Raisecom RC801-60B-FV35 Series User manual

RC801-60B-FV35, RC803-60B-FV35,
RC805-60B-FV35 Series
Standalone V.35＋E1 Dual Interface
Fiber Optic Modem
User Manual
REV.N
Raisecom Technology Co., Ltd.
(05/2006)

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1. Cautions
Please read the following notices carefully before installing
and using the device. Raisecom does not respond to any loss
that caused by violating safety notice.
RC801/803/805-60B-FV35 series device provides V.35
synchronization data interface which complied with ITU
standard. Please firstly connect the V.35 cable before the
device power on. It is seriously forbidden to insert or pull out
V.35 cable when the converter and the other end device are
both power on, otherwise the V.35 interface will be damaged.
This device also provides high sensitive optical interface.
Before connect this device to Fiber media converter please
test the transmitting optical power of the latter. If the optical
power is beyond the overload point of this device please don’t
connect them, otherwise the optical module will be damaged.
This RC801/803/805-60B-FV35 series fiber-optic modem also
provides E1 interface which complied with ITU-T G.703
standard. When connect it to other device please ensure that
the grounding mode of the two devices which linked by the

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coaxial-cable is consistent, and so that the shield layer of the
coaxial-cable can has the same grounding.
There must be grounding protection for the sake of safety and
stability. Do not disassemble the device yourself, we regard it
as you waiver your rights of repair guarantee.

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Contents
1. Cautions.................................................................................................................... 1
2. Overview................................................................................................................... 5
2.1. Introduction ......................................................................................................... 5
2.2. Main features ...................................................................................................... 5
2.3. Model Description ............................................................................................... 6
3. Parameters ............................................................................................................... 8
3.1. Fiber Optic Interface Specification ...................................................................... 8
3.2. V.35 Interface Specification................................................................................. 8
3.3. E1 Interface Specification ................................................................................... 8
3.4. Cable Type.......................................................................................................... 9
3.5. Power Supply & Power Consumption ................................................................. 9
3.6. Dimensions ......................................................................................................... 9
3.7. Ambience............................................................................................................ 9
4. How to use.............................................................................................................. 10
4.1. Description of the Front Panel .......................................................................... 10
4.1.1. Power Supply/Error Code Test Indicator.................................................... 10
4.1.2. Fiber Interface and Fiber Interface Alarm Indicator.................................... 10
4.1.3. V.35 Interface Data Channel Indicator ........................................................11
4.1.4. E1 Interface and It’s Indicator .................................................................... 12
4.2. Description of the Back Panel........................................................................... 12
4.2.1. Power Supply Switch ................................................................................. 13
4.2.2. Power Connector ....................................................................................... 13
4.2.3. V.35 Connector .......................................................................................... 13
4.3. Dip-switch on the bottom .................................................................................. 14
4.3.1. Setup of Timeslot Dip-switch (SW1 to SW4).............................................. 15
4.3.2. Function Dip-switch (SW5) ........................................................................ 15
4.3.3. Function Dip-switch (SW6) ........................................................................ 19
4.3.4. Impedance Choosing Dip-switch SW7....................................................... 20
4.4. Relationship of Dip-switch Configuration and Software Configuration .............. 20
4.5. Basic Connection Type ..................................................................................... 21
4.5.1. Point-to-point, ‘Master Clock – Slave Clock’ Topology ............................... 21
4.5.2. Point-to-point ‘Terminal Clock – Slave Clock’ Topology ............................. 21
4.5.3. Extended Connection Type........................................................................ 22
5. Installation & Preparation ........................................................................................ 23
5.1. Before installation ............................................................................................. 23
5.2. Cautions before Applying the Power Supply ..................................................... 23
5.3. Equipment Deployment..................................................................................... 24
5.4. Connection Diagnoses...................................................................................... 24
6. F & Q ...................................................................................................................... 25

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Appendix A: Introduction of Cable Making ...................................................................... 27
1. CBL-V35-M34M/M34F-D Cable making Instruction ............................................. 27
2. CBL-V35-M34M/M34M-X-D Cable making Instruction ......................................... 27

