Nortel Networks Circuit Card 311 - Manual (Page 1093)

Functional description 1093
The characteristics of the synchronous communication ports are shown in
Table 443 "Characteristics of synchronous ports" (page 1093) .
Table 443
Characteristics of synchronous ports
Characteristics Description
Duplex mode half, (full)
Data rate (bps) 1200, 2400, (4800), 9600, 19200,
48000, 56000, 64000
Clock (internal), external
Data Link Level LAPB protocol
SL-1 address (1), 3
Data Link Level LAPB protocol remote host
address (3), 1
Modify link control system parameters* yes, (no)
Modify link performance thresholds (Note 1) yes, (no)
Note 1: * See the Configuration Record (LD 17) in Software Input/Output
Reference — Administration (NN43001-611) to modify the link control system
parameters and performance thresholds.
Note 2: The values in parentheses are the default.
Clock timing option
The ESDI card offers two timing options:
• Internal: The ESDI card uses an internal timing source to synchronize
data transfers to the external device.
• External: The ESDI card accepts a timing source from the high-speed
interface connector to synchronize data transfers to the external device.
Test and maintenance features
The ESDI card has these built-in testing and maintenance capabilities:
Self-test
The ESDI card performs a self-test of its major components immediately
after power-up. The self-test can also be initiated through the Link
Diagnostic programLD 48. The self-test tests all ESDI functions up to, but
not including, the ESDI line drivers and receivers.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.