Configuring high speed links (HSL)

High speed links (HSL) meet the ANSI T1.111-1996 and Q.703/Annex A standards. Each HSL occupies a full (unchannelized) T1/E1 line and transfers data at the rate of 2.0 (1.544) Mbps.

Parameters

Configuring high speed links in MTP uses two parameters, HS_LINK and HS_EXT_SEQ, which are contained in the Link section of the configuration file. The following table describes these parameters:

Parameter

Description

HS_LINK

Setting this parameter to TRUE, notifies MTP that high speed links are in effect and automatically sets HS_EXT_SEQ to TRUE.

Set HS_EXT_SEQ to FALSE for high speed links with normal sequence numbers.

HS_EXT_SEQ

Setting this parameter to TRUE, notifies MTP that extended sequence numbers are in effect and changes the size of:

  • FSN, BSN, and LI fields in MTP 2 packets

  • The last FSN field of COO and COA messages at layer 3

Sequence numbers increase from 7 to 12 bits and the length indicator increases from 6 to 8 bits.

Setting HS_EXT_SEQ to TRUE automatically sets HS_LINK to TRUE. Normal speed links with extended sequence numbers are not supported.


A combination of high speed and normal speed links is not supported.

High speed link configuration example

The following sample configuration file shows the configuration for high speed links:

#------------------------------------------------
# Link Parameters
#------------------------------------------------
LINK               0          #  Link number specified in MTPMGR commands
PORT               T1         #  T<n> for T1/E1, R for remote
HS_LINK            TRUE
HS_EXT_SEQ         TRUE
LINK_SET           1
LINK_TYPE          ANSI       #  ANSI / ITU / JNTT / JTTC
ADJACENT_DPC       1.1.2      #  Board 2
LINK_SLC           0
LSSU_LEN           2
SSF                NATIONAL   # NATIONAL / INTERNATIONAL
END