RC801/803/805-120B
4E1 Fiber-Optic Multiplexer
User Manual
Raisecom Technology Co., Ltd.
(04/2005)
Raisecom Technology Co., Ltd
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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.
RC800-120B series optical multiplexer provides two types of
power supply: AC and DC. When using DC power supply,
please plug the power supply connectors according to this
mannual strictly and avoid contrary connecting.
RC800-120B series fiber-optic multiplexer is integrated device
that has precise elements, please avoid violent shakes and
impacts, and do not disassemble or maintain the device
yourself. If it is required, please do it under the guide of our
technical staff following in the steps of anti static. Please
contact us if there is any need.
There must be grounding protection for the sake of safety; 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 ..........................................................................................................................................3
2.1. Introduction ..............................................................................................................................3
2.2. Product Features......................................................................................................................3
2.3. Part Number Introduction .........................................................................................................3
2.4. Dimensions ..............................................................................................................................4
3. Parameters.......................................................................................................................................5
3.1. E1 Interface Parameters ..........................................................................................................5
3.2. Optical interface characteristic .................................................................................................5
3.3. Power Supply...........................................................................................................................5
3.4. Ambience .................................................................................................................................5
4. How to use .......................................................................................................................................6
4.1. Introduction of the Front Panel ...............................................................................................6
4.1.1. Power indicator ................................................................................................................6
4.1.2. Alarm indicators ...............................................................................................................6
4.1.3. DIP-switch SW1 Setup: All OFF by Default .....................................................................6
4.1.4. DIP-switch SW2 Setup: All OFF by Default .....................................................................8
4.1.5. Function Buttons: All “High Position” by Default ..............................................................8
4.1.6. Network Management Port ..............................................................................................8
4.2. Introduction of the Rear Panel .................................................................................................8
4.2.1. Power Switch ...................................................................................................................8
4.2.2. Power Socket...................................................................................................................9
4.2.3. Optical Port ......................................................................................................................9
4.2.4. E1 Interface .....................................................................................................................9
4.3. DIP-switch on the Bottom Panel ..............................................................................................9
5. Installation and Test .......................................................................................................................10
5.1. Inspect after Opening.............................................................................................................10
5.2. Preparation before Installation ...............................................................................................10
5.3. Installation Procedure ............................................................................................................10
5.3.1. Connecting Cables.........................................................................................................10
5.3.2. Applying the Power Supply ............................................................................................10
5.3.3. Configuring Buttons and Switches .................................................................................11
6. Troubleshooting .............................................................................................................................12
7. Appendix A Introduction of Cable Making ......................................................................................14
A.1 E1 Cable ......................................................................................................................................14
A.2 Computer Serial Cable Making ....................................................................................................14
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2. Overview
2.1. Introduction
RC801/803/805-120B series fiber-optic multiplexers are ideal fiber-optic transmission
devices for point-to-point networks, medium-sized and small capacity networks, such as
wireless communication base stations, private communication networks, and switches
organizing networks. The transmission capacity of RC800-120B is 4 E1 channels
(equivalent to 120 voice channels).
2.2. Product Features
• Very large scale ASIC chips ensure low power consumption; 4-layer PCB ensures high
reliability
• Complete alarm indication that can display local and remote alarms simultaneously
• Alarm lock and E1 channel loop back detection capabilities provide convenient debug
methods.
• Capable of local and remote network management, providing 4-bit cascading address
DIP switches
2.3. Part Number Introduction
Example:
RC
801 – 120 B / AC
AC power supply
Version
4 E1 channels, equivalent to 120 voice channels
Standalone dual-strand fiber-optic multiplexer
Company code (short for Raisecom)
First section head:
RC —— short form of Raisecom
First section end:
801 —— standalone dual-strand fiber-optic multiplexer
803 —— standalone 1310 TX wavelength single strand fiber-optic multiplexer
805 —— standalone 1550 TX wavelength single strand fiber-optic multiplexer
Second section head:
120 —— 4 E1 channels, equivalent to 120 voice channels
Second section end:
B —— version B
Suffix:
AC ——AC 220V power supply
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DC —— DC -48V power supply
Note: RC801 standalone fiber-optic multiplexer shall work in pairs
RC803 and RC805 must cooperate in pairs. One RC803 must work with one RC805.
