Raisecom | RC802-240B | RC802-240B 8 E1 module optical multiplexer User Manual

RC802-240B
8 E1 module optical multiplexer
User Manual
Beijing Raisecom science and technology Ltd. Co
Content
Chapter 1 RC802-240B(Version C)Overview.................................................. 1
Chapter 2 Instruction .............................................................................................. 2
Chapter 3 Installation and test ................................................................................ 5
Chapter 4 Troubleshooting ..................................................................................... 6
Appendix A Introduction of making cable............................................................. 7
Chapter 1 RC802-240B(Version C)Overview
1.1 product introduction
RC802-120B×2 is an ideal transmission device of optical fiber for point to point networks,
middle and small capacity networks, such as wireless communication base stations, private
communication networks and switch networks. It can be applied to either public networks or
various private networks. It can be managed by RC004-NMS1 inside MPU slot of RC004-16
1.2 product parameter
1.2.1 E1 interface characteristic:
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
1.2.2 Optical interface characteristic:
rate:
100Mbps
line code:
4B5B
fiber connector:SC
Optical transmission:
Launch power:≥-5 dBm
Receiving sensitivity:≤-35 dBm
Wavelength:1310nm
Transmission distance:>40km
1.2.3 Auxiliary data channel
RS232,rate:0~64Kbps
1.2.4 Power supply
RC004-16 chassis provides power supply
1.2.5 Environment
Temp:0 ~ 45℃
Humidity:≤90%(25℃)
1.2.6 Dimension
RC004-16:436mm(W)×440mm(H)×360mm(D)
1.3 Interconnection
1.3.1 Slide-in module RC802-240B can work in pair with standalone RC801-240B.
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Chapter 2 Instruction
2.1 Introduction of front panel
The top fixed spanner
PWR
Power indicator(Green):On, built-in power working in good condition
R
The row (L) indicates “local”
The row below indicates “Remote”
L
1
2
3
LOS
4
5
E1 LOS alarm(red): receiving signal of E1 channel is loss,it turns red
6
7
8
LOS
Optical alarm:
LOS alarm (red): when receiving signal is loss, it turns red
LOF
LOF alarm (red): When optical receiving frames lose synchronization, the
E-3
alarm indicator turns on.
E-6
E-3 serious error bit alarm exceeds 10-3(red): it is flashing.
E-6 serious error bit alarm exceeds 10-6(yellow): it turns yellow
TX
RX
Optical interface: For dual-strand device,optical interface is
DSC/PC. TX means sending,RX means receiving.
RS232
Auxiliary channel: asyc RS232,rate 0~64Kbps
MASK
Mask/ No mask:
“ON”: Mask unused E1' s alarm; “OFF”: No mask unused E1' s alarm.
Fixed spanner
Figure 1 sketch map of RC802-240B
As shown figure 1, all alarms of E1 are receiving signal alarm. The alarm of remote site is sent
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by fiber. So remote alarm is only right when optical interface is available.
ON
2.2 Internal DIP-Switch setting
2.2.1 Impedance setting of E1 interface
There are 8 groups 4-bit DIP-Switch, the number of component is S1~S8. OFF
1234
These switches can’t be controlled by NMS. So they can be done
manually.
The definition is as following:
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”.
75ohm unbalanced: besides setting DIP-Switch, E1 interface should be installed CC4B-8G
coax adapter on DB37 connector; this adapter converts DB37 interface to eight CC3 coax
connector. It fits 4 E1 channel input and 4 E1 channel output.
120ohm balanced: besides setting 8 groups DIP-Switch according to the table above, E1
interface should be plugged DB37 connector to fetch twisted pairs. About line order of DB37
for twisted pairs to see appendix A.
2.2.2 DIP-Switch setting
There is a group 6-bit DIP-Switch on module PCB, the series number is
ON
S9
The definition for 6-bit DIP-Switch
OFF
123456
1st ~4th bit: loop-back
st
nd
rd
th
1
2
3
4
Loop-back
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
OFF
ON
OFF
ON
5th E1
OFF
ON
ON
OFF
6th E1
OFF
ON
ON
ON
7th E1
ON
OFF
OFF
OFF
8th E1
ON
ON
ON
ON
All E1 lines
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 are working
without disturbance.
