Exchange Observation Management Function

Definition

This management function makes it possible to observe the blocks exchanged on the lines when difficulties arise in the course of the procedure. The blocks observed are frames in the case of synchronous lines and messages in the case of asynchronous lines. The function never clears or resets the virtual circuit, transmits no interrupts, and ignores received data and interrupt packets. It deletes all exchanges acquired and not distributed upon reception of a reset.

Access

The syntax of the access code is:

: DNIC ZO 99 D IS No PASSWORD ACO No (CR)

Refer to paragraph 2 for a detailed breakdown of this code.

· IS No

03: BINARY MODE

04: ASCII MODE

· PASSWORD:

Exists if configured (OO by default).

· ACO No:

The breakdown of the suffix is:

ACO = NL + NO (for a synchronous line)
ACO = NL + TM + NO (for the asynchronous line)
where:
NL =	Number of the line (00 to 35) + virtual lines (64 to 128 and 160 to 239) of which the exchanges are to be observed. Exchange observation is possible only on line on which the function was called.
NO =	Number of bytes to be observed for each exchange or from 1 to 40 bytes, starting from:
	· the first byte of the frame for the synchronous lines,
	· the first byte of the message for the asynchronous line.
	· (NO = 40 default value).
TM =	Type of message to observe for each exchange on an asynchronous lines, i.e.:
	TM = A: observation of overall traffic
	TM = C: observation of commands
	TM = I: observation of indications
	TM = E: observation of transmissions
	TM = R: observation of receptions

Contents Of Messages Distributed

ASCII mode

A message transmitted by the exchange observation function is in the following form:

Figure 4-1: Exchange Observation Message Format

Example of a synchronous line message

Figure 4-2: Synchronous Line Message Format

Note For the exchange observation management function, there is no display of the call user data of the transmitted call packet.

Example of an asynchronous line message

Figure 4-3: Asynchronous Line Message Format

Frames or messages not observed

The number of messages or frames not observed are indicated to the operator by the display of the following type of message (when the standard heading is not present):

Figure 4-4: Messages Or Frames Not Observed Message Format

Table of Contents

Exchange Observation Management Function