2.4. Dimensions
Compact 19-inch standard 1U-high chassis, 440mm (W) x 43.6mm (H) x 180mm (D)
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3. Parameters
3.1. E1 Interface Parameters
Bit rate: 2048Kbps±50ppm
Line code: HDB3
Impedance of interface: 75Ω (unbalanced) or 120Ω (balanced)
Electrical characteristics: complies with ITU-T G.703
Transfer characteristics: complies with ITU-T G.823
Input jitter tolerance: complies with ITU-T G.823
3.2. Optical interface characteristic
Bit rate: 100Mbps
Line code: 4B5B
Fiber connector: SC
Part Number Connector
Type
Wavelength
(nm)
Launch
Power
(dBmW)
Receiving
Sensitivity
(dBmW)
Over
load
point
(dBmW)
Transmission
Distance
(Km)
Link Loss
(dB/Km)
RC801-120B-S1 DSC 1310 -15 ~ -8 < -34 -8 0 ~ 25 0.5
RC801-120B-S2 DSC 1310 -5 ~ 0 < -34 -8 10 ~ 60 0.5
RC801-120B-S3 DSC 1550/DFB -5 ~ 0 < -36 -10 15 ~ 120 0.25
RC803-120B-S1 SC/PC 1310
-12～-3
< -30 -8 0 ~ 25 0.5
RC803-120B-S2 SC/PC 1310 -5 ~ 0 < -32 -8 10 ~ 50 0.5
RC805-120B-S1 SC/PC 1550
-12～-3
< -30 -8 0 ~ 25 0.5
RC805-120B-S2 SC/PC 1550 -5 ~ 0 < -32 -8 10 ~ 50 0.5
3.3. Power Supply
DC: -48V, range from -36V to -72V
AC: 220V, range from 165V to 265V
Power consumption: ≤10W
3.4. Ambience
Working temperature: 0 ~ 45℃
Relative humidity: ≤90% (25℃)
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4. How to use
4.1. Introduction of the Front Panel
Figure1: Sketch of the front panel of RC800-120B
4.1.1. Power indicator
PWR (green): On, power supply is functioning normally.
4.1.2. Alarm indicators
Alarm indicators of both local and remote side can be displayed. The L row indicates “local”.
The R row indicates “Remote”.
• General alarm:
GL general alarm indicator (red): Any generated alarm will make GL indicator “on”.
• LOS for E1 link
LOS1~4 E1 link (red): when there is signal loss of any E1 channel, the relative alarm
indicator turns red.
z Alarm of optical port:
LOS loss of signal (red): When receiving signals are lost, the alarm indicator turns on.
LOF loss of frame (red): When optical receiving frames lose synchronization, the alarm
indicator turns on.
E-3 bit error alarm (red): ON, when the receiving bit error rate exceeds 10
-3
.
E-6 bit error alarm (yellow): ON, when the receiving bit error rate exceeds 10
-6
.
4.1.3. DIP-switch SW1 Setup: All OFF by Default
DIP-Switch SW1 on the front panel is used for setting loop-back detection and saving
the configurations
• 1st ~ 4th: Loop-back
1st bit 2nd bit 3rd bit 4th bit Loop-back
1 2 3 4 5 6
OFF
ON
LOS on E1
Function ButtonDip-switch
NM Interface
GL
Power
Alarm of Fiber
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OFF OFF OFF OFF No
loop-back
OFF OFF OFF ON 1st E1
OFF OFF ON OFF 2nd E1
OFF OFF ON ON 3rd E1
OFF ON OFF OFF 4th E1
ON ON ON ON All E1 links
Note: Only two test method can be set: single E1 channel loop-back or all E1 channels
loop-back. When single E1 channel loop-back is testing, the other channels work normally.
