ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 242)

11. System Parameter Specification
MSAP2000 Technical Manual V3.0 11-13
Figure 11-C
Signal-to-Total
Distortion Ratio for
the following
Modules:
FXO
FXO-P
FXS
FXS-P
2W E&M
After a 1020Hz Sin Wave Signal is input into a channel, an
appropriate amount of weighed noise (complying with ITU-T
G.223 standards) is mingled with this Signal. The distortion
ratio of the Signal that emerges from the channel’s output port
falls entirely within the normal acceptable range, as shown in
the below diagram.
Figure 11-D
Gain Variation to
Input Signal Level, for
the
Following Modules:
FXO
FXO-P
FXS
FXS-P
2W E&M
4W E&M
After a -55~+3 dBm0 Signal is inputted into a channel, the
Gain Variation of that channel is compared with another
channel whose input level is -10 dBm0. The comparison
results are shown to be entirely within normal acceptable
range, as shown in the following diagram.