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Primary to Basic Rate ISDN Multiplexer
SALES: 0118 965 5100
Protocol Analyser
Introduction
The Protocol Analyser is a useful feature for checking the operation of the Primary to Basic
Rate ISDN Multiplexer. It allows the ISDN protocol on each interface to be checked.
The analyser is operated using the Analyser Setup Menu (the “Menu System” chapter).
This section describes the display of the analyser trace and the commands that can be used to
scroll through the trace.
Information Provided at Layer 1
A typical display of a layer 1 message is shown below.
23: Ch BRI 1 L1 STATE= Activated
00:01:75:30.271
The information presented is outlined below.
(a) Sequence Number
Each message has a unique sequence number so that old messages can be easily located.
(b) Channel Number
The channel number (e.g.BRI 1) on which the event occurred.
(c) Layer Number
The layer on which the event is being reported.
(d) State
The new state of the physical layer e.g. Activated.
(e) Timestamp
The time that the message was recorded. The timestamp has the form dd:hh:mm:ss.nnn where
dd represents days, hh hours, mm minutes, ss seconds and nnn milliseconds.
Note that layer 1 messages are generated only if a change occurs in the state of the physical
link.
