T1/E1 port configuration task list
184
SmartWare Software Configuration Guide
15 • T1/E1 port configuration
The command has three other options that allow you to manually switch on/off different loops. All these addi-
tional options are applicable in T1 and E1 mode.
The ‘line-interface’ loop sends back the whole link bandwidth (2048kBit/s or 1544kBit/s).
In ‘payload’ the entire user data bandwidth (1984 kbps or 1536 kbps) is looped back.
For some tests it is helpful to loop back the system data. For example, system data are sent from the router to
the T1/E1 port. To switch on this feature the option ‘back-plane’ must be selected.
Mode: port e1t1 <slot> <port>
Configuring T1/E1 encapsulation
Only ‘hdlc’ encapsulation is available on a T1/E1 port. Once encapsulation is configured as ‘
hdlc
,’ the ‘hdlc’
submode can be entered for selecting the next encapsulation type like
ppp
or framerelay. Dependent on the
port-type, the encapsulation ‘hdlc’ selects automatically all timeslots of the port for data transmission (
1-31
for
e1 and
1-24
for t1).
It is also possible to use the port in
channelized
mode. In “channelized” mode, the user selects less than the
total number of timeslots for the channel (1-31 for E1, 1 – 24 for T1) is able to configure single or multiple
timeslots for data transmission. To use this feature the encapsulation must be configured for ‘channelized;’
afterwards the
channel-group
command is used to create the channel-group. In the channel-group configura-
tion mode, the user selects the specific timeslots, and the encapsulation ‘hdlc’ will be available again. Once the
encapsulation of a T1/E1 port is set to ‘channelized’ it is not possible to change the port-type again or to use
the ‘unframed’ framing format.
Mode: port e1t1 <slot> <port>
Create a Channel-Group
If the desired encapsulated channel uses only selected time slots (not the entire T1/E1), then it is necessary to
set up a channel-group. To create a channel-group, set the T1/E1 port’s encapsulation to channelized. (See sec-
tion
“Configuring T1/E1 encapsulation”
.) On creating a new channel-group the channel-group configuration
Step
Command
Purpose
1
[ name] (prt-e1t1)[slot/port]#[no] loop-back
{line-interface | back-plane | payload | auto-
detection}
Enables/Disables type of data loopback, line-inter-
face, payload, back-plane, or auto-detection.
Default: disabled
Step
Command
Purpose
1
[
name
] (prt-e1t1)[
slot/port
]#[no] encapsu-
lation {channelized | hdlc}
Specifies the encapsulation type of the T1/E1 port.
Default:
no encapsulation
