
Configuring Line Services
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Setting the External Clock Speed
The HSSI specification requires that the DCE provide a transmit clock that times
data transfer across the DTE/DCE interface. The External Clock Speed parameter
specifies the bandwidth that the HSSI channel provides.
The External Clock Speed value does not actually affect hardware initialization.
Some routing protocol software uses this parameter value for route selection.
You can set the external clock speed to a rate from 307200 through 52638515
bytes per second.
Select a value equal or close to the data transmission rate across the HSSI. By
default, the HSSI clock rate is 46359642 (44.736 MB/s).
Setting the CRC Size
CRC size specifies an error detection scheme. You can choose either 16-bit
(standard ITU-T) or 32-bit (extended) to detect errors in the packet. The remote
end of the HSSI connection must be configured for the same CRC size.
You can set the CRC Size for this HSSI interface.
Editing T1 Lines
The following sections describe how to change the default settings for T1
interfaces:
• Enabling or Disabling a T1 Line
• Setting the T1 Frame Type
• Enabling or Disabling Bipolar with 8-Zero Substitution
• Specifying the Physical Line Length
• Setting the Internal Clock Mode
Site Manager: External Clock Speed parameter: page A-31
Site Manager: CRC Size parameter: page A-31
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