5
IT-7304-PC bottom coded switch
：
Bottom Coded Switch
After time slot 0 is valid, other coded switches in whatever positions are all valid.
Select the number of time slots according to the expected rate. Normally for an independent
type, a time slot setting of automatic tracking Central Site module is selected. Coded switches
of plate-clip time slot correspond to S1, S2, S3 and S4.
Rear Panel of IT-7304-PC/DC
48V DC
：
DC -48V power supply connector
The others are the same as AC Rear Panel
4.3 Front/Rear panels of Rack-mountable casing:
RACK front panel
：
Front Panel of RACK
+5V: 5V main power supply indicator lamp
+12V: 12V fan power supply indicator lamp
Under the panel is a group of indicator lamps matrix:
PWR: power supply lamp
RXD: lightening upon data receiving at V.35
TXD: lightening upon data sending from V.35
LOS: lightening when the optic line gets lost
LOF: lightening after a synchronization of data out-of-frame
TEST: lightening during loopback test (equivalent to LOOP)
PTOK: lightening after a successful pseudo-random code test
