Page158 of 544 Transmissionparameters
553-3011-100 Standard14.00 January 2002
Absolute group delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Group delay distortio n . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Longitudinal balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Introduction
The Meridian 1 Option 11C system accommodates two companding laws to
convert signals from analog to digital and from digital to analog:
•µ-Law which is used in North America and Japan.
•A-Law which is used in most other areas of the world, including Europe.
The following transmission specification applies to both standard µ-Law and
A-Law cards. There are other countries which have their own transmission
plans and thus use unique cards which have had adjustments made to
accommodate their tran smission specificat ions. These adjustm ents were
generally in A/D and D/A gains.
The transmission characteristics are given in the following section. Except
where indicated otherwise, the design objectives given are met when
measured between 2 wire and 4 wire analog input and output interfaces
terminated with their nominal impedance.
IMPORTANT
The reference frequency for µ-Law is 1024 Hz and A-Law is 820 Hz.
The reference level is -10 dBmO (as an alternative a reference level of
0 dBmO may be used).