Powerwave Fiber Optics 5. IP Over Fiber IP (Internet Protocol) network is the latest Powerwave network type with UDP/IP protocol and many features, such as wire or fiber connection, PPP, routing capabilities for many sub networks, etc. IP network communication includes communication between network nodes as well as communication between gateway nodes, for instance FON units, and an O&M software. Communication can be initiated either by an O&M software or a network node.
Powerwave Fiber Optics IP Network Terminology In the descriptions of the IP network the terminology in the following table is used. Network type Protocol Network name Link name Link media Link interface IP IP W-net W-link Wire WLI F-net F-link Fiber FLI Abbreviations IP W-net F-net W-link F-link WLI FLI Internet Protocol. Wire network. Fiber network. Wire link. Fiber link. Wire Link Interface. Fiber Link Interface.
Powerwave Fiber Optics Requirements To be able to use an IP network, the FON hardware and software stated below is required. Hardware and software that does not meet the requirements below can be upgraded. FON hardware FON board K129. FON software FON SA102 05/1 version R1A or higher.
Powerwave Fiber Optics F-Net Characteristics The IP communication signal in an F-net is modulated on a sub carrier below the RF modulated signal. The communication transfer rate is 66Kb per second. M S S FON FON FON F-net can be built up with separate downlink and uplink fibers, multi-drop link communication, and a dedicated master node and slave nodes (M and S respectively in the left figure). FO F-net can also be built up with single fiber and full-duplex transmission, see Figure 5-3.
Powerwave Fiber Optics Node Units This section describes an example of node units used for communication between an O&M software and the nodes in a network. A PC workstation loaded with the O&M software and configured with a modem can be connected to all nodes that have an RCC (or RCU) and communicate with other units in connected W-nets and F-nets. Figure 5-4 shows an O&M workstation connected to an F-net, which is also connected to two W-nets.
Powerwave Fiber Optics The FON Unit Net Interfaces This section describes the FON unit in networks, one of the most important subunits in repeater networks. The FON unit is here described as a block with network interfaces. The FON board contains all software and protocols required for both W-net and F-net communication, routing included. A sole FON board can be a complete node in an F-net or W-net. Figure 5-5 shows the FON board with the communication interfaces pointed out.
Powerwave Fiber Optics Network Example An example of a repeater network with FON units is shown in Figure 5-6. BSC BSC BMU/OCM RCC FON WLI BSC FON CU WLI FON FON CU BSC WLI FON BSC FLI FO RCC RCU WLI FON WLI CU RCC WLI FON FON FO FLI FO FLI WLI FON Figure 5-6. Repeater network example This network has a BMU with three FON units as F-net master nodes. Two of which are gateway units. A backbone W-net interconnects the three FON units.
Fiber Optics 5-8 Rev.
Powerwave Fiber Optics 6. Commissioning Read carefully Chapter 1, Safety before commissioning the optical system. See also the safety precautions for the current repeater or hub types. Check all connections made during the installation. Also, ensure that both the mains plugs for repeaters equipped with two power supply units are connected to outlets supplied from the same fuse. To fulfill the IP65 weather protective requirements, ensure that the cable strain relief bushings are properly tightened.
Powerwave Fiber Optics Commissioning the Fiber Optic System Commission the optical transmission system as described in the following instruction. The instruction covers the optical system only and is therefore applicable to all units with optical transmission, for instance BMU, RMU, OCM, FOR, and RH. Figure 6-1 shows a fiber optic system in a BMU and a FOR. These units are also used as examples in the instruction. TX Att.
Powerwave Fiber Optics 7. Measure the optical output power from the FON board (TX) using an optical power meter. Write down the measured power value. It is recommended to set date and time in the FON units, and to assign names to the units for future tracking. Slave Units Continue by performing the following on each slave unit. 8. Make sure the FOR/slave unit is switched off. 9. If two fibers are used, then make sure the uplink and downlink fibers are connected correctly in the FOR/slave unit.
Powerwave Fiber Optics RX DL DPX TX FOR 1 RX FON FON 1 RX TX DPX BMU DC RX Att. UL dBm 0dBm TX Att. RX Att. BTS Figure 6-3. Slave unit downlink path, and uplink path 10. Switch the FOR on and wait until it is in operational mode. 11. Connect an O&M software to the FON board. 12. Measure the optical downlink input power (’RX’ in Figure 6-3). The receiver level is measured via the O&M software (FON status). Write down the measured optical power value. 13.
Powerwave Fiber Optics 18. Move the O&M software back to the repeater and set uplink attenuation and gain. Example of downlink and uplink settings are found in the following table. Unit BMU (FON) FOR (FON) BMU (RF) Downlink 5dB att. 10dB att. 60dB gain Uplink 10dB att. 5dB att. 60dB gain The optical system is now ready for operation. A fine-tuning of the system should be done to get the most out of the system. And, the more nodes in the system the more reason to balance and fine-tune it.