When it is default status, loop-back can be configured directly by NMS.
5th bit:Choice of loop-back type
5th bit
Choice of loop-back type
OFF
Remote loop-back enable
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ON
Local loop-back enable
Fiber
Multipl
exer
Error bit tester
Multipl
exer
E1
E1
Local
Remote
Figure2: sketch map of setting remote loop-back on local site
Fiber
Error bit tester
Multipl
exer
Multipl
exer
E1
E1
Local
Remote
Figure3: sketch map of setting local loop-back on local site
Note:When any loop-back is setting on local site, 1st ~4th loop- back DIP-switch of remote site
must be all off.
DIP-Switch of remote loop-back default setting is configured as enable. This status can neither be
inquired nor controlled by NMS. So it should not be modified. Only when you test device’s
performance right or not, DIP-Switch is for auxiliary function. Please keep default setting when
loop-back is controlled by NMS.
6th bit:DIP-switch for FPT
When FPT is disabled,it’s similar to AIS of traditional multiplexers. When E1 signal on remote site
is lost,the E1 output opposite of local site is “1”;when optical signal at local site is lost ,all E1
output are “1” on local site.
FPT enable: when there is alarm of LOS on any direction of optical interface,both sides E1 output
can not transmit HDB3 coding. At this circumstance, alarm on terminal device (such as switches,
converters, SDH) of E1 link will be LOS,not AIS alarm.
6th bit
FPT
OFF
Disable(complies with AIS )
ON
Enable
This function is for some special need. It can be inquired, but can’t be controlled. So if it is
required to start, it must be forced manually.
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Chapter 3 Installation and test
3.1 Installation
3.1.1 connecting
E1 interface
There are two groups DB37 male connectors above every MPU slot of RC004-16. The first
DB37 group from the top is for 1~4 E1 of 1st unit; the second DB37 is for 1~4 E1 of 2nd unit.
75ohm unbalanced: CC4B-8G adapter is installed on DB37 male connector.
CC3-K3 coax cable on adapter. It is suggested to connect with SYV 75-2-2 for 75ohm
unbalanced.
120ohm balanced: it can be installed DB37 female adapter with twisted pair cable for E1
output/input on DB37 male connector on our PDH.
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.
3.1.3 Power supply connection
Open PWR of RC004-16.
When it is electrified, it is necessary to confirm no alarm on optical interface at first. There is
no LOS alarm if optical interface is right. ERR is yellow when device is just electrified. The reason
is that the moment of current coming can bring a little error bit. After 10~20 seconds, ERR is off.
ERR includes LOS, LOF, 10-3 and 10-6.
3.1.4 Mask unused E1 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.
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Chapter 4 Troubleshooting
If there are any problems during installation and using, try the following proposals. If the problems
can still not be solved, please contact distributors or hot-line technical support 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.
Green PWR indicator not on
Answer: PS faults. Check whether PS is working properly and –48 PS connection is not reversed.
LOS red indicator of optical port 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.
Optical interface ERR on
Answer: It is normal that ERR alarm occurs for 10 seconds just after turning on the power, after 10
seconds the ERR indicator will be off. If ERR alarm occurs during operation, check whether optical
RX port connects well and RX optical power.
LOS red indicator of E1 sub-channel 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 cable are reversely connected, or whether the wires
of 75 Ω cable 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.
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.
How to take cable off from connector
Answer: push the part that is the biggest diameter of connector; don’t twist. Then pull off.
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Appendix A Introduction of making cable
75ohm adopting DB37 coax adapter:
It is suggested to connect with SYV 75-2-2 coax cable. The distance is less than 200 meters.
120ohm DB37 male connector is defined as following:
DB37 pin
2nd
3rd
4th
1st
definition
OUT
3、4
7、8
11、12
15、16
IN
21、22
25、26
29、30
33、34
Others hang up. Twisted pairs can be jointing on DB37 female connector.
Making cable of auxiliary channel
Auxiliary channel RS232 cable
Adopting RJ45 interface, pins defined as following:
3
——RXD 232 signal input
6
——TXD 232 signal output
4、5——GND
others — hang up
RS232 (RJ45) interface is connected to computer’s console (DB9 female connector), line order
as following:
RJ45
DB9F
3
←—
3
6
—→
2
4、5
——
5
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