BusinessPhone Communication Platform 4.0
Commands > Commands 2000...2999

## 2720
The transmission matrix

The function of the command is to define the transmission matrix.

The transmission matrix shows by how many dB the relative level of an interface listed in column 1 will be adjusted, if this interface is in speech connection with an interface of transmission group 1-7.

Each element in the matrix includes 2 values. The “S” value is added to the relative sending level (the initial value is defined by command 0141 Relative sending level for the ELU and by command 1610 Relative sending level for the BTU). The “R” value is added to the relative receiving level (the initial value is defined by command 0142 Relative receiving level for the ELU and by command 1611 Relative receiving level for the BTU).

The command 0140 Transmission group defines for ELUs to which transmission group of the transmission matrix the extension belongs. The command 1612 Transmission group defines for BTUs to which transmission group of the transmission matrix the external line belongs.

Usually the transmission groups are used as follows:

0 = |  | Initial value, used for all types of ELUs, BTU-A on short trunk lines BTU-D

1 = |  | BTU-A on medium trunk lines

2 = |  | BTU-A on long trunk lines

3 = |  | 2-wire tie lines (BTU-C, BTU-E)

4 = |  | 4-wire tie lines (BTU-E)

5-6 = |  | Reserved for special market requirements

7 = |  | No transmission adaptation

Interfaces are able to adjust the relative levels within the range of -12 dBr and +6 dBr in steps of 0.1 dB. If the corrected value is outside of this range, the nearest possible value will be used and a warning will be generated.

Minimum required authority level from telephone: No

Accessible via BMS: Yes

Revision: A © Ericsson Enterprise 2003