Kuhnt AS55 Series, Руководство по обслуживанию

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SERVICE MANUAL AS55X
55Xseries_manual_V3.22 (18-08-15) www.kuhnt.com 55
synchron signal can be taken from an internal ISDN bus. In this case the PBX must
unconditionally synchronise itself to the PRI interface.
First you have to check if the interface the AS55X synchronisation interface (ISDN TE)
is connected to, uses a point-to-point or point-to-multipoint protocol. If the AS55X is
the only connected terminal, please select “single terminal”. Otherwise if more than
the AS55X uses this interface use “additional terminal”. For normal use one synchron
interface is enough. All AS55X ISDN interfaces will synchronize to it. In special
environments you can use the second ISDN TE interface to have a backup synchron
interface. Then both interfaces have the same permission. The AS55X uses the
interface where a clock is detected first. If this clock is lost, the other interface will be
used.
A synchronisation will not be necessary if the PBX has no other ISDN network
interface (e.g. VoiP).
Default Value: Off
This option is greyed-out if the AS55X is working in PassThrough mode.

Force layers up
The clocking of an ISDN interface can be shut down. But in order to recognise
interface failures and to react as fast as possible, keeping clock is recommended.
If layer 1 is chosen, the AS55X will only force the interface clocking. In case of layer 1
and 2, address (TEI) management in point-to-multipoint modes is done as soon as
possible and the data link layer will be held active.
There is no additional power consumption of the AS55X if the lower layers are active.
Default value: Layer 1 and 2
5.4.2 Protocol options

Protocol
You have to select the protocol of the BRI-Interfaces. Two protocol types can be
selected: DSS1 (defined by ETSI) or QSIG (defined by ECMA).
QSIG is originally defined for ISDN PRI interface. Here QSIG is used on BRI interface.
But some PBXs use PRI elements (e.g. the channel-ID). For normal use set “DSS1” for
point-to-multipoint connections and “DSS1 and QSIG” for point-to-point connections.
In this case the AS55X will detect the used protocol after the first call setup from PBX
to AS55X. If there are only connections from GSM to ISDN or the first call was from
AS55X to PBX, a fixed setting of the concerned information elements is necessary. If
the type, used by the PBX is unknown, it can be found in the trace of a call setup from
the PBX.
Default value: DSS1