Position Function
0 External clock is selected (slave)
1 External clock is selected and inverted (slave)
2 Internal clock is selected (master)
3 Internal clock is selected and inverted (master)
4–7 Reserved for future use
8–15 Reserved for factory testing
Back-to-back testing
When performing back-to-back testing with G.703 ports directly connected, one
transceiver 21-216 is set as a master (internal clock).
5.4.4 Power-up and LED statuses with transceiver 21–216
GUID-13DA5C8C-39C3-4643-87BF-31B9428DF496 v1
To power up transceiver 21–216, connect the power cord to the transceiver, and
then connect the other end of the cord to mains. If the link does not work, try to
cross-connect the fibre at one end.
There are 12 LED indicators on the front panel.
IEC07000254 V1 EN-US
Figure 68: Front panel LEDs
LED name
LED function
Power Green LED is lit when power is connected to the unit.
CHANNEL Yellow LEDs represent the channel chosen by jumpers at installation. The channel
is calculated by summing up lit CHANNEL LEDs. For example, if CHANNEL 1 and
CHANNEL 2 are lit (1+2 = 3), channel 3 is chosen. This means that data to/from
the G.703 co-directional port is sent and received via C37.94 protocol on the fiber.
RA
Remote Alarm. Red LED indicates that the remote unit has detected a fault
condition, and has set the Yellow Alarm bit in the C37.94 protocol.
LA Local Alarm. Red LED indicates that transceiver 21-216 has detected a fault
condition in the C37.94 protocol (LOS = Loss Of Signal). The Yellow Alarm bit is
set in the outgoing C37.94 protocol.
ERR
Error. Red LED indicates that transceiver 21-216 has detected an internal error or
that a non-allowed setting of jumpers exists. The ERR led also lits when a non-
used channel is selected or if both codirectional and fiber clocks are selected.
LF
Link Fibre. Green LED indicates that transceiver 21-216 is receiving the correct
C37.94 frames (no LOS).
Section 5 1MRK 505 382-UEN B
Communication set-up
82 Communication set-up 670/650 series 2.2
Application Guide
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