Powerwave Fiber Optics System Configuration Examples Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm 0dB Total UL gain Set values via O&M software. 5dB 0dB Calculated or resultant values. Set and resultant UL gain values in red. 20dB FON BTS initial noise figure –107dBm 0dB 20dB 0dB 20dB RX Att. TX Att. 1.5dBm 1.5dBm BTS initial sensitivity –92.8dBm High, medium, and low values in the example. BTS sensitivity with repeater 1 14.
Powerwave Fiber Optics Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm 0dB Total UL gain Set values via O&M software. 5dB 0dB Calculated or resultant values. Set and resultant UL gain values in red. 20dB FON BTS initial noise figure –107dBm 0dB 20dB 20dB 20dB RX Att. TX Att. 1.5dBm 1.5dBm BTS initial sensitivity –103.3dBm High, medium, and low values in the example. BTS sensitivity with repeater 1 3.
Powerwave Fiber Optics Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm 0dB Total UL gain Set values via O&M software. 5dB 0dB Calculated or resultant values. Set and resultant UL gain values in red. 20dB FON BTS initial noise figure –107dBm 0dB 20dB 5dB 20dB RX Att. TX Att. –6.5dBm 1.5dBm BTS initial sensitivity –101.3dBm High, medium, and low values in the example. BTS sensitivity with repeater 1 5.
Powerwave Fiber Optics Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm 0dB Total UL gain Set values via O&M software. 20dB 5dB 0dB Calculated or resultant values. BTS initial noise figure –107dBm 0dB Set and resultant UL gain values in red. 20dB FON 15dB 20dB RX Att. TX Att. –8.5dBm 1.5dBm BTS initial sensitivity –103.5dBm High, medium, and low values in the example. BTS sensitivity with repeater 1 3.
Powerwave Fiber Optics Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm 0dB Total UL gain Set values via O&M software. 5dB 0dB Calculated or resultant values. Set and resultant UL gain values in red. 20dB FON BTS initial noise figure –107dBm 0dB 20dB 10dB 20dB RX Att. TX Att. 1.5dBm 1.5dBm BTS initial sensitivity –91.7dBm High, medium, and low values in the example. BTS sensitivity with repeater 1 15.
Powerwave Fiber Optics Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm 0dB Total UL gain Set values via O&M software. 5dB 0dB Calculated or resultant values. Set and resultant UL gain values in red. 20dB FON BTS initial noise figure –107dBm 0dB 20dB 5dB 20dB RX Att. TX Att. –6dBm 1.5dBm BTS initial sensitivity –93dBm High, medium, and low values in the example.
Powerwave Fiber Optics Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm –10dB Total UL gain Set values via O&M software. 5dB 0dB Calculated or resultant values. Set and resultant UL gain values in red. 20dB FON BTS initial noise figure –107dBm 0dB 20dB 20dB 20dB RX Att. TX Att. 1.5dBm 1.5dBm BTS initial sensitivity –99.4dBm High, medium, and low values in the example. BTS sensitivity with repeater 1 7.
Powerwave Fiber Optics Legend: TX level 0dB Fixed values. DL BTS UL 0dB BMU 40dBm –10dB Total UL gain Set values via O&M software. 5dB 0dB Calculated or resultant values. Set and resultant UL gain values in red. 20dB FON BTS initial noise figure –107dBm 0dB 20dB 20dB 20dB RX Att. TX Att. –6dBm 1.5dBm BTS initial sensitivity –101.1dBm High, medium, and low values in the example. BTS sensitivity with repeater 1 5.
Fiber Optics 6 - 14 Rev.
Powerwave Fiber Optics 7. Passive Devices This chapter describes those passive components that are used to build optical fiber networks with two or more nodes. These devices are: • • • • VM100 56/EN – User’s Manual OSP, Optical splitters, page 7-2. WDM, wavelength division multiplexers, page 7-4. Fiber optic cables, page 7-6. Fiber optic connectors, page 7-9. Rev.
Powerwave Fiber Optics OSP, Optical Splitter This section describes those types of optical splitters that are used to build repeater fiber networks. These are variants of three port optical splitters, also called beamsplitters or tee couplers. After the general description, the graphic symbol for the optical splitter, and two examples of splitter usages are found. Figure 7-1.
Powerwave Fiber Optics Graphic Symbol 50 30 50 70 70 A 30 C B Figure 7-2. Optical splitter graphic symbol Figure 7-2 shows the following three variants of an optical splitter graphic symbol (according to the EIA/TIA-587): A – A 50/50 percent splitter used for simplex splitting, from the common fiber to the two output fibers. B – A 30/70 percent splitter used for simplex combining, from the two input fibers to the common fiber.
Fiber Optics Powerwave WDM, Wavelength Division Multiplexer This section describes those types of optical multipexers that are used to build repeater fiber networks. These are 1310nm and 1550nm WDMs. After the general description, the graphic symbol for the multiplexer, and an example of WDM usage are found. Figure 7-5.
