beautypg.com

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

Page 240

background image

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

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