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2. Overview
2.1. Introduction
RC801/803/805-60B-FV35 series device is PDH fiber optic modem which is deployed to
transmit V.35 signals and transparent E1 data line on fiber. It also provides solution for
Router remote connection and is widely used in constructing Wide Area Networks.
RC801/803/805-60B-FV35 series device is standalone dual interface fiber optic modem
which can be placed on desktop and has individual power supply. It is used in pairs and
provides conversion between V.35 and E1 interfaces to fiber interface. It can also connect
to RC802/804/806-60B series fiber optic modem module which is inserted in RC002-16 or
RC002-4 chassis to realize SNMP network management and consequently manages
remote devices.
2.2. Main features
 The first tributary of client side provides one ITU standard V.35 synchronized data
DCE interface.
 The second tributary of client side provides one ITU-T G.703 E1 interface which has
both 75ΩBNC connector and 120ΩRJ45 connector.
 The line side provides a dual strand fiber interface or a single strand dual
wavelength interface.
 It provides the complete fiber line alarm and internal E1 detection alarm as well as
the local and remote line alarm indication.
 It provides the local and remote loopback detection function of the two tributaries of
client side to check the circuit and device and perform the maintenance.
 The features of the first tributary V.35 interface of client side:
Realize V.35 interface bandwidth adjustment via ITU-T G.704 frame structure.
It supports fractional /unframed (transparent) mode. The fractional mode can
configure time slot freely. The first tributary of client side provides three kinds of
clock modes: master (internal), slave (follow the fiber line clock) and V.35 terminal
clock (follow V.35 interface clock).
When the fist tributary of client side is used in pairs the remote time slot can
automatically follow local time slot configuration.
The internal error code test unit can diagnose and test circuit with the cooperation of
many kinds of loopback styles.
In the fractional mode the PCM30/PCM31 modes are optional and CRC4 verification
function is auto-negotiation.
It provides phase adjustment function for V.35 receiving data.

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IT provides fault pass function to transfer alarm of line side to V.35 interface so that
to judge E1 line error through router.
 Features of the second tributary E1 interface of client side:
It complies with PDH transmission conception to realize the transparent
transmission of E1 data and clock setting in fiber line.
It has all the features of PDH fiber optic modem.
 Very large ASIC chip, low consumption, four level PCB design, high reliability.
2.3. Model Description
RC800-60B-FV35 series fiber optic modem includes the following types:
Model Type Description
RC801-60B-FV35-S1(AC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Dual strand(DSC),0-25km, AC
RC801-60B-FV35-S1(DC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Dual strand(DSC),0-25km, DC
RC801-60B-FV35-S2(AC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Dual strand(DSC),10-60km, AC
RC801-60B-FV35-S2(DC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Dual strand(DSC),10-60km, DC
RC801-60B-FV35-S3(AC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Dual strand(DSC),15-120km, AC
RC801-60B-FV35-S3(DC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Dual strand(DSC),15-120km, DC
RC803-60B-FV35-S1(AC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1310(SC-PC),0-25km, AC
RC803-60B-FV35-S1(DC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1310(SC-PC),0-25km, DC
RC803-60B-FV35-S2(AC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1310(SC-APC),10-50km, AC
RC803-60B-FV35-S2(DC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1310(SC-APC),10-50km, DC
RC805-60B-FV35-S1(AC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1550(SC-PC),0-25km, AC
RC805-60B-FV35-S1(DC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1550(SC-PC),0-25km, DC
RC805-60B-FV35-S2(AC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1550(SC-APC),10-50km, AC
RC805-60B-FV35-S2(DC) Standalone at the Customer Premises, one V.35 interface(M 34),one E1 interface( two BNC and one RJ45), one
Optical interface, SM Single strand 1550(SC-APC),10-50km, DC
RC802-60B-S1 Module type, two E1 interfaces (four BNC or two RJ45), one optical port, SM dual strand (DSC),

