upcom FE1 User manual

FE1 Fiber Modem
User Manual
Version: 2.0.2
Data: 03.07.2005

FE1 Fiber Modem Installation and Operation Manual
Page 2 of 13
Contents
1. Product Overview.............................................................................................................3
2.Product Features...............................................................................................................3
3.Technical Indexes .............................................................................................................4
4. Description on Installation and Panel ...........................................................................5
4.1 Unpacking.................................................................................................................5
4.2 Front/rear panels of an independent casing...............................................................5
4.3 Front and rear panels of Rack-mountable casing ......................................................7
5. FE1 Fiber Modem Application........................................................................................9
5.1 E1 configuration........................................................................................................9
5.2 Connection the Twisted Pair(120 ohm) to the G.703 Network .................................9
5.3 Sittings of Switch and Jumper ..................................................................................9
5.3.1 Clock setting................................................................................................9
5.3.2 Settings of loop back test and pseudo-random code test ..................10
5.3.3 Framing/non-framing and time slot settings .........................................11
6. Common Problems........................................................................................................12

FE1 Fiber Modem Installation and Operation Manual
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1. Product Overview
FE1 Fiber Modem is a high-performance E1 fiber optic modem developed by
using a dedicated integrated circuit. It is to modulate a framing or non-framing E1
data signal directly into 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
framing or non-framing E1 data signal. E1 interface may be directly connected with
the E1 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.Product Features
Conforms to all relevant ITU series standards( ITU-T G.703 G.704 G.823)
Transmit one E1 channel
Framing or non-framing mode in option
E1 time slot in arbitrary option
Balanced 120Ω/non-balanced 75Ω interfaces automatic
Support the loop back of local analog/digital interface
Support remote loop back function (valid on under framing mode)
Support pseudo-random code test function, providing convenience for the test
of optic fiber line status
120km trunking -free transmission distance for single-mode optic fiber
Capable to be communicated with V.35 fiber modem
Available with complete line detection and alarm indications
Available with independent structure and 19-inch frame-mounted structure
(frame-mounted structure can be inserted with 16 modules);
AC 220V and DC –48V inputs may be selected for fiber optic modems of both
structures;
For frame-mounted fiber optic modems, dual power supply heat backup is
provided to ensure a Receiving level：0~-43db

FE1 Fiber Modem Installation and Operation Manual
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3.Technical Indexes
Optic 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
E1 interface：
Standard：ITU-T G.703 G.704
Frame structure：framing CCS（PCM31）/ CAS（PCM30）
Rate：N×64Kbps （N=1~31）or 2.048Mbps
Impedance：75Ω，physical interface BNC 、120Ω，physical interface RJ45
Code：HDB3
Receiving level：0~-43db
Indicator lamps：
To indicate the operating status of power supply, loopback and random code test,
code missing alarm, out-of-frame alarm etc.
Structure：
Independent：140mm(depth) x 210mm(width) x 42mm(height)
Frame-mounted： 19in 4.5U standard casing
Power supply：
Independent：85V～264V AC input，5V/2A output 、
-36V～-72V DC input，5V/2A output
Frame-mounted：150V～260V AC input，5V/16A 、12V/1A output
-38V～ -58V DC input，5V/16A 、12V/1A output
Power consumption： 3W
Operating temperature： 0℃～50℃
Storage temperature： -20℃～80℃
Humidity： 5%～90% (free of condensate)

FE1 Fiber Modem Installation and Operation Manual
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4. Description on Installation and Panel
4.1 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 FE1 Fiber Modem
One FE1 Fiber Modem Operation Manual
One power line（FE1 Fiber Modem /AC）
A couple of BNC connectors
Please also contact our representative offices or agents for any transportation
damage found with this product.
4.2 Front/rear panels of an independent casing
FE1 Fiber Modem front panel：
Front panels of FE1 Fiber Modem
POWER：Power supply indicator lamp. Constantly lightening after the machine is
turned on.
E1 LOF：Alarm indicator lamp for input signal out-of-frame in E1 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.
E1 LOS：Alarm indicator lamp for code missing in E1 line. Constantly lightening
indicates the alarm with local device.
FO LOF：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.
POWER
TEST
LOOP PTOK/CRCLOF LOS
E1
LOF LOS
FO
FIBER MODEM
FE1
POWER
TEST
LOOP PTOK/CRCLOF LOS
E1
LOF LOS
FO

