CTC Union FMUX-01, Руководство пользователя

Страница: 17 / 59

Chapter 2. Port Card Overview
2-1
FMUX-01Mar 2003
2.1 Introduction
This chapter provides brief 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 MULTIPLEXER
UNIT 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 (and possibly cause permanent damage to the unit).
2.2 Port Card Overview
The 4-Channel Port Cards for the
MULTIPLEXER UNIT
are modular PCAs which
slide into the
MULTIPLEXER UNIT
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 MULTIPLEXER UNIT are modular PCAs
which slide into the MULTIPLEXER UNIT chassis and provide four completely
independent G.703 E1 interfaces. The module 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
MULTIPLEXER UNIT
are modular PCAs
which slide into the
MULTIPLEXER UNIT
chassis and provide four completely
independent T1(DS1) interfaces. The module is available with four RJ-45 jacks for 100
Ohm balanced connections.
2.5 External Clock Overview
The MULTIPLEXER UNIT is available with an external clock option that allows the
unit to be synchronized with external clocks or equipment. The MULTIPLEXER UNIT
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.