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0-25km
RC802-60B-S2 Module type, two E1 interfaces (four BNC or two RJ45), one optical port, SM dual strand (DSC),
10-60km
RC802-60B-S3 Module type, two E1 interfaces (four BNC or two RJ45), one optical port, SM dual strand (DSC),
15-120km
RC804-60B-S1 Module type, two E1 interfaces (four BNC or two RJ45), one optical port, SM single strand
1310(SC-PC), 0-25km
RC804-60B-S2 Module type, two E1 interfaces (four BNC or two RJ45), one optical port, SM single strand
1310(SC-APC), 10-50km
RC806-60B-S1 Module type, two E1 interfaces (four BNC or two RJ45), one optical port, SM single strand
1550(SC-PC), 0-25km
RC806-60B-S2 Module type, two E1 interfaces (four BNC or two RJ45), one optical port, SM single strand
1550(SC-APC), 10-50km
The content with shadow background in above table are the device types described in this
manual. And others are modular type devices.
The following products can work in pairs:
Central office module Customer premises module
RC802-60B-S1
RC801-60B-FV35-S1 RC801-60B-FV35-S1
RC802-60B-S2
RC801-60B-FV35-S2 RC801-60B-FV35-S2
RC802-60B-S3
RC801-60B-FV35-S3 RC801-60B-FV35-S3
RC804-60B-S1
RC803-60B-FV35-S1 RC805-60B-FV35-S1
RC804-60B-S2
RC803-60B-FV35-S2 RC805-60B-FV35-S2

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3. Parameters
3.1. Fiber Optic Interface Specification
Bit rate: 100Mbps
Line code: 4B5B
Fiber connecter: SC (RC801-60B-FV35-S1 dual strand fiber port also has FC
type)
Model Type Transmission
Wavelength
(Nm )
Laser
Type Receiver Type Launch Power
(dBmW)
Over
Load
Point
(dBm)
Receiving
Sensitivity
(dBmW )
Typical
Transmission
Distance
(Km)
RC801-60B-FV35-S1 1310 FP PIN -15,-8 >-8 <-34 0-25
RC801-60B-FV35-S2 1310 FP PIN -5,0 >-8 <-34 10-60
RC801-60B-FV35-S3 1550 DFB PIN -5,0 >-10 <-36 15-120
RC803-60B-FV35-S1 1310 FP PIN -12,-3 >-8 <-30 0-25
RC805-60B-FV35-S1 1550 DFB PIN -12,-3 >-8 <-30 0-25
RC803-60B-FV35-S2 1310 FP PIN -5,0 >-8 <-32 10-50
RC805-60B-FV35-S2 1550 DFB PIN -5,0 >-8 <-32 10-50
3.2. V.35 Interface Specification
Physical Characteristics: Complies with V.35 interface standard of ITU suggestions
Connector Type: ISO2593 female connector (M 34 interface)
Working Mode: DCE (support cross connection with other DCE device)
Interface Bit Rate: V.35 interface bit rate is N×64Kbps（N=1-31）at E1 fractional
mode;
V.35 interface bit rate is 2048Kbps at E1 transparent mode
3.3. E1 Interface Specification
Electric Characteristic: Complies with ITU-T G.703 Suggestion
Other Characteristic: Fault pass, jitter capability complies with ITU-T G.823, G.724
and related suggestion
Interface type: 75Ωunbalanced BNC connector (default)
120Ωbalanced RJ45 connector (configured by dip-switch on
the bottom of the device)
Bit rate: 2048Kbps±50ppm

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3.4. Cable Type
 V.35 interface cable type
When connect this series product with DTE equipments such as routers through M34
interface, please use the special DTE router cable. When the cable is not long enough
please order the extended cable CBL-V35-M34M/M34F-D from Raisecom (in Appendix).
When connecting this series product with other DCE equipments, the cross cable
CBL-V35-M34M/M34M-X-D is necessary, and please order it from Raisecom (in
Appendix).
 E1 interface cable type
When connecting to BNC connector please use SYV 75 coaxial cable.
When connecting to RJ-45 connector please use 0.6mm(22AWG) Twisted Pair.
3.5. Power Supply & Power Consumption
Power Supply: DC –48V, tolerance range is from –36V to –72V
DC +24V, tolerance range is from +18 V to +36V
AC 220V, tolerance range is from 165V to 265V
Power Consumption: ≤5W
3.6. Dimensions
Standalone equipment can be placed on the table.
Dimension: 142 (width) x 38 (height) x 187 (depth) mm
3.7. Ambience
Working Temperature: 0 - 45℃
Humidity: ≤90%（25℃）