• 5th bit: loop-back type options
This switch is used to choose “remote loop-back” or “local loop-back” when performing
the E1 loop-back operations.
5th bit Loop-back type option
OFF Remote loop-back enable
ON Local loop-back enable
Figure2: sketch map of setting remote loop-back on local site
Figure3: sketch map of setting local loop-back on local site
Note: When any loop-back is set on local site, 1st ~ 4th loop- back DIP-switch of remote site
must be all off (not loop-back).
• 6th bit: Saving the configurations
OFF: when rebooted, the equipment will read from the saved configurations.
ON: when rebooted, the equipment will not read from the saved configurations.
6th bit Switch for saving configurations
OFF Read from the saved configurations when
booting
ON Not read from the saved configurations when
booting
Local
Remote
Fiber
E1
E1
Multipl
exer
BER tester
Multipl
exer
Local
Remote
Fiber
E1
E1
Multipl
exer
BER tester
Multipl
exer
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4.1.4. DIP-switch SW2 Setup: All OFF by Default
SW2 is the switch for address code setting. When all OFF, the equipment can be remote
managed; otherwise, it can be managed locally through LNK-UP port.
The addresses shall not be the same for the equipment cascaded at
one serial port. There are 4 bits of this switch, so that the max number
of local cascade equipment is 15.
4.1.5. Function Buttons: All “High Position” by Default
• GL LCK / GL CLR Global alarm lock/ Global alarm clear button:
When button is “low”, the GL is on Global alarm lock mode. The GL indicator will not off
once turned on until alarms are cleared.
When button is “high”, the GL is on Global alarm clear mode.
• MASK / NO MASK
“Low”: Mask unused E1’s alarm
“High”: Not mask unused E1’s alarm
• EN RING / DIS RING Alarm ring enable/disable button
“Low”: Enable alarm ring. When there is alarm, the “zi…zi…” alarm rings.
“High”: Disable alarm ring, but the service phone still rings.
• CALL Service phone button
“Low”: the “di…di…” rings at the remote-site equipment
“High”: the ring off at the remote site
4.1.6. Network Management Port
• LNK-UP shall be connected to the serial port of computer or LNK-DWN port of up-level
equipment when cascading
• LNK-DWN shall be connected to low-level equipment LNK-UP port
Please refer to Appendix A.2 for the sequence of serial cable between LNK-UP and
computer serial port.
Please use RJ45-RJ45 straight-through cable to connect LNK-DWN and LNK-UP ports.
4.2. Introduction of the Rear Panel
Figure 4. RC800-120B standalone PDH multiplexer
4.2.1. Power Switch
This switch is used to turn on/off the power supply.
1 2 3 4ON
OFF
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4.2.2. Power Socket
AC: 220V standard triple-phase power socket
DC: -48V power interface. Left pin for -48V, right pin for 0, and the middle pin for ground
4.2.3. Optical Port
• The fiber connector is DSC/PC for dual-strand models, TX for signal output and RX for
signal input
• The fiber connector is SC/PC for single strand models.
4.2.4. E1 Interface
There are 4 groups of E1 interface. Each provides 2 BNC coaxial ports and 1 RJ45 port.
Refer to Appendix A for cable making.
• BNC for 75 Ohm unbalanced signal. OUT for output and IN for input
• RJ45 for 120 Ohm balanced signal.
4.3. DIP-switch on the Bottom Panel
The DIP-switch can be set by small flat screw-driver.
Each group of dip-switch corresponds to one E1 interface.
Definition as shown below
1st 2nd 3rd 4th 1st 2nd 3rd 4th
ON ON ON OFF Or OFF OFF OFF ON
75Ω unbalanced signal effective 120Ω balanced signal effective
As shown in figure above, the default status is set as “75Ω unbalanced signal BNC
interface effective”.
