954 NTAK93D-channel Handler Interface daughterboard
The DCHI performs D-channel Layer 2 message processing and transfers
Layer 3 signaling information between two adjacent network switches. It is
mounted on the NTAK091.5 Mb DTI/PRI card or the NTBK50 2.0 Mb PRI
card (installed in the Media Gateway) using standoff reference pins and
connectors. The NTAK93 daughterboard, when mounted on the NTBK50
PRI digital trunk card, is addressed in the same slot as the NTBK50. The
NTAK93daughterboard can use SDI I/O addresses 1 to 15 and port 1.
The NTAK93provides the following features and functions:
•D-channel interface or DPNSS interface
•Special features included for LAPD implementation at DCH:
— system parameters are service changeable (system parameters
are downloaded from software)
— incoming Layer 3 message validation procedures are implemented
in the D-PORT firmware
— supported message units and information elements can be service
changed
— translation of the CCITT message types information elements into a
proprietary coding scheme for faster CPU operation
— convention of IA5-encoded digits to BCD-encoded digits for incoming
Layer 3 messages forfaster CPU operation
— self-test
— loopback
NTAK93provides the following features and functions:
•D-channel or DPNSS interface
•special features included for LAPD implementation at DCH:
— system parameters are service changeable (system parameters
are downloaded from software)
— incoming Layer 3 message validation procedures are implemented
in the D-PORT firmware
— supported message units and information elements may be service
changed
— translation of the CCITT message types information elements into a
proprietary coding scheme for faster CPU operation
— convention of IA5-encoded digits to BCD-encoded digits for incoming
Layer 3 messages forfaster CPU operation
— self-test
— loopback
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.