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4. How to Use
4.1. Description of the Front Panel
PWR/PAT
LOF
RC800-60B-FV35 SERIES
LOS TD
RD ERR TX RX
AIS
CRC
LOF
LOOP
CH1V35
TX RX
BALANCE
LOS
LOOP
CH2 E1
View of the front panel
4.1.1. Power Supply/Error Code Test Indicator
PWR/PAT Green/Yellow:
Steady Green, built-in power works in good condition.
Yellow, when using built-in error code test function, if the fiber interface receives its own
sending pseudo random sequence data the indicator will be in steady yellow. When it gets
an error code the indicator will turns to green for at least 1 second.
Steady off, the device is power off.
4.1.2. Fiber Interface and Fiber Interface Alarm Indicator
For RC801-60B-FV35 dual strand device, TX stands for optical signal output (transmit)
and RX stands for input (Receive).
For RC803/5-60B-FV35 single strand device, TX and RX has no actual meanings. In one
fiber the transmission and receiving can be distinguished by different wave length.
LOS Red:
Steady light: Local optical receiving signal is lost;
Periodically flash: Remote optical receiving signal is lost;
Steady off: Local/remote optical receiving signal is normal.
LOF Red:
Steady light: Local optical receiving signal is out of frame;
Periodically flash: Remote optical receiving signal is out of frame;
Steady off: Local/remote optical receiving signal is not out of frame.
ERR Yellow:
Steady light: There is 1E-6 error code alarm in local optical receiving signal;
Periodically flash: There is 1E-6 error code alarm in remote optical receiving signal;

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Non-periodically flash: There is 1E-3 error code alarm in remote or local optical
receiving signal;
Steady off: There is no error code alarm in local/remote optical receiving signal.
4.1.3. V.35 Interface Data Channel Indicator
AIS Red:
Steady Light: There is AIS alarm in E1 data channel of local optical receiving signal;
Flash: There is AIS alarm in E1 data channel of remote optical receiving signal;
Steady Off: There is no AIS alarm in E1 data channel of local/remote optical receiving
signal;
CRC Red:
Steady Light: There is CRC4 checkout alarm in E1 data channel of local optical
receiving signal;
Flash: There is CRC4 checkout alarm in E1 data channel of remote optical receiving
signal;
Steady Off: There is no CRC4 checkout alarm in E1 data channel of local/remote
optical receiving signal;
LOF Red:
Steady Light: There is G.704 out of frame alarm in E1 data channel of local optical
receiving signal;
Flash: There is G.704 out of frame alarm in E1 data channel of remote optical
receiving signal;
Steady Off: There is no G.704 out of frame alarm in E1 data channel of local/remote
optical receiving signal;
LOOP Yellow:
Steady Light: Local bidirectional loopback indication;
Flash: Remote bidirectional loopback indication;
Steady Off: There is no loopback in local/remote side.
TD Green:
Flash: There is data transmission in V.35 interface, and the flash frequency stands for
the different bit rate of V.35 interface. When the bit rate is 64Kbps the flash frequency is
lowest and the 2048Kbps the highest.
Steady Off: There is no transmission in V.35 interface.
RD Green:
Flash: There is data receiving in V.35 interface, and the flash frequency stands for the
different bit rate of V.35 interface. When the bit rate is 64Kbps the flash frequency is
lowest and the 2048Kbps the highest.

