RAD Data comm FCD-V35 Instrukcja Użytkownika Pobierz pdf (Strona 2)

odular E1/T1 or Fractional E1/T1 Access Units Supporting Megaplex-

100 Modules

FCD-E1M, FCD-T1M

BASIC UNIT

• The basic unit contains a power

supply, a copper E1/T1 link, one

data port, and single a slot for a

Megaplex-2100 I/O module. The

sublink and Ethernet bridge/router

are optional.

• The E1 interface is compatible

with most carrier-provided E1

services and meets ITU

recommendations G.703, G.704,

G.706, and G.732. The E1

interface supports either 2 or

16 frames per multiframe, with or

without CRC-4. The main link also

operates in unframed mode to

generate an unframed signal. Line

code is HDB3. The integral LTU

(soft-selectable) ensures a range of

up to 2 km (1.2 miles).

• The T1 interface is compatible

with most carrier-provided T1

services and complies with

TR-62421. The T1 interface

supports D4 and ESF framed

formats. The main link operates in

unframed mode to generate an

unframed signal. Zero suppression

over the line is selectable for

either transparent, B7ZS, or B8ZS.

The integral soft-selectable CSU

ensures a range of up to one mile.

• FCD-E1M and FCD-T1M can be

ordered with a fiber optic main

link to eliminate the need for an

external fiber optic modem. The

fiber optic link provides a secure

link in hazardous or hostile

environments with greater range.

It complies with ITU standards

G.921 and G.956.

• Three fiber optic interfaces are

available:



850 nm laser for use over

multimode fiber at distances of

up to 5 km (3 miles)



1310 nm laser diode for use

over single-mode fiber at

distances of up to 62 km

(38 miles)



1550 nm laser diode for use

over single-mode fiber at

extended range of up to 100 km

(62 miles).

• Timeslot assignment is

programmable to allow data from

each data port and from the

sublink to be placed either

automatically into consecutive

timeslots, or manually, according

to user discretion.

• Multiple clock source selection

ensures maximum flexibility for

supporting different applications.

The E1 main link may derive its

timing from the recovered receive

clock, from an internal oscillator,

from one of the data ports, or

from the sub-E1 port.

• Bypassing the sublink to the main

link (other than fiber optic) ensures

uninterrupted service to the

sub-E1/T1 port and provides

immunity to hardware and power

failure.

• FCD-E1M and FCD-T1M are

standalone units. A rack mount

adapter kit allows installation of

one unit in a 19-inch rack.

USER INTERFACE

• The following data port interfaces

can be ordered: V.35, RS-530,

V.36/RS-449, or X.21. The ports

operate in the following clock

modes:



DCE: The FCD units provide the

transmit and receive clocks to

the user equipment, with an

option to sample the incoming

data with an inverted clock



DTE1: The external transmit

clock is taken from the user DTE



DTE2: Both the transmit and

receive clocks are taken from

the user DTE.

• When equipped with IR-ETH or

IR-ETH/Q bridge options,

FCD-E1M and FCD-T1M

transparently connect remote

LANs over unframed E1/T1 links

to utilize the full E1/T1bandwidth.

The bridges filter Ethernet frames

and forward only frames destined

to the WAN. The IR-ETH/Q bridge

also supports VLANs.

• The optional built-in Ethernet

router is a high-performance

remote IP router. It is ideal as a

LAN extender or segmenter over

bit-stream type infrastructures.

The router receives Ethernet

packets from the LAN and

forwards them to the IP network

on the Ethernet LAN or to the

WAN by destination.

• The optional sub-E1 port can be

configured to work without CRC-4,

while the E1 main link works with

CRC-4. This enables non-CRC-4

equipment to connect to a CRC-4

E1 network.

• The optional sub-T1 port can be

configured with D4 or ESF framing,

while the T1 main link uses ESF

framing. This allows connection of

T1 D4 equipment over a T1

network.

Figure 1. LAN and PBX Traffic over an E1/T1 Network

APPLICATIONS

1 2 3 4 5 6

FCD-E1M, FCD-T1M 1

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