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35
CHAPTER 5: Technical Reference
5. Technical Reference
5.1 Power-Source Indicators
The Phantom Feed light indicates the presence and polarity of battery power.
In NORMal mode, the Test Set verifies that the terminal’s transmit pairs are
positive and its receive pairs are negative. In REVerse mode, the Test Set
verifies that the opposite (transmit negative and receive positive) is true.
See Figure 5-1.
The presence and polarity of Power Source 2 (Auxiliary Power), using pins
7 and 8, can be determined by the AUX LED. Normally, Pin 7 should be
negative and pin 8 should be positive.
The maximum current consumption in Phantom Power (PS1) and
Auxiliary Power (PS2) is approximately 5 mA at 34 VDC and 8.3 mA at 56
VDC.
Figure 5-1. Power source indicators.
POWER SOURCE 1 (PHANTOM FEED)
POWER SOURCE 2 (AUXILIARY POWER)
3
TRANS.
6
5
REC.
4
8
7
3
REC.
6
5
TRANS.
4
8
7
GREEN RED
6.6K
GREEN RED
6.6K
POWER
SOURCE
1
POWER 2
-
+
-
+
PHANTOM
FEED
AUX.
FEED
NETWORK
TERMINAL
POWER FEED 34-56 VPC
CURRENT CONSUMPTION:
APPROX. 5mA @ 34 VDC
APPROX. 8.3mA @ 56 VDC
7' LOOP