Specifications

Copyright © AMETEK
11
11.1 Description
The Optical Transceiver Module provides a fiber
optic link between two FOCUS chassis, terminals,
or nodes. It transmits and receives information
over the system’s T1/E1 link. The module can
have either single or dual transceivers. The single
transceiver module has one transmitter and one
receiver. The dual transceiver module has two
transmitter and receiver pairs (designated as trans-
ceiver A and B on the module). Dual modules
include a programmable feature permitting the
disabling of one or both transceivers via the FCS.
To use the programmable feature FOCUS
firmware must be as follows;
• MV3 ≥ 3.10
• MV4 ≥ 4.12
• MV5 ≥ 5.0
The module provides a system gain of 31–36dB
for single-mode fiber. It uses on-board FC, ST or
SC connectors for both transmit and receive
circuits.
The frame format used is Multi-frame (E1) or
Extended Super Frame (ESF) for T1. All DS0
channels between nodes are 64 kbps clear
channels. It also permits terminals to communi-
cate operational information needed for network
reconfiguration, remote alarms, and system main-
tenance functions.
The Optical Transceiver Module also has two “hot
standby” options. The first option entails attaching
an auxiliary board with backup transceiver
connections. If you have a single transceiver
module, you attach an auxiliary board with a
single backup transceiver. For a dual transceiver
module, you attach an auxiliary board with dual
backup transceivers.
The second “hot standby” option is called the
“four-fiber hot standby.” This is a separate version
of the Optical Transceiver Module that has its own
auxiliary board.
Both hot standby options automatically switch
over from the transceiver pair experiencing the
failure to the standby, or backup, transceiver pair.
This way, if one transceiver pair goes down, the
backup transceiver pair maintains the link. (See
the following section for further information on
the two types of hot standby.)
The Optical Transceiver Module’s technical spec-
ifications are shown in Table 11-1.
11.2 Application
The Optical Transceiver Module is applied when
you are using a dedicated fiber optic link between
two FOCUS chassis.
11.2.1 Hot Standby Option
To ensure continuous, reliable communications,
you can attach the module’s hot standby piggy
back board. This gives you a backup transmission
path for each transceiver, should the primary link
be disrupted.
Figure 11–1. Sample FOCUS Network
without the Hot Standby Option.
Figure 11-1 shows a sample FOCUS network
without hot standby, while Figure 11-2 shows the
same configuration with the hot standby option.
11. Optical Transceiver Module