R3303-HP 6600/HSR6600 Routers Interface Configuration Guide

37
Task Command Remarks
Display the status of an E1-F
interface.
display interface serial interface-number [ |
{ begin | exclude | include } regular-expression ]
Available in any
view.
Configuring a T1-F interface
T1-F interfaces, fractional T1 interfaces, are simplified CT1 interfaces. They are a cost-effective alternative
to CT1 interfaces where T1 access does not need multiple channel sets.
A T1-F interface operating in framed mode can bind timeslots into only one channel set. A CT1 interface
can group and bundle timeslots randomly into multiple channel sets.
A T1 line is multiplexed from 24 channels. A T1 primary group frame DS1 (digital signal level-1)
comprises 24 DS0 (64 kbps) timeslots and 1 framing bit for synchronization, with each timeslot being 8
bits. Each primary group frame has 193 bits (24 × 8+1). As DS1 can transmit 8000 frames per second,
its transmission speed is 1544 kbps (193 × 8 kbps).
A T1-F interface can only operate in framed mode. Timeslots 1 through 24 on it can randomly form a
channel set. The rate of the interface is n × 64 kbps or n × 56 kbps and its logical features are the same
as those of a synchronous serial interface where you can configure PPP, HDLC, and FR at the data link
layer and IP at the network layer.
To configure a T1-F interface:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter T1-F interface view.
interface serial interface-number N/A
3. Configure the interface
description.
description text
Optional.
By default, the description of an
interface is interface-name
Interface.
4. Bundle timeslots on the
interface into a channel set.
ft1 timeslot-list list [ speed { 56k |
64k } ]
If no timeslot range is specified, all
timeslots are bundled into one
channel set.
The default timeslot speed is 64
kbps, and the default T1-F interface
speed is 1536 kbps.
5. Set the cable length and
attenuation.
ft1 cable { long decibel | short
length }
Optional.
The long 0db keyword applies by
default.
6. Set the line code format.
ft1 code { ami | b8zs }
Optional.
The default is B8ZS.
7. Set the clock mode.
ft1 clock { master | slave }
Optional.
The default is slave, which is line
clock.
8. Enable user data inversion.
ft1 data-coding { inverted |
normal }
Optional.
Disabled by default.