Avaya Nortel Communication Server 1000 Reference page 248

NT5D60/80/81 CLASS Modem card (XCMC)
XCMC mapping of TNs
TNs
28
29
30
31
The CLASS Modem card is designed to plug into any one of the peripheral card slots of the
IPE module. The CLASS modem card supports up to 32 transmit-only modem resources, using
a DS30X interface. Up to 255 modems can be configured per system.
The CND transmission process begins with the system software sending an initiating message
to the CLASS Modem card indicating the length of the CND information and the type of the
CND information flow to be transmitted. In response, the CLASS Modem card assigns a
message buffer to capture the CND information from the system software.
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 is 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.
page 248 shows time slot mapping for the CLASS modem card.
Table 101: Time slot mapping
XCMC mapping of TNs
TNs
00
01
02
03
04
05
06
07
248 Circuit Card Reference
DS30X timeslot Modem units on the CLASS Modem card
28
29
30
31
DS30X timeslot Modem units on the CLASS Modem card
00
01
02
03
04
05
06
07
Comments? infodev@avaya.com
04
05
06
07
Table 101: Time slot mapping
module 0, 00
01
02
03
04
05
06
07
on
July 2011