Black Box MT720A-232T Manual do Utilizador Página 18

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CHAPTER 2: Introduction
17
• 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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