FE1 Fiber Modem Installation and Operation Manual
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FO LOS：Alarm indicator lamp for code missing in optic line. Constantly lightening
indicates the alarm with local device.
LOOP：Indicator lamp of loopback test status. When local device is at a loopback
status, the lamp is constantly lightening; when opposite 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/CRC：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.
FE1 Fiber Modem/AC rear panel：
FE1 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.
E1-75Ω TX／RX：Receiving/sending jack of 75ΩBNC interface in E1.
E1-120Ω： Jack of 120Ω RJ45 interface in E1.
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.
S5.2＝OFF：network clock at E1 interface(Received Recovered) (S5.1 in whatever
status)
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＝ON：using local crystal oscillation 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
220V AC OFF ON
TX RX
E1-75?
TX RX
E1-120?
220V AC OFF ON
TX RXTX RX
E1-75?
TX RX
E1-120?
E1-75?
TX RX
E1-120?
1 2 3 4 5 6 7 8
ON
PATT OFF
OFF OFF OFF
ON
RLOOP
DLOOP
LLOOP
TIM_MOD1
TIM_MOD0
TIM_MASK

FE1 Fiber Modem Installation and Operation Manual
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S5.4: Reserved
S5.5: Local loopback setting (optic interface in direct loopback), ON valid.
S5.6: Local digital loopback (E1 interface loopback), ON valid.
S5.7: Remote digital loopback (remote optic 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.
FE1 Fiber Modem bottom coded switch：
FE1 Fiber Modem 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.
FE1 Fiber Modem/DC rear panel：
FE1 Fiber Modem/DC Rear Panel Schematic
48V DC：–48Vdc input jack
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；
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
E1 TS 0 7 15 23 31
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
E1 TS 0 7 15 23 31
TX RX
E1-75?
TX RX
E1-120?
TX RXTX RX
E1-75?
TX RX
E1-120?
E1-75?
TX RX
E1-120?
1 2 3 4 5 6 7 8
ON
PATT OFF
OFF OFF OFF
ON
RLOOP
DLOOP
LLOOP
TIM_MOD1
TIM_MOD0
TIM_MASK
48 V DC
FG - +
48 V DC
FG - +
OFF ON
OFF ON
PWR
RXD
TXD
LOS
LOF
TES
T
PTO
K

FE1 Fiber Modem Installation and Operation Manual
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RXD : lightening upon data receiving；
TXD : lightening upon data sending；
LOS : lightening when either optic line or E1 line gets lost ；
LOF : lightening after a synchronization of data out-of-frame；
TEST: lightening during loopback test；
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：
FE1 Fiber Modem module panel：
FE1 Fiber Modem Module Panel
RACK AC redundancy power supply panel：
RACK AC Redundancy Power Supply 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
RACK DC redundancy power supply panel：
RACK DC Redundancy Power Supply Panel
40~60 VDC：DC-48V input connector (FG grounded, with“- +” terminals connected
I O
I O
O I
160-270 VAC
OFF
ON
+5V +12V
I O
40-60 VDC
OFF
ON
+5V +12V
FG -+

FE1 Fiber Modem Installation and Operation Manual
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with 48V input)
ON OFF： power switch
+5V： 5V main power supply indicator lamp;
+12V： 12V fan power supply indicator lamp
5. FE1 Fiber Modem Application
5.1 E1 configuration
The device support two physical match impedance of the E1 interface, which can
automatics 120ohm balanced twisted-pair and 75ohm non-balanced coaxial cable
interface. Users can select the appropriate interface to connection dispense with any
operation.
5.2 Connection the Twisted Pair(120 ohm) to the G.703
Network
As shown, 1 and 2 are sending lines, 4 and 5 are receiving lines.
Line Sequence of Balanced Twisted-Pair at E1 Interface RJ45
Attention: In E1 twisted-pair standard, 1 and 2 are defined as sending lines, 4 and
5 as receiving lines.
5.3 Sittings of Switch and 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 Clock setting
E1 interface timing (S5.1=ON/OFF, S5.2=OFF): the sending timing is E1 port
timing, and the received data, after buffering, is synchronized with E1 port timing.
1
2
3
4
5
6
7
8
1. TX+ Positive end of data transmission
2. TX- Negative end of data transmission
3. Idel
4. RX+ Positive end of data reception
5. RX- Negative end of data reception
6. Idel
7. Idel
8. Idel