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Steady Off: There is no receiving data in V.35 interface.
Notice: This device provides CRC4 checkout’s auto-negotiation function. If there is CRC4
checkout signal in E1 data of optical interface the CRC4 checkout function will be enabled
automatically, and the CRC alarm indicator will be available when there is CRC4 error. On
the contrary, if there is no CRC4 checkout signal in E1 data of optical interface the CRC4
checkout function will be disable and CRC alarm indicator unavailable.
4.1.4. E1 Interface and It’s Indicator
BNC Coaxial Interface: TX, 75Ωunbalanced signal transmission (output);
RX, 75Ωunbalanced signal receiving (input).
RJ-45 Interface: 1st, 2nd pin, 120Ωbalanced signal transmission (output);
4
th, 5th pin, 120Ωbalanced signal receiving (input).
Notice: The 75ΩBNC Coaxial Interface is available in default. If the RJ-45 20Ωbalanced
Interface is needed please configure the SW7 on the bottom of the device.
LOS Red:
Steady light: Local E1 receiving signal is lost;
Periodically flash: Remote E1 receiving signal is lost;
Steady off: Local/remote E1 receiving signal is normal.
LOOP Yellow:
Steady Light: Local bidirectional loopback indication;
Flash: Remote bidirectional loopback indication;
Steady Off: There is no loopback in local/remote side.
4.2. Description of the Back Panel
V35
Back Panel of the AC Device

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-48V PGND BGND
V35
Back Panel of the DC Device
4.2.1. Power Supply Switch
Istands for ON, Ostands for OFF
4.2.2. Power Connector
AC Power connector: It is the standard three-phase power connector. Please make sure
that the grounding is correct. If your AC power supply has no grounding signal please
connect the grounding end on the right of the device to the protection grounding of the
center office.
DC Power connector: It has three connection end: -48V, PGND and BGND. Please make
sure that the PGND end is connected to protection grounding. The grounding end on the
right of the device and the PGND are internally connected, so it is enough to connect any
of it to protection grounding.
4.2.3. V.35 Connector
Left figure is a standard ISO2593 connector of V.35
interface. This device has a DCE Connector Face-34 Pin
Female connector which can be connected to standard
DTE cable.
The description of this connector is as following table:
I-Input O-Output
Signal Name I/O Pin Name
Chassis Ground — CGND - A
Signal Ground — GND - B
Receive Data (A) — RD(A) O R
Receive Data (B) — RD(B) O T
Receive Timing (A) — RCK(A) O V

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Receive Timing (B) — RCK(B) O X
Send Data (A) — TD(A) I P
Send Data (B) — TD(B) I S
Send Timing (A) — TCK(A) O Y
Send Timing (B) — TCK(B) O AA
Terminal Timing (A) — SCTE(A) I U
Terminal Timing (B) — SCTE(B) I W
Request to Send — RTS I C
Clear to Send — CTS O D
Data Set Ready — DSR O E
Data Carrier Detect — DCD O F
Data Terminal Ready — DTR I H
4.3. Dip-switch on the bottom
There are seven group eight-bit dip-switches that are SW1,
SW2, SW3, SW4, SW5, SW6 and SW7 on the bottom of the
device. The configuring of these dip-switches must be
performed before power on! If the switches are configured
during running status, the device must be restarted to make the configuration
effective. Each dip-switch is shown as the left figure. The DOWN indicates OFF and UP
indicates ON when from left to right the bit is 1st to 8th. There is also a note pasted on the
bottom of the device as the following figure:
Configuration Note on the device bottom
S
W1 SW2 SW3 SW4 SW5 SW6
O
ptic
Port
V
.35 Port
Power
Interface
Power
Switch
E
1
P
ort
SW7
1 2 3 4 5 6 7 8
ON DIP
OFF
ON

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4.3.1. Setup of Timeslot Dip-switch (SW1 to SW4)
Timeslot switches are SW1, SW2, SW3 and SW4.
“√” indicates enable; “×” indicates disable
SW1 definition (default is all OFF)
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit
SET Frame Status TS1 TS2 TS3 TS4 TS5 TS6 TS7
ON Fractional √√√√√√√
OFF Unframed × × × × × × ×
SW2 definition (default is all OFF)
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit
SET TS8 TS9 TS10 TS11 TS12 TS13 TS14 TS15
ON √√√√√√√√
OFF × × × × × × × ×
SW3 definition (default is all OFF)
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit
SET TS16 TS17 TS18 TS19 TS20 TS21 TS22 TS23
ON √√√√√√√√
OFF × × × × × × × ×
SW4 definition (default is all OFF)
1st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit
SET TS24 TS25 TS26 TS27 TS28 TS29 TS30 TS31
ON √√√√√√√√
OFF × × × × × × × ×
Notice:
When the SW1-1 is OFF (unframed mode) the TS1 to TS31 is invalid.
When the SW1-1 is ON( Fractional mode) the TS1 to TS31 bits are valid and can not
be all OFF. That is to say there must be some timeslot which is enabled.
4.3.2. Function Dip-switch (SW5)
In below table “√” indicates enable; “×” indicates disable
Definition of SW5 (The 1st and 2nd bits are ON in default and others are OFF)
1
st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit
Set Timing1 Timing2 TS_FLOW BET RX CLK LP1_EN LP2_EN LP_SEL

