Avaya Configuring Line Services Manual do Utilizador Página 92

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Customizing WAN Interfaces
114078 Rev. A 4-15
The HSSI driver enables the DS1 MIB by default, but provides no support for
either the DS1 or DS3 MIB. Rather, the external DCE (for example, a DL3200
SMDS CSU/DSU from Digital Link) may provide MIB support.
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 Speedparameters
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.
Site Manager: Transmission Interface parameter: page A-30
Site Manager: External Clock Speed parameter: page A-31
Site Manager: CRC Size parameter: page A-31
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