ZDO Corporation

Software Consulting since 1998

Monday, January 1. 2007

Telephony Posted by Onur Cinar in Telephony

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Talker Echo Loudness Rating

Talker Echo Loudness Rating (TELR) is total echo loss from receiver to sender.

TELR = SLR + RLR + R + T + Lr

  • SLR: Speaker Loudness Rating. 2db minimum, 7db nominal.
  • RLR: Receiver Loudness Rating. 1db minimum, 3db nominal.
  • R: Receiver Loss. 6db in most calls in U.S.
  • T: Transmit Loss. 6db in most calls in U.S.
  • Lr: Return Loss (Hybrid balance). 8db minimum, 14db nominal.
  • TELR: 17db minimum, 30db nominal (worst).

It increases with delay.


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