Maintenance Architecture
555-233-143
1-22
Issue 1 May 2002
ERL and SFRL Talking State
Echo-Return Loss (ERL) and Single-Frequency Return Loss (SFRL) performance
are 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,
as follows:.
Peak Noise Level
■
Analog to analog — 20 dBrnC (decibels above reference noise with
C-filter)
■
Analog to digital — 19 dBrnC
■
Digital to analog — 13 dBrnC
Echo Path Delay
■
Analog port to analog port — < 3 ms
■
Digital interface port to digital interface port — < 2 ms
Station-to-station
ERL should meet or exceed 18 dB SFRL
should meet or exceed 12 dB
Station to 4-wire trunk connection
ERL should meet or exceed 24 dB SFRL
should meet or exceed 14 dB
Station to 2-wire trunk connection
ERL should meet or exceed 18 dB SFRL
should meet or exceed 12 dB
4-wire to 4-wire trunk connection
ERL should meet or exceed 27 dB SFRL
should meet or exceed 20 dB
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...