4 Switch Interface Administration

Digital Interfaces

Up to 13 PRI T1 circuit cards can have a D-channel. The voice system supports up to 13 23B+D interfaces (each with its own D-channel and each set to Yes in this field) or up to 311 B+D (where one card has the D- channel and the other twelve cards are controlled by that D-channel and are set to No in this field since they do not have a D-channel). The system also supports configurations with 2 to 12 D-channels. Typically, each E1 PRI interface has its own D-channel and the system supports up to three 30B+D interfaces.

6Enter the volume adjustment for all incoming speech on circuit cards in the Incoming Speech Volume: field. Valid values are 0 to 32000. Note that values less than 100 or greater than 8000 may distort the incoming speech. The default is 1414.

Any adjustment occurs before the system processes the incoming speech for coding it later for playback. The value in the Incoming Speech Volume: field represents a gain applied to the speech input using a logarithmic scale. A value of 1000 equals no gain; that is, the input is coded at the same level as it is received. Multiplying by 1.414 (the square root of 2) approximately doubles the input volume, or increases it by 3 dB. Therefore, a value of 1414 in the field doubles the volume of incoming speech before it is coded, 2000 doubles it a second time, 2828 doubles it a third time, and so on.

UCS 1000 R4.2 Administration 585-313-507

Issue 3 April 2000 178