Nortel Circuit Card Installation Manual page 767

NTAK93 D-channel Handler Interface daughterboard
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
Duplex
Clock
Interface
56kbps, 64kbps
Full
Internal / External
RS422
Circuit Card Description and Installation
Page 767 of 906