Nortel Networks 1000 User Manual

Page 315

Functional description

315

Once all of the CND information has been stored in the memory buffer, the
CLASS Modem card begins transmission when requested by the system
software. Data is sent one ASCII character at a time. The CLASS Modem
card inserts a start and stop bit to each ASCII character sent.

The transmission of the calling party name/number to the terminating
telephone is accomplished through asynchronous FSK simplex-mode
transmission at 1200 bits/second over a 2-wire loop, in accordance with
the Bell 202 standard. The transmission is implemented by the appropriate
PCM equivalent of 1200 or 2200 Hz.

Upon completion of transmitting the CND data, the CLASS Modem
card sends a message to the system software to indicate successful
transmission of the CND data.

Eight modems can be associated with each module.

Table 115 "Time slot

mapping" (page 315)

shows time slot mapping for the CLASS modem

card.

Table 115
Time slot mapping

XCMC mapping of TNs

TNs

DS30X

timeslot

Modem units on the CLASS

Modem card

00
01
02
03

module 0,

00
01
02
03

04
05
06
07

08
09
10
11

module 1,

00
01
02
03

12
13
14
15

04
05
06
07

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008