Operations Interfaces
Issue 8.0 July 2002
6-21
Any external customer equipment to be monitored by the FT-2000 OC-48
Lightwave System must provide the electrical equivalent of a contact closure
across the corresponding environmental input wiring pairs. The contact closure
must be capable of passing at least 10 mA of drive current.
The power source to enable the FT-2000 OC-48 Lightwave System to control
external customer equipment may be from a minimum of 3 V to a maximum of
72 V. The FT-2000 OC-48 Lightwave System provides a unidirectional
opto-isolator connection across each corresponding control output wiring pair.
The load current across each control output wiring pair must be limited by the
external customer equipment and must not exceed 35 mA. For detailed wiring
information, refer to 365-575-104,
FT-2000 OC-48 Lightwave System, Releases 1
and 2, Installation Manual
; 365-575-115,
FT-2000 OC-48 Lightwave System,
Releases 3, 4, 5, 6, and 7 Installation Manual
; and SD-5G250-02,
FT-2000 OC-48
Enhanced Lightwave Terminating Bay Application Schematic
(or SD-5G250-01,
FT-2000 OC-48 Lightwave Terminating Bay Application Schematic
).
The environmental inputs are addressed by the numbers 1 through 16, and the
control outputs are addressed by the numbers 1 through 4. The environmental
inputs can be assigned in any order; however, if the bay is equipped with a fan
assembly, the number 16 input is reserved for the fan alarm.
In Release 5 and later releases, the number 1, 2, 3, and 4 inputs are reserved for
alarms from an FT-Lightwave Booster Amplifier. Table 6-1 shows the guidelines
for mapping the miscellaneous discrete points from the FT-LBA to environmental
inputs of the FT-2000 OC-48 Add/Drop-Rings Terminal.
Refer to Volume I, Section 8, "Administration and Provisioning," for information
about provisioning a string of characters associated with an environmental input
or control output.
Operations system access to individual environmental inputs and control outputs
at an FT-2000 OC-48 Add/Drop-Rings Terminal is provided through the serial
telemetry interface using the telemetry byte-oriented serial (TBOS) protocol.
Access to environmental inputs is also provided through the X.25 interface.
Table 6-1. FT-LBA Miscellaneous Discrete Mapping
FT-LBA Miscellaneous Discrete
FT-2000
Environmental Input Suggested Text
Fuse/Power Alarm 1 FT-LBA fuse/power
failure
Fan Alarm 2 FT-LBA fan failure
1EW (Service) Failure 3 FT-LBA 1EW failure
1WE (Service) Failure 4 FT-LBA 1WE failure
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