Specifications

FCD-E1LC Ver. 1.0 Overview 1-1
Chapter 1
Introduction
1.1 Overview
Purpose
The FCD-E1LC is a managed access unit for business applications that integrates
voice and data traffic over E1 (2.048 Mbps) and fractional E1 services. FCD-E1LC
supports advanced management capabilities, including SNMP.
Product Options
The basic FCD-E1LC is offered with the following payload-carrying ports:
• E1 main link. This port has an ITU-T Rec. G.703 copper interface that can be
directly connected to E1/fractional E1 networks. The main link interface type
(balanced or unbalanced) is automatically selected in accordance with the
cable connected to the port (to support automatic selection, RAD offers a
special adapter cable). The interface operating mode, DSU or LTU, is
software-selectable. The integral LTU provides a range of up to 2 km.
• User channel 1. The FCD-E1LC is offered with a synchronous high-speed data
channel. This data channel can operate at rates of n×64 kbps or n×56 kbps,
where n is up to 31. The synchronous data channel can be ordered with
RS-530, V.35, V.36, or X.21 interface. The V.35, V.36 and X.21 interfaces are
supported by means of adapter cables.
FCD-E1LC can also accept a 2048 kbps data stream from a data channel and
convert it to an ITU-T Rec. G.703 unframed signal for transport over the E1
main link, and thus it can also serve as an interface converter and
high-speed, short distance modem.
In addition to the ports available on the basic FCD-E1LC unit, the following
additional payload-carrying ports can be ordered:
• E1 sublink. This port has characteristics similar to those of the main link port,
and it enables chaining of FCD-E1LC units, drop-&-insert, connection of
fractional E1 equipment, connection of a PBX with E1 trunk, etc.
• User channel 2. The FCD-E1LC also supports a second, optional user channel.
This channel can be ordered with one of the following interfaces:
 Synchronous high-speed data channel with characteristics similar to those of
channel 1.
 Asynchronous channel with a V.24 interface.