Transmission A-Law And Μ-Law; Loss Plan - Meridian Nortel 1 Option 11C Technical Reference Manual

Transmission A-Law and µ-Law

Loss Plan

Insertion loss
The insertion loss of a private branch exchange (PBX) connection is defined
as the difference between the power delivered from the (test) reference source
into the input port and the power at the output port. For insertion loss tests
both the signal source and the measurement instrument have impedances of
600 ohms. The test frequency is 820 Hz for A-Law and 1024 Hz for µ-Law.
The insertion losses between various Intelligent Peripheral Equipment (IPE)
ports are connection - specific in order to be compatible with end-to-end
network connection loss requirements. The Meridian 1 Option 11C loss
specifications are in agreement with North American standards, which are
formulated to provide satisfactory end-to-end performance for connections
within private networks and between private and public networks.
The loss plan strategy for IPE combines electrical loss with terminal acoustic
parameters for optimum transmission performance. For this reason, some
connections have asymmetrical loss in order to conform with network loss
plans. This asymmetry is resolved at a remote point (another switch) in the
overall connection.
Tables 37, 38, and 39 provide loss values measured in decibels (dB) for
connections between:
• IPE ports (lines and trunks)
• Digital ports (PRI or DTI)
Tables 37, 38, and 39 are in matrix format. Be aware of the direction of
the arrows when searching for a loss value.
Transmission parameters
CAUTION
Option 11C and 11C Mini
Page 159 of 544
Technical Reference Guide