Additional T1/E1 CSU parameters are available in the event it is necessary to fine-tune the T1/E1 interface to meet your application requirements.
CLI> set csu t1 or set csu e1
These parameters, along with their factory default settings, are shown below:
| T1 | E1 | Parameter | Description |
|---|---|---|---|
| X |
| B7Zero Suppression | This parameter applies to T1 only. It sets Bit 7 zero suppression to enable-b7zs or disable-b7zs. If set to enable, Bit 7 is forced to 1 if 8 consecutive zeros occur. Default = disable-b7zs. |
| X |
| B8Zero Suppression | This parameter applies to T1 only. It sets Bit 8 zero suppression to enable-b8zs or disable-b8zs. Default = enable-b8zs. |
| X | X | clockSource | This sets the T1/E1 CSU line clocking source to internal or external. Default = external. |
|
| X | crc 4 | This parameter applies to E1 only. It sets crc4, error checking, to enable or disable. Default = disable. |
| X | X | ds0BasicRate | This sets the T1 CSU line speed to a multiple of either 64K or 56K bits per second. (Note: For E1, this parameter should be set to 64K.) Default = 64K. |
| X | X | ds0Connection | This command is described in detail in Configurator Procedure for Configuring a T1 CSU or E1 CSU Interface. |
| X |
| frameFormat | This parameter applies to T1 only. It sets the T1 CSU frame format to d4FramingMode or esfFramingMode. Default = esfFramingMode. |
|
| X | hdb3 | This parameter applies to E1 only. If set to enable, it limits the maximum number of consecutive zeros in an HDB3-coded signal to three. Any four consecutive zeros are replaced with a pattern that includes a bipolar event (a pulse of the same polarity as the previous pulse without being part of the zero substitution code). Default = disable. |
| X |
| lineBuildOut | This selects the T1 CSU line buildout. Choices are as follows:
0-133-feet | 133-266-feet T1 default = -7.5 db. For E1csu, the line buildout is determined by the hardware. For example, if it is a 75 ohm (Coaxial cable connector) E1 csu, the line buildout will be 75-loss-1-1.36-step. This value is automatically set.
For a 120 ohm (RJ45 connector) E1 csu, the line buildout is 120-loss-1-1.36-step. This value is automatically set. |
| X |
| payLoadLoopback | This enables or disables the T1 CSU payload loopback testing. Default = disable. |
| X | X | remoteLoopback | This enables or disables the T1/E1 CSU remote loopback testing. Default = disable. |
| X | X | TrapStatus | This enables or disables the generation of T1/E1 CSU events and alarms traps messages. Default = enable. |
| X | X | TxIdleCode | This selects the T1/E1 CSU Idle Code. Valid values are integers between 0 and 255. The default settings differ between T1 and E1. T1 default = 127 (hex 0x7F). E1 default = 85 (hex 0x55). |
End of Topic
Configuring a 56k CSU Interface
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