It is suggested that users should use BNC connector for 75 Ohm unbalanced signal and
RJ45 connector for 120 Ohm balanced signal.
1 2 3 4
ON
OFF
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5. Installation and Test
5.1. Inspect after Opening
Please first check if the models and part numbers are in consistence, and also check if the
equipments are damaged.
5.2. Preparation before Installation
z Carefully read this manual
z Prepare all kinds of the cable. Ensure that they are not short-circuited. Refer to
Appendix A for cable making.
z Ensure the pressure of power supply is in the tolerance range, the chassis is well
connected with the ground.
z Prepare the BERT and optical power meter for test of line quality.
z Change the dip-switch setting on the bottom panel if 120 Ohm balanced signal interface
is required.
z Fix the equipment on to 19-inch rack or place the equipment at stable and secure
environment. Pay attention to the requirements of the ambience.
5.3. Installation Procedure
5.3.1. Connecting Cables
z E1 port
It is suggested that users use SYV75-5, SYV75-3, and SYV75-2-2 coaxial cables to
connect the BNC connector. And use twisted-pair to connect the RJ45 connector.
z Optical interface
Plug the SC fiber tail into optical interface (push hard until to the deep end). If not sure
about transmission direction, it’s advised first to turn on the power of device and then plug
in the fiber cable.
5.3.2. Applying the Power Supply
If power supply (PS) is DC –48V, first connect middle end to PGND. Turn off PS, connect
“-48V” end with the lower electric level cable, “0V” end with higher electric level cable. Make
sure no reverse connection, or no short circuited, and then turn on power.
If PS is AC 220V, use the PS line in the accessories.
When PS is turned on, the PWR indicator should be on.
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5.3.3. Configuring Buttons and Switches
After turning on power of the device, first ensure there is no alarm on optical port. If optical
ports are connected properly, there shall be no LOS, LOF, and E-3 alarm. The E-6 (yellow)
may be on the moment when the power is just turned on. This is because turning on the
power causes jitters which results in a few bit errors. After 10 seconds, E-6 will be off. This
indicator refreshes in every 10 seconds.
z Bit error rate test
Using 2M bit error tester as well as loop-back switch of front panel can test the bit error
level of E1 channel. Refer to Chapter 4.
z Mask unused E1 channel alarm
If the connected E1 links are working in good condition without any signal loss, while there
is still another unused E1 link, the LOS alarm for unused E1 link may occur, which is called
“unused E1 alarm”. Press MASK/NO MASK button “on” to clear all the unused E1 alarm
and all the E1 LOS alarm indicators will be off.
In the case unused E1 link alarm being masked, if the connected E1 sub-channel is
disconnected, the LOS indicator of this sub-channel will still be on.
If power supply is cut off and turned on again, then the mask function will be disabled.
Press button to “off” and then pressed to “on” again.
If after a period of operation, a new E1channel is needed, first disable the mask function
and then connect E1 link.
z Turn on the alarm ring
Press the button “ON” of EN RING / DIS RING to make alarm ring available. In this time, if
there is any one alarm indicator on, it will ring like “ZI…ZI…”.
z GL alarm indicator lock (optional)
When there is no alarm indicator on, press GL LCK / GL CLR to “ON”, global alarm lock
function is configured as enable. If there is any alarm, then the global alarm indicator will
keep on. When all other alarm are eliminated, press the button of GL LCK / GL CLR to
“OFF” to clear the GL alarm indicator
When the GL LCK / GL CLR button is “OFF”, also called real time display, i.e. if there is
other alarm, the global alarm is on; if there is no other alarm, the global alarm is off.
In the unstable voltage environment, there are often instantaneous alarms for voltage
waving. In this environment, it is not suitable for operating the GL alarm lock function.
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6. Troubleshooting
If there are any problems during installation and using, try the following proposals. If the
problems still can not be solved, please contact distributors/agents for help.
