2w/4w e&m interface – ZyXEL Communications Multi-service Access Platform MSAP2000 User 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