Operator`s manual

Model VR240 Audio Logging Recorder
2-18
January 2000
TIP RING
CH 8
TIP RING
CH 7
TIP RING
CH 6
TIP RING
CH 5
TIP RING
CH 4
TIP RING
CH 3
TIP RING
CH 2
TIP RING
CH 1
Pin 1 Pin 16
2-8.1 Connecting the Telephone Channel Inputs.
The connector comes with mating plugs. The mating plugs use crimp type screw terminals to
secure the telephone lines (wires). The input impedance is 10kΩ. Looking at the rear of the
unit, each 16-position connector is numbered as follows:
01 Line 8 “tip”
02 Line 8 “ring”
03 Line 7 “tip”
04 Line 7 “ring”
05 Line 6 “tip”
06 Line 6 “ring”
07 Line 5 “tip”
08 Line 5 “ring”
09 Line 4 “tip”
10 Line 4 “ring”
11 Line 3 “tip”
12 Line 3 “ring”
13 Line 2 “tip”
14 Line 2 “ring”
15 Line 1 “tip”
16 Line 1 “ring”
2-8.2 Connecting the Audio Channel Inputs.
There is one 50-position socket on the rear panel of each audio input board. The sockets are
the industry standard telephone type, compatible with the Amphenol 57-series (“blue ribbon”)
connectors. Looking at the rear of the unit, each 50-position socket is numbered as follows:
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01
50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26
For each of the eight channels on an input board, there are six signals available at the 50-
position socket: two signals for differential audio input, one for audio output, one for squelch or
record enable control, and two grounds. If there are three input boards installed, the top board
contains channels 1-8, the middle board contains channels 9-16, and the bottom board contains
channels 17-24. Standard 25-pair color-coded cables may be used for system connections
according to the following table 2-1:
1 25
2650
pin 1pin 25
pin 50 pin 26