ADTRAN 1200214L1 Spezifikationen PDF herunterladen (Seite 30)

Chapter 1. Introduction

1-2 IQ Probe User Manual 61200214L1-20

• Control port provides SLIP and async PPP access to SNMP or VT-100

terminal configuration

• Dial backup (DBU) available with DBU cards; options include 4-wire

Switched 56 (SW56), V.34, ISDN, and external DCE card

• End-to-end network round trip delay measurements for network

optimization

• Frame IQ MIB is standard ANSI format compatible with popular

enterprise reporting systems

• Optional IQ View

software system provides a cost-effective, easy-

to-use GUI (graphical user interface) for performance management

• DTE (data terminal equipment) and DCE (data communications

equipment) interfaces support interface standards of EIA-232, V.35,

X.21, and EIA-530

UNDERSTANDING FRAME RELAY

Frame relay is a wide area network (WAN) service designed to minimize

physical connections. This is accomplished by using virtual connections

within the frame relay cloud and accessing these virtual circuits with nor-

mally one physical connection at each location to the frame relay service.

Virtual circuits are addressed using header information at the beginning

of each frame. These frames are formatted by a device such as a router or

FRAD (frame relay access device) and monitored by the IQ Probe.

ANSI (American National Standards Institute) standards describe how

each frame must be constructed to provide interoperability between CPE

equipment and frame relay switching equipment. Each frame must con-

tain a header, at least one byte of information data, two bytes of CRC16,

and a trailing flag 0x7E.

This header information contains a virtual circuit address known as a

DLCI (data link connection identifier). The header information also con-

tains bits used for network congestion control.

Frame relay virtual circuits may be defined as permanent (PVC) or

switched (SVC). PVCs have the same DLCI for a given path each time a

user protocol session is established. The network service provider assigns

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ADTRAN 1200214L1 Spezifikationen Seite 30