Black Box MT720A-232T Manuel d'utilisateur télécharger pdf (Page 18)

CHAPTER 2: Introduction

• LAPB (layer 2) statistics:

Total number of I, RR, RNR, REJ, and FRMR frames transmitted and received by layer 2.

Number of transmission and reception errors.

LAPB state.

Current frame size.

•X.25 (layer 3) statistics:

Total number of I, clear, reset, and restart packets transmitted and received by layer 3.

Number of logical group in use.

Current packet size.

2.18 Diagnostic Features

Upon power-up or after reset, the Fradswitch performs a self-test, during which all its circuits are checked. If

there is a malfunction, the ERR indicator on the Fradswitch lights. The Fradswitch series also has diagnostic

functions that you can use to test it. See Chapter 5 of the Packet Switching Guide for more information.

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Black Box MT720A-232T Manuel d'utilisateur Page 18