ADTRAN 850 Bedienungsanleitung PDF herunterladen (Seite 27)

61200375L1-1

TA 850

TA 850 SDSL RCU UIG/61200377L1-31A

Page 27 of 76

Idle Cells

The I

DLE

ELLS

format must be configured for either ATM F

ORUM

or ITU. Configuring this setting incor-

rectly for a particular circuit will cause poor performance at the ATM layer.

Data Scrambling

ATA

CRAMBLING

can be E

NABLED

or D

ISABLED

for cell traffic. Configuring this setting incorrectly for a

particular circuit will cause poor performance.

>Frame Relay

Frame Relay is a connection-oriented service requiring circuits to be configured by your carrier to establish a physical

link between two or more locations. Multiple virtual circuits (which appear as virtual point-to-point links) can be run

through the same physical connection.

There are two types of virtual circuits supported in Frame Relay: Permanent Virtual Circuits (PVC) and Switched Vir-

tual Circuit (SVC). PVCs are like dedicated point-to-point private lines. Since the physical connection is always there

in the form of a leased line, call setup and tear down is done by a carrier via a network management system. SVCs

require setup and tear down and are generally not available from Frame Relay carriers. Virtually all Frame Relay com-

munications are implemented using PVCs. The TA 850 supports PVCs only.

A number called the Data Link Connection Identifier (DLCI) identifies each virtual circuit within a shared physical

channel.

Frame Relay/Maintenance Protocol

The Frame Relay maintenance protocol is used on the WAN port. The maintenance protocol is used to send

link status and virtual circuit information between Frame Relay switches and other devices (such as routers)

that communicate with them. Possible choices are listed below.

This setting must match the configuration setting of the ATM switch or DSLAM at the other end of

the circuit.

This setting must match the configuration setting of the ATM switch or DSLAM at the other end of

the circuit.

NNEX

D(def)

This is an ANSI standard and is the most commonly

used standard in the US.

NNEX

This is the CCITT European standard.

LMI

This was developed by a vendor consortium and is

also known as the “consortium” management inter-

face specification. It is still used by some carriers in

the U.S.

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