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BRTS-100 ISDN TEST SET
4.5 Passive Bus—Check Terminations
When you’re using a passive-bus configuration, it’s imperative that the last
device on the bus be terminated at 100 ohms. The other devices on the bus
must be left unterminated. Termination should be an option on each ISDN
terminal. Refer to your terminal’s user manual to determine how to
configure the terminal in terminated/unterminated mode.
See Figure 4-7 for an outline of the functions performed in this test.
Figure 4-7. Passive bus flow chart.
TEST STATUS?
GRN
TERMINAL SHOULD
BE TERMINATED
PUT CIRCUIT IN
CONFIG. 3, POWER
DOWN TERMINAL
IMPEDANCE
TERMINATE
DEVICE
IS TERMINAL
LAST DEVICE?
GRN
TEST STATUS?
RED
PB1
GO TO FIRST
DEVICE ON BUS
ALL
DEVICES
PROPERLY
TERMINATED
TERMINAL SHOULD
NOT BE TERMINATED
PUT CIRCUIT IN
CONFIG. 3, POWER
DOWN TERMINAL
NO YES
IMPEDANCE
DEVICE PROPERLY
TERMINATED
UNTERMINATE
TERMINAL
POWER UP
TERMINAL, GO TO
NEXT DEVICE
ON BUS
PASSIVE BUS CONFIGURATION
CHECK TERMINATIONS
BRTS-100 should be in NORMAL
mode
RED
Passive Bus Configuration
Check Terminations
Test Set should be in NORMAL mode