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20
BRTS-100 ISDN TEST SET
Figure 4-5. Check power flow chart.
4.4 Check Loop
This procedure checks for physical impairments in the S/T interface. See
Figure 4-6 for an outline of the functions performed during this test. Before
implementing this procedure, you must meet the following prerequisites:
The terminal should be receiving proper power (see CHECK POWER,
page 14).
LINE TEST should fail.
PHANTOM
LIGHT?
AUX LIGHT?
PUT CIRCUIT IN
POINT TO POINT
CONFIG. (CONFIG. 1)
DOES
TERMINAL
NEED PHANTOM
POWER?
YES
NO
BATTERY
FROM NT1
NO
CHECK POWER
TX & RX
PAIRS
TRANSPOSED
DOES
TERMINAL NEED
PS2 POWER?
POWER OK
NO
BATTERY
ON PINS
7 & 8
WIRES
ON PINS 7
& 8 ARE
CROSSED
RED
GRN
NONE
NO
YES
GRN
RED
NONE
CHECK POWER
If the terminal requires power from the line,
this procedure will verify that power is being
transmitted properly. Assumes the Test Set
is in NORMAL mode.