ASCOM Ascotel 2025, Системное руководство

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ascom Ascotel 2025/2045/2065
HBT_20321104_03/B0_en Planning a PBX 3.27
4.5.3 Periodic Reactivation of Layer 2 on the T Interface
1)
Layer
2 of the T network interface can be reactivated periodically every three minutes
so that incoming calls are not rejected already at the local exchange if and when
temporary interruptions in the U
interface should occur. To do so, configure the parameter "L2 reactivation" of the
T network interface to "special".
Note:
In some countries T network interfaces are deactivated after a certain
amount of time without traffic, and are only reactivated when the PBX
once again requests a connection.
4.5.4 Attenuation on analogue Network Interfaces
With analogue network connections you have a choice of four different attenua-
tion settings:
• "Long" or
• "Long D" for long lines
• "Short" or
• "Short D" for short lines
The ”... D" setting functions to increase the volume in an "analogue exchange -
digital subscriber" connection type by 3 dB in both directions as this type of con-
nection is generally perceived as too quiet. The reference level is modified accord-
ingly on the TC-04AB expansion card. Due to the restriction to the aforemen-
tioned connection type, the "... D" setting does not result in an increase if an ana-
logue user-network interface is involved in a connection.
Restriction:
The ”... D" setting should not be used (or only once the stability conditions have
been thoroughly clarified) if the equipment (Terminal Adapter) operated on digital
interfaces also features a four-wire to two-wire conversion, i.e. an analogue two-
wire interface.
1)
Only in Germany and Austria