ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 240)

11. System Parameter Specification
MSAP2000 Technical Manual V3.0 11-11
11.7. 2W/4W E&M Interface
Parameter 2W 4W
Standard ITU-T G.712
Signaling Transmission
Format Please refer to Table 11-G
Caller ID Display Supports DTMF and FSK
Impedance (balanced) 600
Ω
Standard
Specification
(Table 11-E)
Line Code ITU-T G.711 A-law
Signal Direction A Side Status B Side Status
A to B B to A M Line E Line M Line E Line
On-hook On-hook Open Open Open Open
Off-hook On-hook Ground Open Open Ground
On-hook Off-hook Open Ground Ground Open
Off-hook Off-hook Ground Open Open Ground
Signaling
(Table 11-F)
Complies with ITU-T G.712 recommended standards. The signal
status of this entire interface must be coded and imbedded into a,
b, c, d, bits, within Slot 16 of the E1 Timeslot. Unused a, b, c, d,
bits are assigned a sequence of 1, 1, 0, 1.
Parameter 2W 4W
RX Level -2~7.5 dBr +7~16 dBr
TX Level 0~5 dBr -16 dBr
Adjustable by step 0.5 dB
End-to-End Return
Loss 300 ~ 600 Hz:
> 12 dB
600 ~ 3400 Hz
:
> 15 dB
300 ~ 3400 Hz :
> 20 dB
Attenuation/Frequency
Distortion Please refer to
Figure 11-A Please refer to
Figure 11-E
Group Delay Distortion
with Frequency Pleas refer to
Figure 11-B Please refer to
Figure 11-F
Idle Channel Noise
< -65 dBm0p
Weighed Noise:
≤ -65dBm0p
Single Tone:
Noise:
≤ -50dBm0p
Signal-to-Total
Distortion Ratio Please refer to Figure 11-C
Gain Variation of Input
Signal Level Please refer to Figure 11-D
Interchannel Crosstalk
< -65 dBm0 (Input test signal is 1020
Hz, 0dBm0)
Spurious In-band
Signals Less than -40 dBm0
Link Performance
(Table 11-G)
Spurious Out-band
Signals Less than -25 dBm0