![D-Link DWL-1800R [64/77] Free space loss](/img/pdf.png)
D-Link DWL-1800R [64/77] Free space loss
![D-Link DWL-1800R [64/77] Free space loss](/views2/1044813/page64/bg40.png)
59
Free Space Loss
Attenuation of the electromagnetic wave while propagating through space. This
attenuation is calculated using the following formula:
Free space loss = 32.4 + 20xLog(F
MHz
) + 20xLog(R
Km
)
F is the RF frequency expressed in MHz.
R is the distance between the transmitting and receiving antennas (expressed in
Km).
At 2.4 GHz, this formula is: 100+20xLog(R
Km
)
Содержание
- Table of contents 2
- Table of figures 4
- Table of tables 5
- General 6
- Introduction 6
- System description 6
- Using this guide 6
- D link air premier dwl 1800 functional description 7
- Dwl 1800b bu wireless base unit 7
- D link air premier dwl 1800 compatibility and standards 8
- Dwl 1800r rb wireless bridge 8
- Installation 9
- Installation overview 9
- Packing list 9
- Note use a straight ethernet cable to connect the indoor unit to a hub or 10
- Outdoor installation considerations 10
- This chapter describes various considerations to take into account when planning an outdoor installation including site selection antenna alignment antenna polarization and cell size 10
- Use a crossed cable to connect it directly to a pc s network interface card nic 10
- Collocating dwl 1800 outdoor units 11
- Path of clearest propagation 11
- Physical obstacles 11
- Site selection factors 11
- Antennas for outdoor applications 12
- Path loss 12
- Point to multipoint 12
- Point to point 12
- Rooftop installation 12
- Antenna polarization 13
- Antenna polarization must be the same at both ends of the link in most applications the preferred orientation is vertical polarization which is best for above ground propagation 13
- Cell size is determined by the maximum possible distance between the dwl 1800b and a dwl 1800r unit for open outdoor areas with an unobstructed line of sight between the bu dwl 1800b and the dwl 1800r units the suggested maximum distance is up to 6 miles 10km where etsi is the regulatory domain and 15 miles 25 km where fcc is the regulatory domain 13
- Cell size link distance 13
- Central offices 13
- Outdoor installations must have a clear line of sight between antennas solid obstacles such as buildings or hills can prevent the establishment of a link while partial obstacles such as trees or traffic can reduce range extended coaxial cables can cause an increase in signal loss and a reduction in range 13
- Precautions 13
- Specific range tables guidelines and information about extended cables can be obtained from your local dealer or the 13
- Using outdoor range tables 13
- Compliance with radio regulations 14
- Installing the outdoor unit 14
- Connect one end of the grounding cable to the ground terminal and connect the other end to a good ground connection 16
- Connecting the ground and antenna cables 16
- Connecting the indoor to outdoor cable 16
- Grooves pointing outwards these grooves are intended to allow fastening of the screws with a screwdriver 16
- Is located on the bottom panel of the outdoor unit 16
- Note when inserting the open ended screws make sure to insert them with the 16
- Remove the two screws holding the waterproof seal to the outdoor unit and remove the waterproof seal 2 unscrew the top nut from the waterproof seal 16
- The ground terminal marked 16
- Installing the indoor unit 17
- After connecting the outdoor unit to the indoor unit using the indoor to outdoor cable connect the power cord to the unit s ac socket located on the bottom panel shown in figure 7 connect the other end of the power cord to the ac mains after verifying that the unit is rated for the voltage in the country of use the ac rating is indicated on the bottom panel of the indoor unit 18
- Antenna alignment 19
- Before aligning the antenna certain key parameters must be configured to enable connectivity with linked units see unit configuration mode on page 209 for more information 19
- Configuring parameters 19
- Verifying correct operation 21
- Verifying correct operation of the indoor unit 21
- Verifying correct operation of the outdoor unit 22
- The d link air premier dwl 1800 configuration utility 23
- Configuration utility modes 24
- Installing and running the configuration utility 24
- The configuration utility is provided for installation on a 3 diskette 1 insert the provided diskette into the computer where you wish to install the configuration utility 2 run brzmgr mgr exe 3 follow all instructions until you are informed that the utility was installed successfully 4 run the configuration utility from the start menu by selecting it in the d link airpremier dwl 1800 configuration utility folder under programs 24
- Unit configuration mode 25
- The control window 26
- Application control buttons 28
- Configuration utility tabs 29
- The tx success and tx fail counters displayed at the end of the counters list are link specific to activate these counters for a specific link select the mac address of the unit at the other end of the link and click apply when you click the reset counters button these counters are actually reset unlike the other counters which are only reset on screen 33
- Default channel max output power 36
