Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 327 / 2536

363-206-285
Circuit Pack Descriptions
Issue 3 June 2001 7-49
intervals during operation to keep the slave unit updated. The NVRAM is
guaranteed to have a capability of 1,000 write cycles. The current state of
loopbacks is not considered a system setting, and an active loopback becomes
inactive during system resynchronization. Provisioning is not available at either
the slave unit or doubler units. The following system settings are available:
■
Smartjack Loopback Code Detection: ENABLE or DISABLE
■
Special Loopback Code Detection: A1LB, A2LB, A3LB, A4LB, or A5LB
■
Errored Second Threshold: NONE, 17, or 170 per 24 hours
■
Loopback Time-out: NONE, 20, 60, 120 minutes
■
Alarm Notification: ENABLE or DISABLE
■
Allocation of DS0 time slots on HDSL loop: ALTERNATE or CONTIGUOUS
■
Margin Alarm Threshold: 0-15 dB, 1 dB increments
■
DS0 blocking: individually (T1, FT1)
■
Fast Loss of Sync Word (LOSW): ENABLE or DISABLE
Performance Monitoring 7
From any unit in a system, HDSL performance data may be accessed for each
HDSL span in the circuit, including up to two HDSL doublers (three total HDSL
spans). Access to all PM data is through the faceplate RS-232 port only. Any unit
provides access to the following:
■
HDSL Span Current Status:
■
Alarms
■
Loopbacks
■
Margins
■
HDSL Pulse Attenuation
■
HDSL clock offset (PPM)
■
24-hour HDSL Errored Seconds
■
24-hour HDSL Unavailable Seconds
■
HDSL Span History:
■
15-min, 24-hour, 7-day HDSL Errored Seconds
■
15-min, 24-hour, 7-day HDSL Unavailable Seconds