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. If necessary, complete steps 1 through 5 of Configurator Procedure for Setting the DS0 Connection.
See the table below for a description of optional T1/E1 CSU parameters:
| Parameter | T1 | E1 | Description |
|---|---|---|---|
| B7Z | X |
| 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. |
| B8Z | X |
| This parameter applies to T1 only. It sets Bit 8 zero suppression to enable-b8zs or disable-b8zs. Default = enable-b8zs. |
| Clock Source | X | X | This sets the T1/E1 CSU line clocking source to internal or external. Default = external. |
| CRC 4 |
| X | This parameter applies to E1 only. It sets crc4, error checking, to enable or disable. Default = disable. |
| Basic Rate | X | X | 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. |
| DS0 Connection | X | X | This command is described in detail in Configurator Procedure for Configuring a T1 CSU or E1 CSU Interface. |
| Frame Format | X |
| This parameter applies to T1 only. It sets the T1 CSU frame format to d4FramingMode or esfFramingMode. Default = esfFramingMode. |
| hdb3 |
| X | 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. |
| Line Build Out | X |
| 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. |
| Payload Loopback | X |
| This enables or disables the T1 CSU payload loopback testing. Default = disable. Currently not implemented on the Passport 4400. |
| Remote Loopback | X | X | This enables or disables the T1/E1 CSU remote loopback testing. Default = disable. |
| Trap | X | X | This enables or disables the generation of T1/E1 CSU events and alarms traps messages. Default = enable. |
| Idle Code | X | X | 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). |
After you have completed inputting the parameters, click Save. A "Command Successful" appears.
End of Procedure
Configuring a 56k CSU Interface
CLI Commands for Configuring a T1 CSU or E1 CSU Interface
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