- Default output power 36
- Etsi 1 13 7 14 4 36
- Fcc 1 11 6 24 24 36
- Regulatory domain lowest channel 36
- Telec 1 13 7 36
- Canada 1 11 6 24 24 37
- France 10 13 11 14 4 37
- Firmware upgrade mode 42
- All configured parameters are saved during the upgrade download procedure all configured parameters are saved during the upgrade download procedure 44
- At the end of the upgrade session the following window is displayed indicating that the operation was successful 44
- Completed 44
- Indicating the progress of the operation if both dwl 1800b and dwl 1800r devices are selected the program will upgrade dwl 1800r units first 44
- Note do not disconnect any cables or try to stop the process before downloading is 44
- Advanced tftp settings 45
- Session retries defines the number of times a tftp session will be repeated before the firmware upgrade operation is designated a failure the range is 1 5 retries with a default of 3 retries 45
- Multiple unit configuration mode 46
- Reloading factory default settings 47
- Resetting the snmp community strings 47
- System troubleshooting 48
- The following troubleshooting guide provides answers to some of the more common problems that may occur when installing and using the d link air premier dwl 1800 if problems not mentioned in this guide should arise checking the ethernet and wlan counters may help see section 3 if the problem persists please feel free to contact your local distributor or the d link technical support department 48
- Troubleshooting guide 48
- Configuration and management 50
- Supported standards 50
- Technical specifications 50
- Interfaces 51
- Outdoor unit to indoor unit communication 51
- Security 51
- Electrical 52
- Environmental 53
- Mechanical dimensions 53
- Standards compliance general 53
- Appendix a dwl 1800 faq 54
- General 54
- Does the dwl 1800b supports 802 d spanning tree protocol 55
- Is the d link air premier dwl 1800 compatible with other d link wireless equipment from other vendors 55
- What is the best value for the cw min parameter on the dwl 1800 55
- What is the normal per packet error rate for the dwl 1800b dwl 1800r 55
- Can a frequency hopping network operate in the same area as the d link air premier dwl 1800 56
- Can i use d link air premier dwl 1800 bridges to feed a frequency hopping distribution point 56
- Collocation 56
- How many dwl 1800b or dwl 1800r units can be collocated on the same building or tower 56
- Performance 57
- What if the d link air premier dwl 1800 link experiences interference 57
- What is the throughput of the d link air premier dwl 1800 57
- What is the typical latency of a dwl 1800b dwl 1800r 57
- Can d link air premier dwl 1800 firmware be downgraded 58
- Can the dwl 1800b dwl 1800r firmware be upgraded 58
- Can the dwl 1800b dwl 1800r flash be erased or the firmware changed by an unauthorized person 58
- Can the firmware flash be corrupted when upgrading to a new version 58
- Firmware 58
- When does the back up flash image get upgraded 58
- Can the regulatory domain country of a dwl 1800 unit be changed 59
- Configuration 59
- How can the dwl 1800 be configured or managed if the snmp community name has been forgotten 59
- How can the dwl 1800 unit be returned to factory default settings 59
- Does the dwl 1800 offer out of band management 60
- Management 60
- What installation and site survey tools are available for dwl 1800 dwl 1800 60
- What management options are available for the dwl 1800 60
- Appendix b preparing the indoor to outdoor cable 61
- Appendix c radio signal propagation 62
- Introduction 62
- Rf terms and definitions 62
- Attenuation 63
- For example if due to attenuation half the power is lost 63
- Path loss 63
- Rf power level 63
- Free space loss 64
- Antenna characteristics 65
- System characteristics 66
- Signal fading 67
- D distance between sites expressed in km 68
- The line of sight concept 68
- Wavelength expressed in feet 68
- Avertissement aux utilisateurs 71
- Warning 71
- Limited hardware warranty d link warrants that the hardware portion of the d link products described below hardware will be free from material defects in workmanship and materials from the date of original retail purchase of the hardware for the period set forth below applicable to the product type warranty period if the hardware is used and serviced in accordance with applicable documentation provided that a completed registration card is returned to an authorized d link service office within ninety 90 days after the date of original retail purchase of the hardware if a completed registration card is not received by an authorized d link service office within such ninety 90 period then the warranty period shall be ninety 90 days from the date of purchase product type warranty period 72
- Limited warranty 72
- Ninety 90 days 72
- One 1 year 72
- Power supplies and fans one 1 year 72
- Attie d link co z 75
- Dssqa tsc dlinktw com t 75
- Info dlink co u 75
- Info dlink com a 75
- Info dlink com s 75
- Info dlink d 75
- Info dlink s 75
- Kida d link co j 75
- Offices 75
- Service dlink india co 75
- Support dlink me co 75
- Vl dlink r 75
- Www d link co za 75
- Www dlink cl 75
- Www dlink ru 75
- Www dlinktw com tw 75
- Registration card 76
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