial interface named serial number/line-number:0 for it.
• When the T1 line is operating in framed (CT1) mode, you can bundle timeslots on it. The system
automatically creates a synchronous serial interface named serial number/line-number:set-number
for it. This interface operates at n × 64 kbps or n × 56 kbps, where n is the number of bundled
timeslots.
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. (Optional.) Configure the
interface to operate in the FT3
mode and set the DSU mode or
the subrate.
ft3 { dsu-mode { 0 | 1 | 2 | 3 | 4 }
| subrate number }
By default, DSU mode 0 (the digital
link mode) is adopted, and the
subrate is 44210 kbps.
5. (Optional.) Configure the
interface description.
description text
Optional.
By default, the description of an
interface is interface-name
Interface.
6. Set the clock mode.
clock { master | slave }
The default clock mode for the CT3
interface is slave, which is line
clock.
7. Set the cable length.
cable feet
The default is 14.9 meters (49
feet).
8. Set the framing format for the
CT3 interface.
frame-format { c-bit | m23 }
By default, the framing format on
the CT3 interface is C-bit.
9. (Optional.) Set the loopback
mode.
loopback { local | payload |
remote }
By default, loopback is disabled.
10. (Optional.) Configure alarm
signal detection/sending.
alarm { detect | generate { ais |
febe | idle | rai } }
By default, alarm detection is
enabled and alarm sending is
disabled.
11. (Optional.) Start a BERT test.
bert pattern { 2^7 | 2^11 | 2^15
| qrss } time number [ unframed ]
By default, BERT test is disabled.