V.35 Fiber Modem Installation and Operation Manual
Page 7 of 13
4.3 Front and rear panels of Rack-mountable casing
RACK front panel
：
RACK Front Panel
+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
；
RACK rear panel
：
RACK Rear Panel
This panel is composed of three small panels, as described below
：
V.35 Fiber Modem module panel
：
V.35 Fiber Modem Module Panel
RACK/AC AC redundancy power supply panel
：
PWR
RXD
TXD
LOS
LOF
TES
T
PTO
K