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Clock
1st
Clock
2nd
Timeslot
Follow
Error
Code
Test
Phase 1st Tributary
Bidirectional
loopback
2nd Tributary
Bidirectional
loopback
Loop back
position
ON * * √√Reverse √√Local
OFF * * × × Positive × × Remote
1. The 1st and 2nd bit: Clock mode choosing dip-switch Timing1, Timing2 (default is
ON)
The Clock mode is defined by the 1st bit and 2nd bit of SW5, detail is shown in below table:
SW5-1 SW5-2 Clock Mode
OFF OFF Master Clock (Internal clock)
OFF ON
ON OFF
V.35 terminal Clock ( Follow V.35 interface
clock)
ON ON Slave Clock ( Follow fiber line clock)
2. The 3rd bit: Timeslot auto follow function TS_FLOW (default OFF)
SW5-3 Timeslot auto follow function
ON Enable
OFF Disable
To make local timeslot follow remote timeslot, below three conditions should be ensured:
(1) This series device is used point to point in pair.
(2) There is no PCM device which occupy the Sa bit linked in E1 line.
(3) Local device works on slave clock mode.
When all of above condition is satisfied, setting the SW5-3 of local device as ON to open
timeslot auto-follow function, the timeslot and frame mode (PCM30/PCM31) of local
device will follow the configurations of remote device automatically.
3. The 4th bit: Error code test function choosing dip-switch BET (default OFF)
SW5-4 Internal Error Code Test Function
ON Enable
OFF Disable
There is an error code test unit inside this series device, and the main purpose of this unit
is producing pseudo random sequence (2E15-1 STD) and sending them to optical line.
This sequence can be uploaded to proper data channel by configuration, and then via
many loopback modes the returned sequence is sent to device for testing. The testing
result will be displayed by the PWR/PAT indicator on front panel. When error code is
captured the PWR/PAT indicator will turn to green and keep for at least one second. If
there is no new error code occurs the PWR/PAT indicator will come back to steady yellow
status.

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The device will add test sequence to user data channel after the error code test function is
enabled. This function is available in fractional mode and unframed (transparent) mode,
and when this function is enabled the V.35 operation will intermit.
Notice: The error code test function can be operated with many loop back tests. When the
local bidirectional loop back function is disabled the loop back can be simulated by fiber,
but the dual-fiber S3 and all single fiber device can not. At the time if PWR/PAT indicator is
steady yellow, it indicates that correct test code was received. If the remote bidirectional
loop back is enabled accompanied with error code test, it means the whole information
process will be tested.
4. The 5th bit: V.35 RX CLK Phase Choosing Dip-switch (default OFF)
SW5-5 Phase Choosing
ON RX CLK Reverse Phase
OFF RX CLK Positive Phase
The RX CLK phase choosing is provided because of the different V.35 clock and data
phase of different brand router. On Cisco series router the test result of V.35
synchronization WAN interface is passing when this device is connected and its RX CLK
is Positive.
RX CLK is Positive: Data will be sent to RD signal during RX CLK falling edge.
RX CLK
RD
RX CLK is Reverse: Data will be sent to RD signal during RX CLK rising edge.
RX CLK
RD
Notice: The relationship of TX CLK and TD phase of this series device is auto-adjusted, so
users need not to configure it.
5. The 6th, 7th and 8th bit: Loop back dip-switch (default OFF)
SW5-6 SW5-7 SW5-8
ON
1st Tributary
Bidirectional
loopback enable
2nd Tributary
Bidirectional
loopback enable
Local loopback

