V.35 Fiber Modem Installation and Operation Manual
Page 5 of 13
Front/Rear Panels of V.35 Fiber Modem
POWER
：
Power supply indicator lamp. Constantly lightening after the machine is
turned on.
RXD
：
Data receiving indictor lamp at V.35 interface. Flash indicates that there is
data output from V3.5 interface. The quicker it flashes, the higher rate of
data output from V3.5interface.
TXD
：
Data sending indictor lamp at V.35 interface. Flash indicates that there is data
input to V3.5 interface. The quicker it flashes, the higher rate of data input
to V3.5interface
LOF
：
E1 Alarm indicator lamp of input signal out-of-frame in optic line. Constantly
lightening indicates the alarm with local device; flash indicates the alarm
with opposite device. Alarm status of opposite device can be detected only
at framing mode.
LOS
：
E1 Alarm indicator lamp for code missing in optic line. Constantly lightening
indicates the alarm with local device. Flash indicates the alarm with
opposite device.
LOOP
：
Indicator lamp of loopback test status. When local device is at a loopback
status, the lamp flashes. When local device is not at a framing mode, it is
unable to detect whether opposite device is at a loopback test status.
PTOK
：
Indicator lamp of pseudo-random code test. When the device is at a
loopback status, pseudo-random code test can be made. If this lamp is
constantly lightening, it indicates that pseudo-random code passes the test.
V.35 Fiber Modem/AC rear panel
：
V.35 Fiber Modem/AC Rear Panel Schematic
220V AC
：
AC power jack.
OFF ON
：
Power switch. When the ON button is pressed down, the power supply is
turned on.
V.35: V.35 interface, with a M34 cored jack.
TX RX : Receiving/sending jack of optical fiber, with TX as the sending terminal and
LOOP
PTOK
FIBER MODEM
V35
POWER
TEST
LOOP
PTOK
V.35
LOF
LOS
E1
TXD
RXD
V.35 -DCE
220V AC
OFF ON
TX
RX
V.35 -DCE
V.35 -DCE
220V AC
OFF ON
TX
RX
TX
RX
1 2 3 4 5 6 7 8
ON
T
IM
_
M
O
D
1
L
L
O
O
P
ON
T
IM
_
M
O
D
0
T
IM
_
M
A
S
K
V
3
5
_
R
C
L
K
O
F
F
O
F
F
O
F
F
O
F
F
D
L
O
O
P
R
L
O
O
P
P
A
T
T
