Nortel Networks Circuit Card - Manual (Page 764)

Page 764 of 906 NTAK93 D-channel Handler Interface daughterboard
553-3001-211 Standard 3.00 August 2005
— 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 for faster CPU operation
— self-test
— loopback
Physical description
The DCH function can be installed in the main and IP expansion cabinets.
The DTI/PRI card which carries a DCH daughterboard resides in the main
and IP expansion cabinets.