RC802-120B×2 4E1 Optical Multiplexer User Manual
Contents
1. El OFF OFF ON OFF 2 E OFF OFF ON ON 3 El OFF ON OFF OFF 4 El ON ON ON ON All Ellines Note Only two test method can be set single E1 channel loop back or all E1 channels loop back When single El 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 5 bit Choice of loop back type 5 bit Choice of loop back type OFF Remote loop back enable ON Local loop back enable E1 Error bit tester Local Remote Figure2 sketch map of setting remote loop back on local site Multipl exer Local Remote Figure3 sketch map of setting local loop back on local site Note When any loop back is setting on local site 1 4 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 6 bit DIP switch for Fault Pass Through 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 El output are 1 on local site2. 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 6 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 Chapter 3 Installation and test 3 1 Installation 3 1 1 connecting FEl interface There are two groups DB37 male connectors above every MPU slot of RCO04 16 The first DB37 group from the top is for 1 4 E1 of 1 unit the second DB37 is for 1 4 E1 of 2 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 El 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
3. Figurel RC802 120B xX 2 front panel 2 2 Internal DIP Switch setting 2 2 1 Impedance setting of E1 interface There are 8 groups 4 bit DIP Switch They are UPI UP2 UP3 UP4 ON DW1 DW2 DW3 DW4 The DIP Switch can t be control by NMS So they must be configured manually FF The definition is as following j 1 st pa ga qth 1 st gl an 4h ON ON ON OFF Or OFF OFF OFF ON 75Q unbalanced signal effective 120Q_ balanced signal effective As shown in figure above the default status is set as 75Q unbalanced signal BNC interface effective 75ohm unbalanced besides setting DIP Switch El 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 120o0hm balanced besides setting 8 groups DIP Switch according to the table above El 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 are 2 groups 6 bit DIP Switch on the underside of PCB module Component number is SW1 SW2 SW1 is for 1 unit SW2 is for ee ON The definition is the same to RC801 120B on front panel 6 bit DIP Switch is defined as following OFF 1 4 loop back 1 oe a an Loop back OFF OFF OFF OFF No loop back default OFF OFF OFF ON 1
4. 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 and 10 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 Elchannel is needed first disable the mask function and then connect E1 link 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 wor
5. 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 definition OUT 3 4 70 8 11 j 12 15 16 IN 21 22 25 26 29 30 33 34 Others hang up Twisted pairs can be jointing on DB37 female connector
6. RC802 120B x 2 4E1 Optical Multiplexer User Manual ill Beijing Raisecom science amp technology Ltd Co Content Chapter 1 RC802 120Bx2 Version AL Overview 0 cccescceecceereeereeeeeeeeeeeenes Chapter 2 IN SiTUCtIO Rs uuceter totces saps sitath anatase E E E Chapter 3 Installation and Vest tac faucets eres aloe lece Save tceacmee aed vanueusnrnen Chapter 4 Troubleshooting lt i sexcas oesaceptalcxesaseanes ahandexins coupehaxderenh oetaasecaseomateaneaues Appendix A Introduction of making Cable eee eeeeeeseceeneeceneeeeeeeceeeeeeeeseeeeees Chapter 1 RC802 120B x 2 Version A Overview 1 1 product introduction RC802 120B X 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 owned networks It can be managed by RCOO4 NMS1 inside MPU slot of RCO004 16 1 2 product parameter 1 2 1 El interface characteristic rate 2048Kbps 50ppm line code HDB3 impedance of interface 75Q unbalanced or 1200 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 Lau
7. king 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 El ports are connected well or whether 75 Q cable are reversely connected or whether the wires of 75 Q 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 Appendix
8. nch power 5 dBm Receiving sensitivity 35 dBm Wavelength 1310nm Transmission distance gt 40km 1 2 3 Auxiliary data channel RS232 rate 0 64Kbps 1 2 4 Power supply RCO004 16 chassis provides power supply 1 2 5 Environment Temp 0 45 C Humidity 90 25 C 1 2 6 Dimension RCO004 16 436mm W x440mm H x360mm D 1 3 Interconnection 1 3 1 Slide in module RC802 120 BX 2 one module can connect to two standalone RC801 120B 1 3 2 It is suggested RC802 120B X 2 not connect with other brand name s multiplexers at the optical link but can be connected with Raisecom s other dual fiber multiplexers Chapter 2 Instruction 2 1 Introduction of front panel Top fixed spanner Power indicator Green On built in power working in good condition The row L indicates local The row below indicates Remote E1 LOS alarm red When Elreceiving signal is loss it turns red Optical alarm when receiving signal is loss LOS turns red When receiving signal is error ERR is yellow Some reasons about alarm found in NMS software including LOF error bit rate exceeded 10 and 10 Optical interface For dual strand device optical interface is DSC PC TX means sending RX means receiving 2 unit DOWN the components definition are the same to 1 unit Mask No mask ON Mask unused El s alarm OFF No mask unused E1 s alarm This button enables two units Fixed spanner on bottom
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