Nortel Networks 1000 - Manual (Page 391)

Engineering guidelines 391
An address conflict may occur between the MSDL and other cards
because of truncated address decoding by the other cards. For example,
if a DCHI port is set to address 5, it’s companion port is set to address 4,
which means that none of the MSDL cards can have hexadecimal address
numbers 05H, 15H, É75H, nor addresses 04H, 14H, É74H. To avoid this
conflicts system software limits the MSDL card addresses from 0 to 15.
Port specifications
The MSDL card provides four programmable serial ports configured with
software as well as with switches for the following modes of operation:
Transmission mode Configure an MSDL port for synchronous or
asynchronous data transmission using LD 17.
Synchronous transmission uses an external clock signal fed into the
MSDL.
Table 156 "Synchronous interface specifications" (page 391) lists the
synchronous interface specifications and the means of configuring the
interface parameters.
Table 156
Synchronous interface specifications
Parameter Specification Configured
Data bits In packets-Transparent N/A
Data rate 1.2, 2.4, 4.8, 9.6, 19.2, 38.4,
48, 56, and 64 kbps Software
Transmission Full Duplex N/A
Clock Internal/External Software
Interface RS-232 Software
RS-422 Switches
Mode DTE or DCE Switches
Asynchronous transmission uses an internal clock to generate the
appropriate baud rate for serial controllers.
Table 157 "Asynchronous interface specifications" (page 391) lists
asynchronous interface specifications and the means of configuring
interface parameters.
Table 157
Asynchronous interface specifications
Parameter Specification Configured
Data bit, parity 7 bits even, odd or no parity,
or 8 bits no parity Software
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.