3One data 7304 User manual

MODEL7
MODEL7
MODEL7
MODEL7 304
304
304
304
V.35
V.35
V.35
V.35 Optic
Optic
Optic
Optic Fiber
Fiber
Fiber
Fiber Modem
Modem
Modem
Modem
User
User
User
User Manual
Manual
Manual
Manual
Shenzhen
Shenzhen
Shenzhen
Shenzhen 3onedata
3onedata
3onedata
3onedata Technology
Technology
Technology
Technology Co.,Ltd
Co.,Ltd
Co.,Ltd
Co.,Ltd
Tel : [phone] Fax : [phone]
www.3onedata.com
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MODEL7304 User Manual
Page
2
of
11
Contents
Contents
Contents
Contents
1.
1.
1.
1. Introduction
Introduction
Introduction
Introduction .......................................................................................................................................... 3
2.
2.
2.
2. Product
Product
Product
Product Features
Features
Features
Features ............................................................................................................................... 3
3.
3.
3.
3. Specifications
Specifications
Specifications
Specifications ..................................................................................................................................... 3
4.
4.
4.
4. Description
Description
Description
Description on
on
on
on Installation
Installation
Installation
Installation and
and
and
and Panels
Panels
Panels
Panels .................................................................................. 4
4.1
4.1
4.1
4.1 Unpacking:
Unpacking:
Unpacking:
Unpacking: ..................................................................................................................................... 4
4.2
4.2
4.2
4.2 Front/Rear
Front/Rear
Front/Rear
Front/Rear panels
panels
panels
panels of
of
of
of the
the
the
the stand
stand
stand
stand alone
alone
alone
alone device:
device:
device:
device: ....................................................................... 4
4.3
4.3
4.3
4.3 Front/Rear
Front/Rear
Front/Rear
Front/Rear panels
panels
panels
panels of
of
of
of Rack-mountable
Rack-mountable
Rack-mountable
Rack-mountable casing:
casing:
casing:
casing: ..................................................................... 6
5.
5.
5.
5. MODEL7304
MODEL7304
MODEL7304
MODEL7304 Application
Application
Application
Application ................................................................................................................ 7
5.1
5.1
5.1
5.1 Definition
Definition
Definition
Definition of
of
of
of signal
signal
signal
signal lines
lines
lines
lines at
at
at
at V.35
V.35
V.35
V.35 interface
interface
interface
interface ............................................................................. 7
5.1.1
5.1.1
5.1.1
5.1.1 Distribution
Distribution
Distribution
Distribution diagram
diagram
diagram
diagram of
of
of
of guiding
guiding
guiding
guiding feet
feet
feet
feet on
on
on
on M34
M34
M34
M34 cored
cored
cored
cored jack
jack
jack
jack .................................................. 7
5.1.2
5.1.2
5.1.2
5.1.2 Definition
Definition
Definition
Definition of
of
of
of signal
signal
signal
signal lines
lines
lines
lines at
at
at
at V.35
V.35
V.35
V.35 interface
interface
interface
interface ........................................................................... 7
5.2
5.2
5.2
5.2 Standard
Standard
Standard
Standard V.35
V.35
V.35
V.35 crossover
crossover
crossover
crossover cable
cable
cable
cable connection
connection
connection
connection diagram
diagram
diagram
diagram .......................................................... 8
5.3
5.3
5.3
5.3 Sittings
Sittings
Sittings
Sittings of
of
of
of switch
switch
switch
switch and
and
and
and jumper
jumper
jumper
jumper ................................................................................................... 8
5.3.1
5.3.1
5.3.1
5.3.1 Clock
Clock
Clock
Clock setting
setting
setting
setting .......................................................................................................................... 8
5.3.2
5.3.2
5.3.2
5.3.2 Phase
Phase
Phase
Phase selection
selection
selection
selection ....................................................................................................................... 9
5.3.3
5.3.3
5.3.3
5.3.3 Settings
Settings
Settings
Settings of
of
of
of loopback
loopback
loopback
loopback test
test
test
test and
and
and
and pseudo-random
pseudo-random
pseudo-random
pseudo-random code
code
code
code test
test
test
test .................................................... 9
5.3.4
5.3.4
5.3.4
5.3.4 Framing/non-framing
Framing/non-framing
Framing/non-framing
Framing/non-framing and
and
and
and time
time
time
time slot
slot
slot
slot settings
settings
settings
settings .................................................................... 10
6.
