User manual

Chapter 2. Port Card Overview
11 Version 1.2 Apr 2006
2.1 Introduction
This chapter provides a more descriptive over-view of the available 4-Channel Port card
options. Detailed specifications are in Chapter 1, while removal and replacement procedures are
detailed in Chapter 3. Unit configuration is all covered in Chapter 4. The cards are NOT designed to
be "hot" swappable, therefore make sure the Fiber Multiplexer chassis is powered off before
replacing a card or pulling it from the chassis. Removal and installation of 4-Channel Port Cards
with the rack chassis under power is NOT RECOMMENDED and will definitely effect the
operation of the other 4-Channel Port Cards (insertion and removal cannot be recognized by the
Fiber Multiplexer ).
2.2 Port Card Overview
The 4-Channel Port Cards for the Fiber Multiplexer are modular PCAs which slide into
the Fiber Multiplexer chassis, and interface with the internal "main board". The main board
provides an interface connection to the 4-Channel Port Cards for power, data connection and
other logic (for local management terminal and optional SNMP).
2.3 4 x E1 I/F Module Overview
The 4 x E1 4-Channel Port Cards for the Fiber Multiplexer are modular PCAs which slide
into the Fiber Multiplexer chassis and provide four completely independent ITU-T G.703 E1
interfaces. The PCA module terminates with a DB25F connector that is designed to connect to a
physical adapter. The adapter is available in two options, one, with 4 pairs of BNC connectors for
75 Ohm unbalanced connections and the other with four RJ-45 jacks for 120 Ohm balanced
connections.
2.4 4 x T1 I/F Module Overview
The 4 x T1 4-Channel Port Cards for the Fiber Multiplexer are modular PCAs which slide
into the Fiber Multiplexer chassis and provide four completely independent T1(DS1) interfaces.
The PCA module terminates with a DB25F connector that is designed to connect to a physical
adapter. The adapter is available with four RJ-45 jacks for 100 Ohm balanced connections.
2.5 External Clock Overview
The Fiber Multiplexer is available with an external clock option that allows the unit to be
synchronized with external clocks or equipment. The Fiber Multiplexer may receive an external
clock source from E1 PCM, E1 TTL, T1 PCM or T1 TTL signal sources. Additionally, the option
includes its own precision crystal based clock. The external clock is received via an RJ-45 jack
from the rear panel.
Ext Clk
1. Rx - (RRing)
2. Rx + (RTip)
Figure 2-1. External Clock Connector