Nortel FMT-150 Bay & Shelf Descriptions

FMT-150 Bay & Shelf Description

The Nortel FMT-150 fiber multiplex terminal equipment is designed for modular growth.  Each module, or circuit pack, performs a specific function, and most may be equipped only to meet particular requirements.  Since the system can be customized to fill individual needs, the customer need only pay for the option desired.

All FMT-150 shelves are equipped with a cover that allows ventilation of the circuit modules and monitoring of alarm indicators without removing the cover.

The FMT-150 is designed as a single shelf system that may be equipped in various configurations (e.g., FMT-150B, FMT-150C, or FMT-150D).  The shelves may be mounted on any 23 inch standard rack.  Circuit modules plug into the shelf from the front to provide easy access for maintenance or other servicing.  The FMT-150 shelf carries a DM-13 multiplexer and the associated electro-optic converter.  A typical example of a 7 foot bay configuration for eight bidirectional optical channels is shown in Figure 1.  A fully loaded bay is equipped with eight FMT-150 shelves, a fuse and alarm panael, and an AC outlet.

Standard Bays

A maximum of eight FMT-150 terminal shelves may be mounted in a 7 foot bay.  There is also additional bay space reserved for a fuse and alarm panel, AC outlet, ground bar, optical splice/storage panel, and future enchancements such as a centralized maintenance unit (i.e., CAMMS).

Nortel does not recommend installing more than the maximum recommended system in a bay.  Therefore, although bays up to 11.5 feet high are available, the region above the 7 foot bay should be left empty.

Central Access Maintenance and Monitoring System

Refer to Figure 2

The Central Access Maintenance and Monitoring System (CAMMS) device is an alarm surveillance and control system that will facilitate monitoring and maintenance of the FMT-150 transmission system.  In its simplest form, the CAMMS consists of a Maintenance Display Unit (MDU) that interfaces with a single FMT-150 system.  A Maintenance Processor Unit (MPU) is added to provide access to more than one FMT-150.

CAMMS is a single shelf unit measuring 14 inches wide, 5.6 inches in depth and 4.5 inches in height.  It is built to mount in a standard 19 inch rack, but for FMT-150 purposes, it may be equipped with 23 inch adapter brackets.

The unit occupies two and one half vertical mounting spaces of the bay layout.

As CAMMS contains a centralized display, it is recommended that the device be installed at a height allowing for a comfortable viewing level (i.e., below the first two FMT-150 shelves).


System Shelves

Refer to Figure 3

Circuit pack modules plug into the shelf from the front providing easy access for maintenance or other servicing.  The shelves require 23 inch mounting centers and should be mounted in unequal flange type bays to accomodate the 25.9 inch shelf width.  All FMT-150 shelves are equipped with snap-on covers that allow ventilation of the circuit modules, and monitoring of shelf alarm indicators with the covers installed.  The cover may be easily removed to access the internal equipment.

Circuit Pack Layout

Shelf Layout

The three FMT-150B shelf (or FMT-150B/C/D shelves) layouts are shown in Figures 4, 5, & 6.  Each shelf measures 25.9 inches wide, by 8.8 inches high, by 12 inches deep.  Each of the shelves provides space for four power supply units, two on each side of the shelf.  All circuit modules are installed and accessed from the front of the shelf.  The DM-13 multiplexer monitor and control module is mounted on hinges at the front of the shelf.  All other modules slide into position in pre-assigned slots inside the shelf.  On the backplane of each shelf, wire-wrap pins allow for connection of low-speed cabling, office alarms, E2A telemetry, and customer defined input and output points.  At the front of each shelf, subminax connectors for DS-3 signals are mounted, as well as alarm LED indicators, order-wire operation buttons and jacks, and an electrostatic discharge jack.

Equipment Connections

Each FMT-150B shelf (or FMT-150B/C/D shelves) requires connections for power, low-speed signals, high-speed signals, alarm telemetry, optical interfaces, and optional customer input/outputs.

Note: In addition to the above connections, there are six STX connections located in the FMT-150B backplane.  These STX connections are used to patch the overhead at a drop-and-insert site to provide communication between the two drop-and-insert shelves.

The FMT-150D shelf requires connections for power, high-speed signals, alarm telemetry, optical interfaces, and optional customer inputs/outputs.

With the exception of the DS-3 and optical interfaces, all connections are terminated on the customer access interface assembly located on the rear of each shelf.  The optical and DS-3 signals are terminated on the front of the shelf through subminax cabling for the DS-3 signals and optical patchcords or pigtails for the optical signals.

Communication between the DM-13 monitor and control module and the rest of the shelf is accomplished through a set of three internal ribbon connectors that connect the monitor and control module to the internal backplanes of the shelf.  The three ribbon cables are connectorized on one end to allow removal from the monitor and control module if a changeout is required.




Customer Access Interface Assembly

Refer to Figures 7, 8, & 9

There is one customer access interface assembly for each FMT-150 shelf.  This assembly is located on the rear of the shelf and depending on the FMT-150 application, terminates some or all of the following:

Note: A front mounted customer access interface assembly is also an available option.

Optical Termination Tray

If the optical patchcords are spliced to the outside plant cable, an optional termination tray may be ordered.  This tray will provide the area needed for cable splicing.  The typical location of this tray in a 7 foot bay is directly under the optional fuse and alarm panel.

