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JunosE 11.2.x Physical Layer Configuration Guide
HDLC Channel Configuration Tasks
crc
134
Specify the keyword test-signal to transmit test signals every second.
Example
host1(config-controll)#path 2 ds3 1 t1 28 fdl transmit path-id
Use the no version to disable transmission of the specified FDL message or all FDL
messages.
See path ds3 t1 fdl transmit.
Configuring Higher Layers
You must configure HDLC over the top layer of the T3 interface. See "HDLC Channel
Configuration Tasks" on page 134.
You must configure HDLC over the T3, T1, unframed E1, or fractional T1/E1 line that you
configure on an interface. As Figure 8 on page 109 shows, HDLC must be the top layer of
the interface stack.
To configure an HDLC channel, specify a serial interface. For example:
host1(config)#interface serial 4/0:1/1/1/1
Optional Tasks
The following configuration tasks are optional when you configure an HDLC channel on
a channelized T3 interface:
Configure the CRC.
Configure the HDLC idle character.
Enable data inversion on the interface.
Set the MRU.
Set the MTU.
Assign a text description or an alias to the serial interface.
Use to configure the size of the CRC.
Specify the number of bits (16 or 32) that are used to calculate the frame check
sequence (FCS). Both the sender and receiver must use the same setting.
The CRC is an error-checking technique that uses a calculated numeric value to detect
errors in transmitted data.
A 32-bit CRC should be used to protect longer streams at faster rates and, therefore,
provide better ongoing error detection.
Example
host1(config-if)#crc 32
Copyright © 2010, Juniper Networks, Inc.
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