363-206-285
Technical Specifications
10-62 Issue 3 June 2001
User Panel 10
The user panel contains red LEDs for CR and MJ alarms, yellow LEDs for MN and
PMN alarms, and for abnormal (ABN), far-end activity (FE-ACTY), and near end
activity
(NE-ACTY) status. These LEDs are used in conjunction with the far-end
identification (FE-ID) 7-segment display on the front panel of the adjacent
SYSCTL circuit pack to provide CIT-less single-ended operations.
A green PWR ON LED is lighted when the shelf is receiving −48 V power. A green
ACO LED is lighted when the ACO function is active.
The FE SEL test, ACO/TEST, and UPD/INIT push-buttons are provided to control
system operation.
Equipment Indicators 10
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 10
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 Discrete
Environmental Alarms and Controls 10
The user-definable miscellaneous discrete environmental alarm and control
interface allows the DDM-2000 OC-3 Multiplexer to monitor and control co-located
equipment at the remote site. At the remote terminal (RT) site, 21 alarm or status
environmental inputs can monitor environmental conditions (for example, open
door, high temp); 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 at the RT site; this closure is activated by −48 V DC. Prior to
Release 8.0, only 15 discretes are available. Four environmental control outputs
are provided to control external equipment (for example, pumps or generators).
The miscellaneous discrete outputs (control outputs at an RT, alarm/status
outputs at a CO) 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, alarm/status inputs in
an RT) 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.
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