T1/E1 port configuration task list
183
SmartWare Software Configuration Guide
15 • T1/E1 port configuration
Configuring T1/E1 LOS threshold
This command takes effect only if the T1/E1 port is configured for
long-haul
applications. It specifies the sen-
sitivity for
Loss Of Signal threshold
. A signal suffers more attenuation over long distances than over short dis-
tances. Therefore the LOS-Threshold must be set higher for longer transmission distances. This command has
a default value of -46dB what should be enough for distances up to 1600 m/5250 ft.
Mode: port e1t1 <slot> <port>
Configuring E1/T1 Loopback detection
In T1 mode the E1/T1 interface module has the capability for autodetection of inband sent loopback codes.
Once a loopback-up code is detected, the module automatically enables the proper loopback function and dis-
ables it a soon as the corresponding loopback-down code appears. This feature is used by carrier equipment for
testing the line to the customer. It sends the loopback-up code to the customer device, then subsequently
starts, for example, a Pseudo Random Bit Sequence (PRBS) to determinate the quality of the connection.
.
Depending on the configured T1 framing, the right loopback code detection mode will be enabled as soon as
the command
loop-back auto-detection
will be executed. For framing type uses a different loop-
back code detection mechanism:
•
ESF: The loopback codes are transmitted via the 4kBit/s EOC-Channel, that is part of the 8kBit/s F-Bit
Channel. The following codes are supported:
•
SF and Unframed: An inband loop code pattern is sent for at least 5 seconds in all 24 timeslots. The follow-
ing codes are supported:
Step
Command
Purpose
1
[
name
] (prt-e1t1)[
slot/port
]#los-thresh-
old {-4dB | -6dB | -8dB … -46dB | -
48dB}
Specifies Loss Of Signal Threshold
Default:
-46dB
Command
Binary Code
Line Loopback Activate
0 000111 0
Line Loopback Deactivate
0 011100 0
Payload Loopback Acti-
vate
0 001010 0
Payload Loopback Deacti-
vate
0 011001 0
Universal Loopback Deac-
tivate
0 010010 0
Loopback Retention
0 010101 0
Command
Binary RepetitionCode
Line Loopback Activate
00001
Line Loopback Deactivate
001
