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Customizing Line Protocols

3-33

Parameter: Transmission Interface

Default: DS3

Options: DS1

| DS3

Function: Speciﬁes 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. The HSSI driver 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.

Instructions: Select a DS1 MIB (speciﬁed by RFC 1232) or a DS3 MIB (speciﬁed by

RFC 1233) depending on the carrier services the attached DCE device

provides (DS1 at 1.54 MB/s or DS3 at 44.736 MB/s).

MIB Object ID: 1.3.6.1.4.1.18.3.4.7.1.13

Parameter: External Clock Speed

Default: 46359642 (44.736 MB/s)

Range: 307200 to 52638515

Function: Speciﬁes the bandwidth that the HSSI channel provides.

The HSSI speciﬁcation requires that the DCE provide a transmit clock

that times data transfer across the DTE/DCE interface. The value you set

for this parameter does not actually affect hardware initialization. Some

routing protocol software uses this parameter value for route selection.

Instructions: Enter a value equal or close to the data transmission rate across the HSSI.

MIB Object ID: 1.3.6.1.4.1.18.3.4.7.1.14

Parameter: CRC Size

Default: 32 bit

Options: 16 bit

| 32 bit

Function: Speciﬁes an error detection scheme. You can choose either 16-bit

(standard ITU-T) or 32-bit (extended) to detect errors in the packet.

Instructions: Set this parameter to either 16-bit or 32-bit, making certain that the

remote end of the HSSI connection is conﬁgured for the same value.

MIB Object ID: 1.3.6.1.4.1.18.3.4.7.1.15

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Avaya Configuring Line Services Manual do Utilizador Página 81