363-206-295
Technical Specifications
10-30
Issue 1
December 1997
Equipment Indicators
1
0
A red LED FAULT indicator is provided on all circuit packs. A green LED ACTIVE
indicator is provided on all 1x1 protected circuit packs to indicate which circuit
packs are actively carrying traffic.
Office Alarms
1
0
The office alarms interface is a set of discrete relays that control office audible and
visual alarms. Separate relays handle CR, MJ, and MN alarms. Each contact
closure is rated at 1 A, 60 V, maximum. The CR and MJ alarms can be wire-
ORed. The CR alarm relays are fail-safe against unprotected power failures.
User-Definable Miscellaneous Discretes—
Environmental Alarms and Controls
1
0
The user-definable miscellaneous discrete environmental alarm and control
interface allows the DDM-2000 OC-12 Multiplexers to monitor and control
equipment at the local site. Twenty-one alarm or status environmental inputs can
monitor environmental conditions (for example, open door, high temperature);
these inputs are activated by contact closures. The 15th environmental alarm or
status input is provided to monitor the condition of the power shelf and fans; this
closure is activated by
−
48 V DC. Four environmental control outputs are provided
to control external equipment (for example, pumps or generators). The
miscellaneous discrete outputs (control outputs, alarm/status outputs) tolerate
−
60 V maximum open circuit voltage and 35 mA maximum current. Transient
voltages up to
−
135 V are tolerated for up to 1 ms. The miscellaneous discrete
inputs (control inputs at a CO) provide
−
48 V nominal (
−
60 V maximum) open
circuit voltage and 2 mA maximum current. The miscellaneous discrete output
closures generated by the optoisolator require external voltage and ground to
operate.
The 21 alarm or status inputs can be reported through a TL1/X.25 interface.
