GAI-Tronics KETS 1141 Manuel d'installation et d'utilisation - Page 6

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KETS System Summary

KETS is an "omnibus" system, meaning that all the telephones are connected

in parallel on a single cable pair from the crossing to the concentrator.

In practice all the phones at a crossing are connected into a Line Termination

Unit (LTU), but this is a passive device containing only line conditioning

components, terminals to connect up to 4 devices to a common pair and an

ON OFF switch to isolate all crossing phones from the line. The ability for 4

telephones to work independently on a single pair with detailed fault

monitoring and without interfering with each other relies on each telephone

being an intelligent device with its own unique address on the system.

Addressing Procedure

To make sure that a KETS phone automatically acquires the correct address

the rules are simple:

Only apply power to a phone when the handset is OFF HOOK.

Always test ALL phones at a crossing before leaving site, even

if only a single unit has been changed.

These rules apply equally to a complete new crossing installation or

replacement of a unit or units on an existing installed crossing.

If a KETS phone powers up with the handset on hook, it will retain its previous

address. So, in the event of temporary disconnection or power interruption, all

phones will retain their original addresses and function normally.

When installing or replacing a phone, it is essential that it does not retain any

previously set address, for example from another crossing, which may cause

a conflict. Powering up with the handset off hook will force it to acquire a new,

unique address.

KETS 1141 Titan Illuminated Crossing Telephone