Instruction manual

Table 3-1. DV-MUX3 Controls and Indicators
Item Control or Indicator Function
1 PWR indicator Lights when the DV-MUX3 is powered
2 TEST indicator Lights steadily when a BERT test, tone injection, or a remote
loop is active on the DV-MUX3.
Flashes (0.5 second on/0.5 second off) when a configuration
error occurs
3 SYNC LOSS indicator Lights when the DV-MUX3 is not frame-synchronized
4 TD indicator Lights to indicate the presence of data on the transmit pair of the
channel selected by means of the SELECT switch (item 6)
5 RD/ER indicator During normal operation, lights steadily to indicate the presence
of data on the receive pair of the channel selected by means of
the SELECT switch (item 6)
During BERT testing, lights when errors are detected.
6 SELECT switch Selects a channel for testing (by means of the PATT and RLB
push-buttons, items 7 and 8) and for monitoring (by the TD and
RD indicators, items 4 and 5):
D Data channel
L Main link
V Voice channel
7 PATT push-button Activates the transmission of a 511-bit pseudo-random test
sequence on the data channel, and the detection of errors in the
received sequence (BERT testing), or the tone injection
(1000 Hz, 0dBm0) on the voice channel(s).
This function can be disabled by an internal switch
8 RLB push-button Controls the activation of a remote loop on the channel selected
by the SELECT switch (item 6).
This function can be disabled by an internal switch
Special Diagnostic
Indications
In addition to the basic indications listed in Table 3-1, additional fault conditions
can be indicated. The indications used for these conditions are combinations of dis-
play states based on simultaneous lighting of SYNC LOSS and the flashing of the
TEST indicator, and a specific state of the TD and RD/ERR indicators. The avail-
able indications are as follows:
TD and RD/ER
both ON
Failure in power-up self-test (EPROM checksum or the inter-
nal hardware test failed), or the voice channels module is not
installed. The DV-MUX3 should be repaired.
TD and RD/ER
both OFF
The DV-MUX3 main link interface does not receive clock sig-
nals, or the main link clock rate measured by the DV-MUX3
does not fit any of the supported rates, or the rate is outside the
allowable accuracy limits.
CHAPTER 3 - OPERATING INSTRUCTIONS
3-2 DV-MUX3 Installation and Operation Manual