6.
6.
6. Common
Common
Common
Common Problems
Problems
Problems
Problems ......................................................................................................................... 11
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MODEL7304 User Manual
Page
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1.
1.
1.
1. Introduction
Introduction
Introduction
Introduction
MODEL7304 is a high-performance V.35 optic fiber modem developed by using a dedicated
integrated circuit. It is to modulate a N × 64K V.35 data signal directly over single- or
multi-mode optic fiber for a transmission via optic cable line. At another end of the optic
cable, optical signal is demodulated into a V.35 data signal. V.35 interface may be directly
connected with the V.35 interfaces of image and data terminals or the WAN ports of MUX,
exchanger and router for a dedicated network setup or a LAN connection.
2.
2.
2.
2. Product
Product
Product
Product Features
Features
Features
Features
�Rate N × 64Kbit/s (N=1 ～32)
�Support the loopback of local analog/digital interface
�Support remote loopback function
�Support pseudo-random code test function
�120km trunking -free transmission distance for single-mode optic fiber
�Capable to be communicated with FE1 Fiber Modem
�Available with complete line detection and alarm indications
�
Available with independent structure and 19-inch Rack-mountable structure
Rack-mountable structure can be inserted with 16 modules
�
AC 220V and DC – 48V inputs may be selected for fiber optic modems of both structure
�
For Rack-mountable fiber optic modems, dual power supply heat backup is provided to
ensure a high operating reliability
3
3
3
3 .
.
.
. Specification
Specification
Specification
Specification s
s
s
s
Optic
Optic
Optic
Optic interface:
interface:
interface:
interface:
�Line mode type : CMI
�Line mode rate : 2.048Mbps
�Operating wavelength : 850nm,1310nm or 1550nm
�Optic fiber connector : SC/PC
�Applicable optic fiber : multi-mode, single-mode
�Transmission distance :
Single-mode : up to 120km Multi-mode: up to 2km
V.35
V.35
V.35
V.35 interface
interface
interface
interface ：
�Data rate : N × 64Kbps （N=1~32 ）
�Available with CTS/RTS (Hardware) flow control function
�Type of connector : M34 connector
�Operating mode: DCE
Indicator lamps : To indicate the operating status of power supply, data receiving/sending,
loopback and random code test, code missing alarm, out-of-frame alarm
etc.
Structure
Structure
Structure
Structure
：
Independent : 140mm(depth) x 210mm(width) x 42mm(height)
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Rack-mountable : 19in 4.5U standard casing
Power
Power
Power
Power supply
supply
supply
supply
：
Independent : 85V
～
264V AC input, 5V/2A output
-36V ～-72V DC input , 5V/2A output
Rack-mountable : 150V ～260V AC input , 5V/16A , 12V/1A output
-38V ～-58V DC input , 5V/16A , 12V/1A output
Power consumption : 3W
Operating temperature : 0 ° C
～
50 ° C
Storage temperature : -20 ° C
～
80 ° C
Humidity : 5%
～
90% (free of condensate)
4.
4.
4.
4. Description
Description
Description
Description on
on
on
on Installation
Installation
Installation
Installation and
and
and
and Panels
Panels
Panels
Panels
4
4
4
4 .1
.1
.1
.1 Unpacking
Unpacking
Unpacking
Unpacking :
:
:
:
After the equipment is unpacked, a check shall be done for the completeness. If any part
is found missing, please immediately contact our representative offices or agents. Complete
packing shall include the following items (for an independent product):
�One set of V.35 Fiber Modem MODEL7304
�One V.35 Fiber Modem Operation Manual
�
One power line ( V.35 Fiber Modem/AC )
Please also contact our representative offices or agents for any transportation damage
found with this product.
