Wednesday, July 1, 2009

Wireless LAN Installation Procedure

> Tools

1. Compass and topographic map
2. Ruler and protractor
3. Pencil, eraser, stationery
4. GPS, Altimeter, klinometer
5. Glasses and glass pantul
6. Radio communication (HT)
7. Orinoco PC Card, pigtail and PCI / ISA adapter
8. Multimeter, SWR, cable tester, solder, tin, cut the cable pliers
9. Peralatan climb, Harness, carabiner, webbing, Cows tail, Pulley
10. Wrench, key ring, key english, pliers (cut, crocodile, jaws), screwdriver set, tie rap, insulator gel, TBA, unibell
11. Power cable roll, UTP straight cable and cross, Crimping tools, RJ45 connectors
12. AP Manager software, Orinoco Client, AP Utility and driver Planet, firmware and operating system (NT, W2K, W98 / ME, Linux, FreeBSD + utilitynya)

> Survey Location

1. Specify the location of the station coordinates, the distance to the BTS with the air GPS and compass on the map
2. Note the mark and point potential barrier (obstructure) along the path
3. Calculate Som, acessories and path loss, EIRP, freznel zone, height of antenna
4. Note the position of another station, the possibility of potential hidden station, over shoot and test noise and interference
5. Determine the ideal position of tower, ELEVATION, long cables and an alternative in case there is difficulty in the installation
6. Plan a number of alternative methods of installation, the tool position and

> Faulty connector

1. Kuliti coaxial cable with a cross section, is the minimum specification cable RG 8 9913 with the calculation of losses each 10 db 30 m
2. Do not leave scratches occur because excessive micro-wave propagation on the surface of the cable is
3. Connect with the careful and full attention to the cleanliness
4. Solder pin connectors with the tip of the careful and tidy, make sure there is no short
5. Note the sequence of the pin holder and so kuncian cable and connector can not be easily shifted
6. Close to the surface of the connector for the aluminum foil to prevent leakage and interference, must stick to a position on the surface of the connector
7. Lapisi connectors with aluminum foil and the entire surface lapisi connection with the connector insulator TBA (normal to the plumbing or electrical cable installation home)
8. Finally, close all the insulator surface with rubber to prevent water
9. For treatment, all resist change every 6 months
10. Connector model is best hexa without solderan and drat so little cable wound surface, which is installed by using Crimping tools, along with protective rubber fuel as a substitute for rubber insulator

>Making Poe

1. Power over Ethernet is required to do the injection power to the device portion Wireless In A Box is installed on the tower, Poe useful to reduce power losses (losses) resulting from the use of cables and connectors
2. Poe uses 2 pair UTP cable is not used, 1 pair for injection + (positive) and power injection for the pair 1 - (negative) power, used the cable pair (a pair) to avoid a decrease in power loss due to cable
3. Note that the most crucial problems in the making Poe is how to prevent the occurrence of short, because the cables and power connectors penampangnya small and easy to move or interested in, tetesi insulator with wax or gel so that each connection point are protected from short
4. Before the first test used all connection with the multimeter

> Installing the Antenna

1. Place the pipe with the method of minimum stack height of up to 1st freznel zone terlewati against obstructure nearest
2. Note the stability of the holder strength pipes and wires, attach the holder to foot and looking up at the tail anker Cows
3. Check all connection cables and connectors including prophylactic lightning when there is
4. Place the antenna with a neat and correct, navigate using the compass and the GPS position of the BTS according to the map
5. Install the cable and trim, not to become a heavy burden of the cable connector and the connection with the movement and position of the antenna pointing
6. Note in install cable in the tower / pipeline, do not have the position of the bend potential accumulation of water into the rain, so that the form of rain water to fall freely under

> The Radio Installation

1. Install the PC Card Orinoco and correctly recognized by the OS without conflict and make sure all drivers and utilities can work perfectly
2. Installing on W2K OS requires the latest driver from the web site and in CD copy utility, is not necessary even if the driver PCMCIA PNP detection W2K do precisely this conflict, remove this dirver's Device Manager
3. Installation on NT requires punctilio allocation IO address, irq and DMA, in the BIOS better turn off all devices (COM, LPT etc). And peripherals (sound card, mpeg etc). Is not required
4. All this procedure can be completed in less than 30 minutes not including the installation of the OS, this time more than immediately execute the next procedure
5. If difficulties continue to occur installation, while for the sake of efficiency to do the installation under OS Win98 / ME is easier and less problem
6. Radio installation on the device type Wireless In A Box (Mtech, Planet, Micronet dlll.), First update the firmware and utilities
7. Then testing of functions, which all have (AP, Inter Building, SAI Client, SAA2, Saa Ad Hoc etc.). Including bridging and IP addressing by using the helical antenna, make sure all functions work well and is stable
8. Make sure that the device Power Over Ethernet (Poe) is running perfectly