Powerwave Fiber Optics Bi-directional transmission Bi-directional, or duplex, transmission can be used to simultaneously communicate in both directions over the same fiber. Figure 7-6 shows the principle of this communication type. 1310nm TX – 1310nm RX – 1310nm WDM WDM 1550nm RX – 1550nm TX – 1550nm Figure 7-6. Bi-directional transmission Graphic Symbol DX O Figure 7-7.
Powerwave Fiber Optics Fiber Optic Cables Fiber optic 9/125µm single-mode patch cables for Powerwave repeaters are normally delivered with the system. Recommended backbone cables: Single-mode 9/125µm fiber optic cables. Single-mode 9/125µm fiber optic cables have a very good bandwidth-distance product and a low cable loss, see below. To add cable length, permanent splices are generally used outside buildings while connectors are generally used inside buildings.
Powerwave Fiber Optics The best of the copper coaxial cables, RG-8, has an attenuation of approximately 100dB/ km at a frequency of 300MHz. This means that only 0.00000001% of the source power remains after a distance of 1km. In a 1550nm single-mode fiber cable of the same length, approximately 95% of the source power remains. This example is applicable for a splice-less cable with no other devices connected. Miscellaneous fiber cable characteristics Minimum bend radius for this cable type is 12mm.
Powerwave Fiber Optics Powerwave Patch Cables Powerwave can provide a number of fiber patch cables with connectors for various applications. The following list contains some examples of these fiber cables.
Powerwave Fiber Optics Fiber Optic Connectors There are a number of fiber optic connector types that have different charactersistics, advantages, and disadvantages. There are, however, three basic connector parts that all of these types have in common. These are the connector body, the ferrule, and the coupling device. Figure 7-10 illustrates a typical fiber connector in which these three parts, and other main parts, are pointed out.
Fiber Optics Powerwave Connector Types The most common fiber optic connectors for Powerwave repeaters are briefly described below. DIN These are keyed, spring-loaded connectors with floating sleeves in the couplers. They have threaded coupling nuts. DIN/APC, see APC connectors below. FC The ferrule in a FC connector has face contact (FC) with the joined connector. This type has a threaded coupling nut. FC/APC, see APC connectors below. FC/PC, see PC connectors below.
Powerwave Fiber Optics Handling Connectors Always have in mind that the fiber area in a fiber optic connector is very small. The diameter of the fiber in a single-mode connector is only 9µm. Compared to a human hair, which is between 50 and 75µm, the fiber diameter is only about a seventh of that diameter. This means that a very small particle on the fiber end face causes trouble. A dust particle, 1µm in size, can suspend indefinitely in the air.
Fiber Optics 7 - 12 Rev.
Powerwave Fiber Optics 8. Troubleshooting This troubleshooting guide is applicable to a BMU connected to a BTS. The BMU is also the master unit in a fiber optic network built-up with FON units, one in the BMU and one in each of the connected repeaters. This guide assumes that no gateway is available in the repeater network, and that alarms are indicated via an alarm relay in the BMU. At the BMU site 1. Inspect the BTS and BMU sites.
Fiber Optics Powerwave At the repeater site 7. Repeat from step 2 to step 6 but now in the repeater. 8. If there are further repeaters in the network, then measure the optical output power to the next repeater. If there is no power, then the problem most likely refers to the optic splitter. Replace the FOU unit with the passive devices (keep the FON board). A misfunctioning splitter can also be the cause of lost repeaters between the BMU and the current site. 9.
Powerwave Fiber Optics Index Index A Abbreviations ...................................................................................................... v APC connectors ............................................................................................... 7-10 B BATT, green LED ............................................................................................. Beamsplitter .....................................................................................................
Index Fiber Optics Powerwave L Link ................................................................................................................ 5-2 M Mechanical splice ............................................................................................... 7-7 N Net and link ...................................................................................................... Node units .......................................................................................................
Powerwave Fiber Optics Index lithium battery .............................................................................................. 1-1 polytetrafluoro ethylene ................................................................................. 1-1 PTFE .......................................................................................................... 1-1 SC connectors ................................................................................................. 7-10 Single-Mode Fiber ...
Index Fiber Optics I-4 Rev.
Powerwave Fiber Optics Questionnaire Questionnaire The aim of this manual is to guide you when installing and operating the Powerwave repeaters, and to answer questions that may turn up. To ensure that we provide appropriate information for these purposes, we would appreciate your views and suggestions on how to improve the manual in this direction. Please, fill out the following questionnaire and send it to us.
Questionnaire Powerwave Fiber Optics POSTAGE STAMP Powerwave Technologies Sweden AB Customer Care SE-187 80 Täby Sweden If you prefer to send by mail, fold here and tape. No envelope required. If you prefer to send by fax, use this number: Q-2 Rev.