4
4
4
4 .
.
.
. 2
2
2
2 Front/Rear
Front/Rear
Front/Rear
Front/Rear panels
panels
panels
panels of
of
of
of the
the
the
the stand
stand
stand
stand alone
alone
alone
alone device
device
device
device :
:
:
:



F
F
F
F ront
ront
ront
ront panel
panel
panel
panel
：
Front
Front
Front
Front Panel
Panel
Panel
Panel of
of
of
of MODEL7304
MODEL7304
MODEL7304
MODEL7304
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
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MODEL7304 User Manual
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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.



R
R
R
R ear
ear
ear
ear panel
panel
panel
panel ：
Rear
Rear
Rear
Rear Panel
Panel
Panel
Panel of
of
of
of MODEL7304
MODEL7304
MODEL7304
MODEL7304 /AC
/AC
/AC
/AC
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 RX as
the receiving terminal.
There is a coded switch S5 on the panel, which is used as the system configuration switch
to set such functions as clock, time slot, phase, loopback and pseudo-random code test etc.
Wherein, S5.1 and S5.2 are clock settings.
S5.1
＝
OFF, S5.2=OFF
：
network clock at V.35 interface(Received Recovered).
S5.1
＝
OFF
，
S5.2
＝
ON
：
network clock at the optic fiber interface (Received Recovered).
Remote time slot setting can be tracked only at this status.
S5.1=ON, S5.2=OFF: invalid
S5.1
＝
ON
，
S5.2
＝
ON
：
using local crystal OSC generating clock
S5.3: time slot setting
S5.3 ＝OFF ，using remote time slot setting (valid only when S5.1 ＝OFF ，S5.2 ＝ON)
S5.3 ＝ON ，using local time slot setting
S5.4: for V.35 receiving clock phase selection
S5.4=OFF, using positive phase
S5.4=ON, using negative phase
S5.5: Local loopback setting (optic interface in direct loopback), ON valid.
S5.6: Local digital loopback (V.35 interface loopback), ON valid.
S5.7: Remote digital loopback (V.35 interface loopback), ON valid.
Valid at framing mode (0 time slot unused).
S5.8: Pseudo-random code test, ON valid, and valid at loopback status.



MODEL7304
MODEL7304
MODEL7304
MODEL7304 bottom
bottom
bottom
bottom coded
coded
coded
coded switch
switch
switch
switch ：
B
B
B
B ottom
ottom
ottom
ottom Coded
Coded
Coded
Coded Switch
Switch
Switch
Switch
After time slot 0 is valid, other coded switches in whatever positions are all valid.
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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
Rear
Rear
Rear Panel
Panel
Panel
Panel of
of
of
of MODEL7304
MODEL7304
MODEL7304
MODEL7304 /DC
/DC
/DC
/DC
48V DC ：DC -48V power supply connector
The others are the same as AC Rear Panel
4
4
4
4 .
.
.
. 3
3
3
3 Front/Rear
Front/Rear
Front/Rear
Front/Rear panels
panels
panels
panels of
of
of
of Rack-mountable
Rack-mountable
Rack-mountable
Rack-mountable casing
casing
casing
casing :
:
:
:




RACK
RACK
RACK
RACK front
front
front
front panel
panel
panel
panel
：
Front
Front
Front
Front Panel
Panel
Panel
Panel of
of
of
of RACK
RACK
RACK
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



RACK/AC
RACK/AC
RACK/AC
RACK/AC AC
AC
AC
AC redundancy
redundancy
redundancy
redundancy power
power
power
power supply
supply
supply
supply panel
panel
panel
panel
：
RACK/AC
RACK/AC
RACK/AC
RACK/AC AC
AC
AC
AC Redundancy
Redundancy
Redundancy
Redundancy Power
Power
Power
Power Supply
Supply
Supply
Supply Panel
Panel
Panel
Panel
160~270 VAC
：
AC 220V input jack
ON OFF
：
power switch
+5V ：5V main power supply indicator lamp ；
+12V ：12V fan power supply indicator lamp
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


RACK/DC
RACK/DC
RACK/DC
RACK/DC DC
DC
DC
DC redundancy
redundancy
redundancy
redundancy power
power
power
power supply
supply
supply
supply panel
panel
panel
panel ：
RACK/DC
RACK/DC
RACK/DC
RACK/DC DC
DC
DC
DC Redundancy
Redundancy
Redundancy
Redundancy Power
Power
Power
Power Supply
Supply
Supply
Supply Panel
Panel
Panel
Panel
40~60 VDC
：
DC-48V input connector (FG grounded, with “ - + ” terminals connected with
48V input)
ON OFF
：
power switch
+5V
：
5V main power supply indicator lamp
+12V ：12V fan power supply indicator lamp
5
5
5
5 .
