User Manual
U-SYS IAD108 Integrated Access Device
Chapter 5 Advanced
Configuration
5-5
{ <cr>|V21TimerLen<K> }:
Command:
pstnport attribute set 0 6 enable reverse
Data configuration succeeded!
IAD2000(config)#
Example:
Set the IAD to control the polarity reversal signal, use the
following command. To make this successful, it must be ensured that
the polarity reversal switch on the MGC is off.
IAD2000(config)#
mg system-parameter 23 1
IAD2000(config)#
II.
Configuring the Send and Receive Gains at the PSTN
Physical Port
The send and receive gains at the PSTN physical port of the
IAD108 are adjustable. Normally the volume of the talk can be greatly
enhanced by adjusting the send and receive gain at the PSTN physical
port of the IAD108.
z
As recommended in the Chinese national standards, the
send and receive gain of the local network is 0/-3.5 (that is,
high gain) and that of the toll network is 0/-7.
z
It is recommended in the foreign countries that the send and
receive gain of narrowband transmission is both 0/-7.
Because the voice of the IAD108 is sent and received by RTP
packets, which can be regarded as a group trunk, similar to the PCM
trunk, it is recommended to set the send and receive gain of the
subscriber physical port of the IAD108 to 0/-7 (that is, low gain).