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OFF
1st Tributary
Bidirectional
loopback disable
2nd Tributary
Bidirectional
loopback disable
Remote Loopback
1st Tributary V.35 interface remote bidirectional loopback sketch map:
Above figure is the result of configuring remote bidirectional loopback of 1st tributary V.35
interface on “local fiber optic modem”. At the same time the remote fiber optic modem’s
loopback dip-switch should be all OFF in default.
1st Tributary V.35 interface local bidirectional loopback sketch map:
Above figure is the result of the configuring local bidirectional loopback of 1st tributary V.35
interface on “local fiber optic modem”. At the same time the remote fiber optic modem’s
loopback dip-switch should be all OFF in default.
2nd Tributary E1 interface remote bidirectional loopback sketch map:
Above figure is the result of the configuring remote bidirectional loopback of 2nd tributary
E1 interface on “local fiber optic modem”. At the same time the remote fiber optic modem’s
loopback dip-switch should be all OFF in default.
2nd Tributary E1 interface local bidirectional loopback sketch map:
Above figure is the result of the configuring local bidirectional loopback of 2nd tributary E1
interface on “local fiber optic modem”. At the same time the remote fiber optic modem’s
loopback dip-switch should be all OFF in default.
Local Fiber
Optic Modem
Remote Fiber
Optic Modem
V.35 Error Code
Equipment
Fiber
V.35
V.35 Error Code
Equipment
V.35
E1 E1
Local fiber
optic modem
Remote fiber
optic modem
V.35 Error code
e
q
ui
p
men
t
Fiber
V.35
V.35 Error code
equipment
E1
V.35
E1
Local Fiber
optic modem
Remote Fiber
optic modem
E1 Error code
e
q
ui
p
men
t
Fiber
V.35
E1
V.35
E1
E1 Error code
e
q
ui
p
men
t
Local fiber
optic modem
Remote fiber
optic modem
E1 Error code
e
q
ui
p
men
t
Fiber
V.35
E1 Error code
e
q
ui
p
men
t
E1
V.35
E1

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V.35 and E1 interface both remote bidirectional loopback sketch map:
Above figure is the result of the configuring remote bidirectional loopbacks of both V.35
interface and E1 interface on “local fiber optic modem”. At the same time the remote fiber
optic modem’s loopback dip-switch should be all OFF in default.
V.35 and E1 interface both local bidirectional loopback sketch map:
Above figure is the result of the configuring local bidirectional loopbacks of both V.35
interface and E1 interface on “local fiber optic modem”. At the same time the remote fiber
optic modem’s loopback dip-switch should be all OFF in default.
4.3.3. Function Dip-switch (SW6)
1
st bit 2nd bit 3rd bit 4th bit 5th bit 6th bit 7th bit 8th bit
Set Fault
Pass
Reserved Reserved Reserved Configuration of vendor
ON Enable
OFF Disable Normal Normal Normal
Forbidden to be changed by users
1. The 1st bit: Fault Pass dip-switch (Default is OFF)
SW6-1 Fault Pass Function
ON Enable
OFF Disable
When the fault pass function is enabled, the alarms on fiber receiving side and
transmitting side will be transferred to DCD and CTS signals on 1st tributary V.35 interface;
when the fault pass function is disabled, the DSR, DCD and CTS signals on V.35 interface
will be always valid.
When the fault pass function is enabled, and if there is local alarm on fiber optic modem,
that is to say there are errors on fiber receiving side, the DCD signal of V.35 interface will
Local fiber
optic modem
Remote fiber
optic modem
E1 Error code
equipment
Fiber
V.35
E1
V.35
E1
V.35 Error code
equipment
V.35 Error code
equipment
E1 Error code
equipment
Local fiber
optic modem
Remote fiber
optic modem
E1 Error code
equipment
Fiber
V.35
E1
V.35
E1
V.35 Error code
equipment
V.35 Error code
equipment
E1 Error code
equipment