Software Interface Circuit - Avaya Nortel Communication Server 1000 Reference

NTAK93 D-channel Handler Interface daughterboard

Software interface circuit

This portion of the circuit handles address/data bus multiplexing, the interchange of data,
commands, and status between the on board processors and software. It includes transmit
buffer, receive buffer, command register, and status register for each communication
channel.
DPNSS/DCHI Port
The mode of operation of the DCH-PORT is controlled by a switch setting on the NTAK09/
NTBK50. For DPNSS the switch is ON; for DCHI it is OFF.
The port operates at:
The address of ports is selected by hardwired backplane card address. Port characteristics
and LAPD parameters are downloaded from software.
The address of a port is determined by the 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
546 Circuit Card Reference
Data Rate
Duplex
Clock
Interface
Comments? infodev@avaya.com
56kbps, 64kbps
Full
Internal / External
RS422
July 2011