.
.
. MODEL7304
MODEL7304
MODEL7304
MODEL7304 Application
Application
Application
Application
5.1
5.1
5.1
5.1 Definition
Definition
Definition
Definition of
of
of
of signal
signal
signal
signal lines
lines
lines
lines at
at
at
at V.35
V.35
V.35
V.35 interface
interface
interface
interface
5.1.1
5.1.1
5.1.1
5.1.1 Distribution
Distribution
Distribution
Distribution diagram
diagram
diagram
diagram of
of
of
of guiding
guiding
guiding
guiding feet
feet
feet
feet on
on
on
on M34
M34
M34
M34 cored
cored
cored
cored jack
jack
jack
jack
Distribution
Distribution
Distribution
Distribution diagram
diagram
diagram
diagram of
of
of
of guiding
guiding
guiding
guiding feet
feet
feet
feet on
on
on
on M34
M34
M34
M34 cored
cored
cored
cored jack
jack
jack
jack
5.1.2
5.1.2
5.1.2
5.1.2 Definition
Definition
Definition
Definition of
of
of
of signal
signal
signal
signal lines
lines
lines
lines at
at
at
at V.35
V.35
V.35
V.35 interface
interface
interface
interface
As shown :( Operating mode ：DCE )
Definition
Definition
Definition
Definition of
of
of
of Signal
Signal
Signal
Signal Lines
Lines
Lines
Lines at
at
at
at V.35
V.35
V.35
V.35 Interface
Interface
Interface
Interface
V.35 Feet Signal Function Direction
A CGND Frame ground ——
B GND signal ground ——
C RTS request to send input
D CTS consent to send output
E DSR data set ready output
F DCD data carrier detection output
H DTR data terminal ready input
P TXD A
transmitting data
line A
input
S TXD B
transmitting data
line B
input
R RXD A receiving data line A output
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5.2
5.2
5.2
5.2 Standard
Standard
Standard
Standard V.35
V.35
V.35
V.35 crossover
crossover
crossover
crossover cable
cable
cable
cable connection
connection
connection
connection diagram
diagram
diagram
diagram
V.35 feet V.35 feet
CGND A ————— A CGND
GND B ————— B GND
RTS C ————— D CTS
CTS D ————— C RTS
DSR E ————— H DTR
DTR H ————— E DSR
TXDA P ————— R RXDA
TXDB S ————— T RXDB
RXDA R ————— P TXDA
RXDB T ————— S TXDB
EXCA U ————— V RXCA
EXCB W ————— X RXCB
RXCA V ————— U EXCA
RXCB X ————— W EXCB
5.3
5.3
5.3
5.3 Sittings
Sittings
Sittings
Sittings of
of
of
of switch
switch
switch
switch and
and
and
and jumper
jumper
jumper
jumper
Independent device has totally 5 setting switches, with S5 located on the rear panel and
S1~S4 under the bottom cover. The user can easily make settings without the need to open the
cover.
5.3.1
5.3.1
5.3.1
5.3.1 Clock
Clock
Clock
Clock setting
setting
setting
setting
V.35 interface timing (S5.1= OFF, S5.2=OFF): the sending timing is V.35 port timing, and
the received data, after buffering, is synchronized with V.35 port timing.