The optical termination panel occupies one 1.75 inch vertical mounting space.

Note: An optical storage tray is also available providing for storage of excess fiber.

Fuse and Alarm Panel

Refer to Figure 10

An optional fuse and alarm panel may be installed at the top of a FMT-150 bay.  This provides a common connection point for all power cabling and alarm telemetry.  Two 5 Amp fuses are equipped for each FMT-150 shelf.  Connections inside the fuse and alarm panel provide access to relay closure alarms and the E2A serial telemetry interface.

There are three lamps (LEDs) on the fuse and alarm panel faceplate:

The fuse and alarm panel occupies two 1.75 inch vertical mounting spaces.

Alarm Lamps

The FMT-150 provides four levels of alarm lamps for troubleshooting:


Bay Alarms

The bay major and minor alarms are provided as red and yellow lamps on the fuse and alarm panel.  Major alarms (red) include those that involve a service failure at the DS-3 level or higher.  Minor alarms (yellow) include any non-service affecting alarms at any level, or a service affecting DS-1/1C/2 line alarm.

Shelf Alarms

The shelf alarm indicators are located at the top of the shelf and remain visible with the shelf cover installed.  The LED indicators are as follows:

Monitor and Control

In the FMT-150B/C, the monitor and control module only has one red LED for Mon Dis/Unit Fail.

Circuit Pack Alarms

All FMT-150 circuit packs containing active components include one or more LEDs to provide alarm and/or status information about the unit.  These LEDs can be hardware or software related (depending on the type of failure).  A red LED indicates an alarm, green and yellow LEDs are used for status indication.

Shelf Features

Features at the front of the FMT-150B shelf are shown in Figure 11 and described below:

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FMT-150B Shelf Description

Connectors             Description
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SIG OUT 1, 2, 3        DS-3/STX output 1, 2, and 3 form DS-3/STX translators respectively
SIG IN 1, 2, 3         DS-3/STX input 1, 2, and 3 to DS-3/STX translators respectively
DS-3 IN 1              DS-3 input to DM-13
DS-3 IN 2              Not used for this application
DS-3 OUT 1             DS-3 output from DM-13
DS-3 OUT 2             Not used for this application
CLK OUT 1, 2, 3        DS-3 #1, #2, and #3 clock
CLK IN                 External clock for the 150 Mb/s system
MUX CLK                External clock input for the DM-13 multiplexer
ESD                    Used to ground personnel to prevent accidental discharge
Handset/Headset Jack   Provides voice communication over the order-wire facility
RS-232 Jack            Provides interface for CRT/CAMMS cable
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LEDs                   Description
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MAJOR                  Red - Service affecting alarm
MINOR                  Yellow - Non-service affecting alarm
FUSE ALM               Red - A shelf fuse has been blown
REM                    Yellow - An alarm has occurred at a remote site




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Buttons                Description
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LP TEST                Lamp Test - Lights up all the LEDs
ACO                    Alarm Cut-Off - Turns off existing audible alarm indicators
LOC 1, 2, 3            Local Order-Wire - Rings every site common to STX signal #1, #2, #3
EXP 1, 2, 3            Express Order-Wire - Rings every site common to STX signal #1, #2, #3
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Fuses                  Description
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Fuse 1, Fuse 2         5 Amp GMT type fuse on the BATA and BATB feeds respectively
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-End-

Features at the front of the FMT-150C shelf are shown in Figure 12 and described below:

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FMT-150C Shelf Description

Connectors             Description
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MUX 1 IN               DS-3 input to DM-13
MUX 2 IN               Not used for this application
MUX 1 OUT              DS-3 output from DM-13
MUX 2 OUT              Same as DS-3 OUT 1, but not used for this application
MUX 1, 2 CLK           External clock 1 and 2
ESD                    Used to ground personnel to prevent accidental discharge
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LEDs                   Description
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MAJOR                  Red - Service affecting alarm
MINOR                  Yellow - Non-service affecting alarm
FUSE ALM               Red - A shelf fuse has been blown
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Fuses                  Description
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Fuse 1, Fuse 2         5 Amp GMT type fuse on the BATA and BATB feeds respectively
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-End-

FMT-150D info missing.  You know how it goes...

Environmental Specifications

The specified temperature ranges for FMT-150 equipment are given below.

Note: Short term is defined to be no more than 72 consecutive hours, no more than a total of 15 days per year.

Temperature

Relative Humidity

Figure 1: FMT-150 Bay and Shelf Overview

Figure 2: CAMMS Shelf Assembly

Figure 3: CAMMS Unit

Figure 4: FMT-150B Circuit Pack Layout

Figure 5: FMT-150C Circuit Pack Layout

Figure 6: FMT-150D Circuit Pack Layout

Figure 7: FMT-150D Customer Access Interface Assembly - 1

Figure 8: FMT-150D Customer Access Interface Assembly - 2

Figure 9: FMT-150D Customer Access Interface Assembly - 3

Figure 10: NT7H46AA/BA Fuse and Panel Alarm

Figure 11: FMT-150B Shelf Features

Figure 12: FMT-150C Shelf Features

Figure 13: FMT-150D Shelf Features