
Configuring WAN Line Services
5-4 117021-A Rev. A
Viewing the Configured WAN Protocol
You can view which WAN protocol is enabled on a HSSI circuit. However, do not
change the current value.
Setting the Transmission Interface
You can select the appropriate MIB for the local management interface (LMI) to
use, providing you enable LMI and configure SMDS or Frame Relay across the
HSSI interface. Select one of the following MIBs, depending on the carrier
services that the attached DCE device provides:
• DS1, at 1.54 MB/s (specified by RFC 1233)
• DS3, at 44.736 MB/s (specified by RFC 1232)
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 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.
Caution: Changing the WAN protocol does not reconfigure the interface, and
could disable it.
Site Manager: WAN Protocol parameter: page A-13
Site Manager: Transmission Interface parameter: page A-14
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