Nortel Networks 1000 User Manual
Page 313
Functional description
313
System software then sends the CND information to the CLASS Modem
card, one byte at a time, where it is stored in the message buffer. If
the CLASS Modem card receives more bytes than were specified in
the initiating message, then the additional bytes are discarded and not
included in the CND memory buffer.
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.
shows time slot mapping for the CLASS modem
card.
Table 114
Time slot mapping
XCMC mapping of TNs
TNs
DS30X
timeslot
Modem units on the CLASS
Modem card
00
01
02
03
00
01
02
03
module 0, 00
01
02
03
04
05
06
07
04
05
06
07
04
05
06
07
08
09
10
11
08
09
10
11
module 1,
00
01
02
03
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.