NTAK93 D-channel Handler Interface daughterboard Page 755 of 894
Circuit Card Description and Installation
The port will operate at:
The address of ports is selected by hardwired backplane card address. Port
characteristics and LAPD parameters are downloaded from software.

D-Port — SDTI/PRI interface

Below is a brief description of signals. When connected to SDTI/PRI,
DCHI-PORT is considered Data Terminal Equipment (DTE):
SDA, SDB: Transmit Clock provided by SDTI/PRI
RTA, RTB: Receive Clock provided by SDTI/PRI
RR, CS: SPDC ready signal provided by DCHI-PORT
TR: D-PORT ready signal provided by DCHI-PORT
RDA, RDB: Incoming serial data bit stream, driven by SDTI/PRI
SDA, SDB: Transmit serial data bit stream driven by DCHI-PORT
Data Rate 56kbps, 64kbps
Duplex Full
Clock Internal / External
Interface RS422