RAD Data comm FCD-V35 Manuel d'utilisateur télécharger pdf (Page 2)

E1/T1 or Fraction

l E1/T1 Managed Access Units

FCD-E1L, FCD-T1L

• Multiple clock source selection

ensures maximum flexibility to

support different applications.

The E1/T1 main link may be

timed from an internal oscillator,

the recovered receive clock, or

one of the data ports.

• Front panel LEDs indicate alarms,

an E1/T1 signal loss condition, and

diagnostic loopback operation.

Rear panel LEDs on the Ethernet

interface modules indicate activity

and status of the LAN.

• FCD-E1L and FCD-T1L are

compact standalone units.

A rack mount adapter kit enables

installation of one or two

(side-by-side) units in a 19-inch

rack (see Ordering).

USER INTERFACES

• FCD-E1L and FCD-T1L support

the following types of user

interfaces:



Serial data interfaces: RS-530,

V.35, X.21, V.24, V.36/RS-449



Ethernet LAN interface modules

with a built-in bridge (IR-ETH,

IR-ETH/Q, IR-ETH/QN) or an

IP router (IR-IP).

• The synchronous data ports can

operate in the following clock

modes:



DCE: the unit provides both

transmit and receive clocks to

the user equipment, with

optional sampling of incoming

data with an inverted clock.



DTE1: the FCD unit provides

the transmit clock, the attached

user equipment provides the

receive clock



DTE2: the attached user

equipment provides both

transmit and receive clocks.

• When equipped with IR-ETH,

IR-ETH/Q, or IR-ETH/QN

interface modules, FCD-E1L and

FCD-T1L transparently connect

remote LANs over E1/T1 links.

They filter Ethernet frames,

forwarding only frames that are

destined to the WAN. The

IR-ETH/QN port supports

autonegotiation and VLAN frames.

• When an IR-IP interface module is

installed, the units operate as IP

gateways to forward IP packets

that are destined to the IP

network. This prevents broadcast

to the WAN and enables LAN

users to register for IP multicast

groups.

• FCD-E1L and FCD-T1L with the

IR-IP interface module also

connect local IP networks to

public networks at full E1/T1

speed, in contrast with connection

over statistical protocols, such as

Frame Relay.

• The IR-ETH/QN port has a

10/100BaseT interface while other

Ethernet ports have 10BaseT

(UTP) interfaces.

MANAGEMENT AND MAINTENANCE

• Status and diagnostic information

is defined, configured, and

monitored using one of the

following methods:



ASCII terminal connected to the

async control port



SNMP management



Telnet

• FCD-E1L and FCD-T1L have an

internal SNMP agent that is

managed by any generic SNMP

station or by the RADview SNMP

network management application.

• The units support both dial-in and

dial-out modem connections

through the serial RS-232 port,

by using SLIP or PPP protocol, or

a command line interpreter on an

ASCII terminal. These out-of-band

connections can be used for

remote configuration and

monitoring, as well as for sending

callout alarm messages.

• Inband management can be

performed either via a dedicated

timeslot with the standard Frame

Relay (RFC 1490), or by using the

spare bits (S

bits) on Timeslot 0

(FCD-E1L) or FDL bits (FCD-T1L).

This allows the user to set up,

monitor, and run diagnostics on

the remote unit. If spare bits on

TS0 or FDL are used for inband

access, they must be passed

transparently end-to-end.

• Maintenance capabilities include

user activated local and remote

loopbacks on the E1/T1 main link

and data ports. Local loopbacks

can be activated either from the

terminal or via the DIP switch.

The user can activate a BER test

on the data port. Additionally, the

data port responds to an ANSI FT1

RDL (T1E1.2/93-003) inband loop

code, generated by the remote

FCD-E1L, FCD-T1L, or DXC in a

specific bundle of timeslots

allocated only to that port.

APPLICATION

1 2 3 4

FCD-E1L, FCD-T1L 1

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RAD Data comm FCD-V35 Manuel d'utilisateur Page 2

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