> Tests for Noise

1. When all has been running normally, install all the necessary utility and do a test start noise / interference, use the default settings
2. Without notice if there is an antenna signal strength from the station caught the other around, and when there is a good reach (about 40% - 60%) or even more, the station is operating in excess EIRP and potentially cause interference to the station we're building, consider to negotiate with the operator BTS / Existing station is
3. Note how noise level, when more than the radio sensitivity level (usually is around - 83 dBm, read radio specifications), for example - 100 dBm at the station point interferensinya is high enough, to stay whether the received signal strength can exceed the noise
4. Calculation of the standard signal strength is 0% - 40% poor, 40% - 60% good, 60% - 100% excellent, if a received signal strength is 60% but will reach 20% noisenya the connection condition is poor (60% - 20 % - 40% poor), then wherever possible signal strength should reach 80%
5. The connection will usually result in poor PER (packet error rate - can be seen from the percentage number of RTO in continuous ping) over 3% - 7% (seen from the utility and Planet Wave Rider), good in the range of 1% - 3%, and excellent under 1% , PER between the BTS station and the client must be balanced
6. The same calculation can be used to observe the opponent station or BTS us, in principle, signal strength, noise level, PER must have stability to counterbalance the expected connection
7. Consider the alternative scenario a number of other problems if the above can not be solved, eg with a move to another place, pointing the direction to rotate the nearest BTS or other method with 3 point (repeater) dll.

> The antenna assembly

1. Microwave antenna grid parabolic type and loop yagi and the need to built because of a number of components, with different types of patch panels, panel sector and Omni directional
2. Duplex antenna according to the instructions (manual) and the image that included the construction
3. Mur Tighten all bolts and connectors, including and especially the reflector
4. Note that the microwave antenna is very sensitive to changes in focus, the antenna assembly at the time noticed the most of the focus of the reflector horn (antenna driven), small changes will result in a focus on broad changes such as gain (db) antenna
5. Several types of grid parabolic antenna has a stem extender that can change the location of the focus of the reflector so that the horn can be set to gain the necessary

> The antenna pointing

1. In general, the antenna is installed with the horizontal polarization
2. Navigate antenna according to the direction shown compass and GPS, this way we consider a center point direction (center beam)
3. Slide the antenna with a fixed direction to the right and left to center beam, one by one at each stage of the calculation does not exceed ½ specification antenna beam width for each side (left or right), eg 24 db antennas, typically has a beam width 12 degrees then , the maximum shift to the left and right of center beam is 6 degrees
4. Marked changes in each direction and set skornya, determining the best way how to find done with the average value of the best, the main parameters that must be considered is the signal strength, noise and stability
5. Since most radio devices Wireless In A Box does not have a utility for graphically represents signal strength, noise etc. (except for statistics and PER) then make it more practical to use a pointing device standard 802.11b radio that has a graphical utility such as the Orinoco, or use Wave Rider
6. Then if necessary adjust the antenna ELEVATION klino meter in accordance with the antenna on the corner of the station opposite, kelengkungan calculated based on the calculation of the earth and compare it with the contours on the topographic map
7. ELEVATION direction and when the answer has been estimated to reach when needed can be done from the inversion of antenna polarization vertical to the horizontal beam width to narrow the focus and increase the transmission, the second point condition occupy the same antenna (parabolic grid) and the second point must be the same antenna polarization ( means on the side opposite the antenna polarization must also be behind the vertical)

> Testing Connection Radio

1. Do a test signal, similar to the noise, just at the time of this antenna and cable (including Poe) is connected to the radio device
2. Adjust the channel and the name of the SSID (Network Name) to the identity of the BTS / AP goals, as well enkripsinya, when authentication is the MAC Address in the AP must be defined first station's MAC Address
3. When using Radius authentication, make sure the settings are appropriate and try out first before the mechanism is installed
4. Note that most of the radio device is functioning as a bridge and work based on the introduction of the MAC Address, IP Address, so the interface is defined as a utility function based on SNMP protocol only, so no need to include in the routing table
5. Routing table is defined in the (PC) router where radio devices attached to Wireless In A Box from the levying of a separate (PC) router, the device on which the radio device 1 enter the IP Address of the subnet with the IP Address that has been defined in the radio devices, so that the utility is installed in the router can identify the radio
6. Make a continuos ping to test the stability of the connection and know the PER
7. When you are stable and minimum good signal strength (after noise) then do the test troughput connect with the FTP (the FTP client software) to the nearest FTP server (ideally at the point BTS server goals), on average troughput ideal conditions will be better balanced when downloading up and load, the maximum troughput on the radio connection is about 1 Mbps and 600 kbps per TCP connection with MTU 1500 can achieve a maximum 40 kbps
8. Then use mass download manager software that supports TCP connection simultaneously (Concurrent), do the connection to the FTP server in the hope that the nearest maximum troughput 5 kbps per TCP connection, it can be about 120 simultaneous session (Concurrent), asumsinya 5 x 120 = 600
9. Or with a more simple way, used a much smaller scale, 12 Concurrent connection with trouhput kbps 5 per session, what troughput total could reach 60 kbps (average)? achieved when the connection stability can be guaranteed to be at maximum
10. At each level of assessment is done gradually, note whether the RRT ping has increased, a number approaching about 100 ms is still considered reasonable

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