The following explanations and solutions for alarms at optical ports and LOS alarms at E1
ports are used to handling local alarm problems. For remote-end alarms, please handle
them at remote site.
z Green PWR indicator not on
Answer: PS faults. Check whether PS is working properly and –48 PS connection is not
reversed.
z GL global alarm red indicator on
Answer: there are three different cases.
1． If there are other alarms on, please solve corresponding problem and then clear
GL.
2． If there is no other alarm indicators but only GL alarm on and GL LCK button is
on. This means there was once other alarm on, in this case can clear GL alarm.
3． If all other alarms are “OFF” and the GL LCK button is also “OFF”, but GL alarm
indicator still flash or on and there is a HDB3 coding violation alarm in E1
receiving signals. There is problem that E1 link is too long to bring too much
disturbance, so the signal attenuation is beyond –6dB. We can test the level of bit
rate when this E1 link connecting with RC801-480B.
z LOS red indicator of optical port is on
Answer: Loss of receiving signal occurs at optical port. Check whether the input fiber (RX)
is connected well and ensure not reversed. Or check the receiving optical power with
optical power test-meter; it should be greater than receiving sensitivity specification.
z LOF red indicator of optical port is on
Answer: Loss of frame synchronization of receiving signal at optical port. In this case,
optical signal has been received, but the optical power may be near threshold value of
sensitivity. Check RX optical power and ensure whether the sending optical port (TX) of
remote-site is connected.
z E-3 red indicator is on at optical port
Answer: The bit error of optical RX signal is greater than 10
-3.
Check if optical RX port
connects well and RX optical power.
z E-6 yellow indicator of optical port is on
Answer: The bit error of optical RX signal is greater than 10
-6.
It is normal that E-6 alarm
occurs for 10 seconds just after turning on the power, after 10 seconds the E-6 indicator will
be off. If E-6 alarm occurs during operation, check whether optical RX port connects well
and RX optical power.
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z LOS red indicator of E1 sub-channel is on
Answer: Loss alarm of RX signal at E1 sub-channel, no HDB3 signal is received. Check
whether all E1 ports are connected well, or whether 75 Ω cables are reversely connected,
or whether the wires of 75 Ω cables are in right order. If LOS alarm occurs at unused E1
sub-channel, press “mask” button to “on” to musk the alarm after finishing the configuration
of device.
z Mask button is on, but there is still alarm in unused E1 sub-channel.
Answer: probably the mask function is disabled if power supply is cut off and then turned on.
To solve is by pressing the mask button to “OFF”, and then pressing to “on” to enable mask
function.
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7. Appendix A Introduction of Cable Making
A.1 E1 Cable
75 Ohm BNC connector:
SYV 75-5, SYV 75-3, or SYV 75-2-2 coax cable，the distance shall not be longer than
200m.
First pick out the BNC connector from the accessories, and release the tail protecting jack.
Secondly, separate the core from the shield, and put the tail protecting jack on it. Solder the
strand with the core of the BNC connector. Solder the cable shield with the shield of the
BNC connector. Finally, fix the jack at the end of the connector.
120 Ohm RJ45 connector:
It is suggested that connect with unshielded twisted pair
RJ45 connector (BALANCE), 1 to 8 pin from left to right be defined as following:
1——OUT＋ output＋
2——OUT－ output－
5——IN＋ input＋
6——IN－ input－
Others——GPND
A.2 Computer Serial Cable Making
z Computer serial port LNK-UP adopts RJ45 connector. The definition of pins:
3 ——RXD 232 signal input
7 ——TXD 232 signal output
4, 8 ——GND
Others——hang on
The sequence of the cable for connection between LNK-UP port (RJ45) and computer
serial port (DB9 female connector) is as follows.
RJ45 DB9F
3 ←— 3
7 —→ 2
4, 8 —— 5
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@2005 Raisecom Technology Co., Ltd.
All trademarks are the property of their respective owners.
Technical information may be subject to change without prior notification.
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