Aastra Ascotel IntelliGate 2025 - 4.5.3 Periodic Reactivation of Layer 2 on the TInterface; 4.5.4 Attenuation on analogue network interfaces

Ascotel IntelliGate 2025/2045/2065
604 Planning a PBX Part 3
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 after
potential temporary interruptions in the U-interface. To do so, configure the
parameter "L2 reactivation" of the T network interface to "special".
Note:
In some countries T network interfaces are deactivated once a certain
amount of time has elapsed 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
On lines with a loop resistance of < 280 W, "Short" or "Short D" should be
selected to avoid problems with echo or instability (feedback).
The ”... D" settings are used 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.