Optic interface receiving timing (optic interface originated from the clock, S5.1=OFF
，
S5.2=ON): the sending timing is optic interface receiving timing, and the received data, after
buffering, is synchronized with optic interface receiving timing. Under this timing mode, local
time slot setting can automatically track the opposite time slot setting.
T RXD B receiving data line B output
U
EXTCLK
A
exterior clock line A input
W
EXTCLK
B
exterior clock line B input
V RXCL A
receiving clock line
A
output
X RXCL B
receiving clock line
B
output
Y TXCL A
transmitting clock
line A
output
AA TXCL B
transmitting clock
line B
output
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Local main timing (S5.1=ON, S5.2=ON): the sending timing is of local crystal OSC, and
the received data, after buffering, is synchronized with local timing.
5.3.2
5.3.2
5.3.2
5.3.2 Phase
Phase
Phase
Phase selection
selection
selection
selection
S5.4 is used for the receiving phase selection of V.35 interface.
5.3.3
5.3.3
5.3.3
5.3.3 Settings
Settings
Settings
Settings of
of
of
of loopback
loopback
loopback
loopback test
test
test
test and
and
and
and pseudo-random
pseudo-random
pseudo-random
pseudo-random code
code
code
code test
test
test
test
S5.5
～
S5.8 of coded switch S5 are used for setting the loopback test and pseudo-random
code test.
S5.5 is local loopback control
（
LLOOP
）
and optic interface is directly looped back to
V.35 interface. “ OFF ” indicates normal operation; “ ON ” indicates local loopback test.
The default is “ OFF ” . It is used for testing whether local device is in normal operation.
Local
Local
Local
Local Loopback
Loopback
Loopback
Loopback Schematic
Schematic
Schematic
Schematic
S5.6: local digital loopback control (DLOOP). “ OFF ” indicates normal operation; “ ON ”
indicates local digital loopback. The default is “ OFF ” . With a loopback from local V.35
interface to E1 optic interface, it is used for testing whether the remote device and E1
optic line are in normal operation.
Local
Local
Local
Local Digital
Digital
Digital
Digital Loopback
Loopback
Loopback
Loopback
S5.7: “ OFF ” indicates normal operation ；“ ON ” indicates command remote loopback. The
default is “ OFF ” . As this command must be sent through E1 optic line to remote end for
validness, it will become invalid at the following two cases:
①
the remote end is not
V.35 Fiber Modem device;
②
V.35 Fiber Modem is working at a non-framing status, at
this moment all time slots of E1 are used for transmitting the data from V.35 interface at
a rate of 2048Kbps. Through a transmission of loopback command from local device to
remote device, the command remote loopback is achieved.
Remote
Remote
Remote
Remote Loopback
Loopback
Loopback
Loopback
S5.8: Pseudo-random code test control (PATT). “ OFF ” indicates normal operation; “ ON ”
indicates pseudo-random sequence test. The default is “ OFF ” . It generates a
pseudo-random sequence code to be transmitted to V.35 optic line output terminal and
tests whether V.35 optic line input signal is in compliance with this sequence standard,
so as to judge whether the device and line transmission have an error code.
V . 35
Fiber Modem V 35
Optical
Interface
Fiber Modem V 35
Optical
Interface
V . 35
Fiber Modem V 35
V . 35
V . 35
Fiber Modem V 35
Fiber Link
Remote
Local
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pseudo-random
pseudo-random
pseudo-random
pseudo-random Code
Code
Code
Code Test
Test
Test
Test
Remark:
Remark:
Remark:
Remark: Pseudo-random sequence code test can be made only under a loopback status. At
this moment, constantly lightening of LOOP and PTOK/CRC lamps shows local status, flash
shows remote status; TXD and RXD lamps are used for showing the status of local TXD or
RXD.
5.3.4
5.3.4
5.3.4
5.3.4 Framing/non-framing
Framing/non-framing
Framing/non-framing
Framing/non-framing and
and
and
and time
time
time
time slot
slot
slot
slot settings
settings
settings
settings
Totally 32 coded switches S1, S2, S3 and S4 are used for E1 time slot setting.
