Avaya Definity SI Maintenance Manual page 58

Maintenance Architecture
Table 1-14 lists the quantization distortion loss in the system for analog port to
digital port and digital port to analog port.
Table 1-14. Quantization Distortion Loss
Analog Port-to-Digital Port or Digital Port-to-Analog Port
Signal Level
0 to -30 dBm0
-40 dBm0
-45 dBm0
Terminating Impedance: 600 Ohms nominal
Trunk balance impedance (selectable): 600 Ohms nominal or complex Z [350 Ohms + (1 k
Ohms in parallel with 0.215uF)]
Impulse Noise
On 95% or more of all connections, the impulse noise is 0 (hits) in five minutes at
+55 dBrnC (decibels above reference noise with C-filter) during the busy hour.
ERL and SFRL Talking State
Echo-Return Loss (ERL) and Single-Frequency Return Loss (SFRL) performance
is usually dominated by termination and/or loop input impedances. The system
provides an acceptable level of echo performance if the ERL and SFRL are met.
Station-to-station
Station to 4-wire trunk connection
Station to 2-wire trunk connection
4-wire to 4-wire trunk connection
1-22 Issue 4 May 2002
Distortion Loss
>35 dB
>29 dB
>25 dB
ERL should meet or exceed 18 dB
SFRL should meet or exceed 12 dB
ERL should meet or exceed 24 dB
SFRL should meet or exceed 14 dB
ERL should meet or exceed 18 dB
SFRL should meet or exceed 12 dB
ERL should meet or exceed 27 dB
SFRL should meet or exceed 20 dB
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