Nortel Networks Circuit Card - Manual (Page 856)

Page 856 of 906 QPC513 Enhanced Serial Data Interface card
553-3001-211 Standard 3.00 August 2005
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
program LD 48. The self-test tests all ESDI functions up to, but not including,
the ESDI line drivers and receivers.
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)
Table 266
Characteristics of synchronous ports (Part 2 of 2)
Characteristics Description
Note 1: * See the Configuration Record (LD 17) in Software Input/Output:
Administration (553-3001-311) to modify the link control system
parameters and performance thresholds.
Note 2: The values in parentheses are the default.