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AC Transmission Characteristics (MTK-40131 System)
Transmit and Receive
Filter Characteristics
The Short-haul POTS chipset implements
-0.3
receive
0.0
transmit
receive / transmit
0.35
0.55
0.75
1.0
1.5
200
300
400
Fig 9: Transmit and receive frequency response (default).
Delay
µs
1800
1500
1200
900
600
300
0
500
600
Fig 10: Relative Group delay, transmit and receive paths
(Digital to Digital) refered to 1kHz
transmit and receive filters according to
ITU-T (G.712). These filters can be
reprogrammed by the user for specific
requirements. Please contact Alcatel
600
2400
3000
1000
2000
2600
2800
18
MTK-40131
Microelectronics for further details on
this. The default filter characteristics
implemented are shown in figures 9
and 10 below.
12.5 1 - SIN
12.5
25.0
3600
4000
3400
Transmit and Receive Gain
Transmit (from analog subset towards
frequency
the switching system) and receive gains
Hz
are user programmable, independently
for both lines. The default values are
0dBr in the transmit direction, and -
7dBr in the receive direction.
π (4000-ƒ)
dB
1200
4600
16000
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