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98 Crocus SHDSL G703 Chapter 5
User manual
Step-by-step configuration
5.9 Configuring the interface specific attributes
crocusShdslTtRpG703/g703/coding
Use the coding attribute to set the G703 interface encoding mode. Possible
values are:
Default:hdb3
Range: ami / hdb3
Value
ami
hdb3
Description
Alternate Mark Inversion is selected. This is a bipolar code with no zero substitution.
High Density Bipolar 3 is selected. This is a modified bipolar code.With HDB3
encoding, more than three consecutive zeroes occurring in the data are replaced
by a substitution word. This to ensure a high pulse density. Therefore, data links
using the HDB3 code can carry data patterns with a low 1 density. Most of the
G703 applications use HDB3 encoding.
crocusShdslTtRpG703/g703/crc4Insertion
This attribute is only relevant in framed mode.
Use the crc4Insertion attribute to determine whether the CRC-4 (cyclic redundancy check) is recalculated
before sending it to the interface. The CRC is used to check the data integrity on the G.703 connection.
The crc4Insertion attribute has the following possible values:
Default:auto
Range: enumerated, see below
Value
auto
disabled
enabled
Description
In auto mode, CRC-4 insertion is …·
• disabled if the data is unframed,·
• enabled if the data is G.704 framed.
CRC-4 insertion is disabled.
CRC-4 insertion is enabled.