29 BERUM - Class of Service Switchover


Restrictions	Functions of the AMO	Error Messages and Advisories
Interrelationships	Parameter Description

Stations are allocated two classes of service (COS1 and COS2) in (COS1 = normal or day COS COS2 = alternative or night COS) in their line tables.
The class of service are maintained by AMO COSSU and assigned to stations with the AMOs SCSU and SBCSU.
An identifier (COS pointer) in the line tables indicates which COS is active.

AMO SCSU and AMO SBCSU subdivides the stations into COS switchover groups (COSX groups). This is performed in order to group stations so that a certain COS can be switched active for all of them.
If no specific allocation has been made, a station belongs to COSX group 00. Stations with an active key switch (KEYSTN) are not changed over, but they are still assigned to a COSX group.
The COSX groups are independent of other station groups formed on the basis of other features.

Switchover between the two classes of service can be performed from a station, from an attendant console, centrally using the AMO, via data channel and/or by means of a timed switchover.

COS Switchover from the Station

A station authorized for this type of switchover can switch over between the COSs using the personal ID number (PIN) and a code for switchover using an active key switch (KEYSTN).
As long as the alternative COS (COS2) is active, the user hears the special dial tone when he lifts the receiver.
The station is assigned the authorization COSXCD (COS switchover by code) by AMO COSSU in order to be able to perform a switchover using the PIN.
The PIN (maximum of 12 digits) is defined by the AMO PERSI.

COS Switchover from the Attendant Console (ATND)

Switchover of the normal COS of the COSX groups to an alternative COS can be performed from every attendant console, including the night attendant console (performed with the task BEZUM).

COS Switchover by AMO

COS switchover for COSX groups of stations can be performed using the AMO BERUM.

COS switchover using a data processing system (DVA) is implemented via a data channel.

Automatic COS Switchover

The COS switchover for COSX groups can be carried out automatically at a specific, definable time. This time is defined using the AMO BERUZ (time table for times at which class of service switchover is to occur). Switchover is carried out by the task BEZUM.

Priorities for COS Switchover

The last COS switchover performed for a station is always in effect, regardless of where this change was carried out (from the station, from the attendant console or automatically).

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