Zyxel-communications Multi-service Access Platform MSAP2000 Manual de usuario descargar pdf (Pagina 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) 600Ω

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

1 2 ... 235 236 237 238 239 240 241 242 243

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