FE1 Fiber Modem Installation and Operation Manual
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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.
Local main timing (S5.1=ON, S5.2=ON): the sending timing is of local crystal
oscillation, and the received data, after buffering, is synchronized with local timing.
5.3.2 Settings of loop back test and pseudo-random code test
S5.5～S5.8 of coded switch S5 are used for setting the loop back test and pseudo-
random code test. S5.5 is local loop back control （LLOOP）and optic interface is
directly looped back to E1 interface. “OFF” indicates normal operation; “ON”
indicates local loop back test. The default is “OFF”. It is used for testing whether
local device is in normal operation.
Local Loop back Schematic
S5.6: local digital loop back control (DLOOP). “OFF” indicates normal operation;
“ON” indicates local digital loop back. The default is “OFF”. With a loop back
from local E1 interface to optic interface, it is used for testing whether the
remote device and optic line are in normal operation.
Local Digital Loop back
S5.7: “OFF” indicates normal operation；“ON” indicates command remote loop
back. The default is “OFF”. As this command must be sent through E1 line to
remote end for validness, it will become invalid at the following two cases: ①
the remote end is not FE1 Fiber Modem remote device; ② FE1 Fiber Modem
is working at a non-framing status, at this moment all time slots of E1 are used
for data transmission at a rate of 2048Kbps. Through a sending of loop back
command from local device to remote device, the command remote loop back
is achieved.
E1 FE1 Fiber Modem Optical
Interface
FE1 Fiber Modem Optical
Interface
E1

FE1 Fiber Modem Installation and Operation Manual
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Remote Loop back
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 E1 output
terminal and tests whether E1 input signal is in compliance with this
sequence standard, so as to judge whether the device and line transmission
have an error code.
Pseudo-random Code Test
Remark: Pseudo-random sequence code test can be made only under a loop back
status. At this moment, constantly lightening of LOOP and PTOK/CRC
lamps shows local status, and flash shows remote status.
5.3.3 Framing/non-framing and time slot settings
Totally 32 coded switches S1, S2, S3 and S4 are used for E1 time slot setting.
E1 Time Slot Setting
1st switch (S1.1) is used for controlling E1 framing/non-framing. “ON” refers to
non-framing mode (2.048Mbps).
31 switches, from 2nd—32nd(S1.2~S1.8, S2, S3, S4), are respectively used for
controlling the selection of 1st –31st time slots. Set at “ON”, the corresponding
time slot is selected; set at “OFF”, the corresponding time slot is not selected.
The rate of E1 interface is completely dependent on the number of the selected
time slots. For example: the setting of 3rd switch to “ON” and all other switches
to “OFF” indicates that 2nd time slot is selected, at this moment the rate is 64K;
the setting of 7th and 8th switches to “ON” and all other switches to “OFF”
indicates that 6th and 7th time slots are selected, with a rate of 2×64K=128K.
FE1 Fiber Modem
E1E1
FE1 Fiber Modem Fiber Link
Remote
Local
E1
E1 FE1 Fiber Modem FE1 Fiber Modem
Local Remote
Fiber Link
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
E1 TS 0 7 15 23 31
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
E1 TS 0 7 15 23 31

FE1 Fiber Modem Installation and Operation Manual
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TSO 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 16th time slot
must not be used for transmission service; ‘1’—PCM31, 16th time slot can be
used for transmission service. Besides, TS1—TS31 are respectively used for
controlling the selection of 1st—31st time slots: ‘1’—the corresponding time slot
is selected; ‘0’—the corresponding time slot is not selected.
Typical application： Non-framing mode: 1st 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: Ex-work S1,S2,S3 and S4 are all set to “OFF”
Attention: The setting of tracking remote time solt:S5.2 to “ON”; S5.1 and S5.3
to “OFF”
6. Common Problems
Common Failures and 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
Optic
interface
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
Optic LOS
data loss
alarm lamp
lightening
1. Optic fiber in wrong
interconnection
2.Optic fiber not well inserted
3.Optic fiber broken
1. Correct the connection 2. Insert
the SC connector in place 3.
Check optic cable 4. Returned to
the manufacturer for repair.

FE1 Fiber Modem Installation and Operation Manual
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4.Internal circuit damaged
4
Lightening of
LOF out-of-
frame alarm
lamp at E1
interface
1.Error code in the line of E1
interface
2.Internal circuit damaged
1.Check if UTP wire couple is
twisted or the connecting cable is
not good contact
2.Returned to the manufacturer
for repair.
5
Lightening of
LOS data
loss alarm
lamp at E1
interface
1.Line of E1 interface not getting
through
2.Internal circuit damaged
1. Check the linear sequence of
UTP cable or check if crystal head
is in good connection; Check if
coaxial cable is broken
2.Returned to the manufacturer
for repair.