E1
E1
E1
E1 Time
Time
Time
Time Slot
Slot
Slot
Slot Setting
Setting
Setting
Setting
�
1
st
switch (S1.1) is used for controlling E1 framing/non-framing. “ ON ” refers to
non-framing mode.
�
31 switches, from 2
nd
— 32
nd
(S1.2~S1.8, S2, S3, S4), are respectively used for controlling
the selection of 1
st
– 31
st
time slots. Set at “ ON ” , the corresponding time slot is selected;
set at “ OFF ” , the corresponding time slot is not selected. The rate of V.35 interface is
completely dependent on the number of the selected time slots. For example: the setting
of 3
rd
switch to “ ON ” and all other switches to “ OFF ” indicates that 2
nd
time slot is
selected, at this moment the rate is 64K; the setting of 7
th
and 8
th
switches to “ ON ” and all
other switches to “ OFF ” indicates that 6
th
and 7
th
time slots are selected, with a rate of
2 × 64K=128K. TS0 setting is used for specifying E1 frame to be transparent or framing:
“ 0 ” --framing, “ 1 ” --non-framing. But the bit has to be specified in combination with other
time slots. TS16 setting is used for controlling E1 frame structure to be PCM30
（
CAS
）
or PCM31
（
CCS
）
: ‘ 0 ’— PCM30, at this moment 16
th
time slot must not be used for
transmission service; ‘ 1 ’— PCM31, 16
th
time slot can be used for transmission service.
Besides, TS1 — TS31 are respectively used for controlling the selection of 1
st
— 31
st
time
slots: ‘ 1 ’— the corresponding time slot is selected; ‘ 0 ’— the corresponding time slot is not
selected.
�
Typical application
：
Non-framing mode: 1
st
switch is set to “ ON ” , and all other switches
to “ OFF ” (other switches are located in such a way that the setting of non-framing is
unaffected) Framing mode: 1st switch is set to “ OFF ” , and all other switches are set
according to the time slot positions to be used by E1 channel and the rate of V.35 port. (If
it is set to tracking remote time slot, the time slot switch will become invalid)
Attention:
Attention:
Attention:
Attention: Ex-works S1, S2, S3 and S4 are all set to “ OFF ”
Attention:
Attention:
Attention:
Attention: The setting of tracking remote time slot; S5.2 to “ ON ” ; S5.1 and S5.3 to “ OFF ”
V . 35
V . 35
Fiber Modem V 35 Fiber Modem V 35
Local Remote
Fiber Link
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MODEL7304 User Manual
Page
11
of
11
6.
6.
6.
6. Common
Common
Common
Common Problems
Problems
Problems
Problems
Common
Common
Common
Common Failures
Failures
Failures
Failures and
and
and
and Solutions
Solutions
Solutions
Solutions
No. Failure Cause Solution
1 PWR power supply
indicator lamp not
lightening
1.Power supply not properly
connected
2.Protector tube damaged
3. -48V DC input tie-line in
reverse connection
4.Internal power supply circuit
with failure
1.Check power switch and jack
2.Replace protector tube 3.Correct -48V
power supply line connection
4.Returned to the manufacturer for
repair.
2 LOF out-of-frame
alarm lamp lightening
1.Optic interface not clean
2.Optic fiber not well inserted
3.Wrong clock setting
4.Time slots of the devices at
two ends not conformance
5.Internal circuit damaged
1. Clean the connector of optic interface
2. Insert the SC connector in place
3. Refer to the description on rear panel
4. Returned to the manufacturer for
repair.
3 LOS data loss alarm
lamp lightening
1. Optic fiber in wrong
interconnection
2.Optic fiber not well inserted
3.Optic fiber broken
4.Internal circuit damaged
1. Correct the connection
2. Insert the SC connector in place
3. Check optic cable
4. Returned to the manufacturer for
repair.
4 TXD lamp not
lightening
V.35 interface not well
connected or the router etc. not
turned on.
1. Check the connecting line and
terminal device
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