DH-PFM881 User Manual All Right Reserved
5.8GHz Wireless Bridge/CPE/AP
Model: DH-PFM881
User Manual
Version： V1.0.1563
DH-PFM881 User Manual All Right Reserved
Contents
Versions .................................................................................................................. 4
References ............................................................................................................. 4
Purpose .................................................................................................................. 4
Notes ...................................................................................................................... 4
Definitions ............................................................................................................. 4
1 Product Overview ................................................................................................. 6
1.1 Product Advantages ....................................................................................................... 6
1.2 Electrical Specifications .................................................................................................. 7
1.3 Package Contents ........................................................................................................... 9
1.4 Features ............................................................................................................................ 9
1.5 Using Example ............................................................................................................... 10
1.6 Applications ................................................................................................................... 11
1.7 Hardware Overview ...................................................................................................... 12
1.8 Understand the DH-PFM881 LEDs ............................................................................. 12
2 Installation ........................................................................................................... 13
2.1 Connections and installation ....................................................................................... 13
2.2 Restore to the Factory Settings ................................................................................... 15
3 Quick Configuration ........................................................................................... 15
3.1 Log in ............................................................................................................................. 16
3.2 Quick Configuration of the Device ............................................................................. 18
4 TDMA ................................................................................................................... 20
5 Status .................................................................................................................... 21
5.1 Status .............................................................................................................................. 22
5.2 Monitor .......................................................................................................................... 23
6 Wireless ................................................................................................................ 25
7 Network ............................................................................................................... 27
7.1 Router mode ................................................................................................................. 27
7.2 Bridge mode .................................................................................................................. 30
7.3 Management ................................................................................................................. 30
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7.4 Firewall ........................................................................................................................... 30
7.5 IP Aliases ....................................................................................................................... 31
7.6 Static Routes ................................................................................................................ 31
7.7 Traffic Shaping ............................................................................................................ 31
7.8 VLAN Settings .............................................................................................................. 33
8 Advanced ............................................................................................................. 34
9 System .................................................................................................................. 36
10 Tools ..................................................................................................................... 37
11 AC Management ............................................................................................ 40
12 Logout .................................................................................................................. 41
13 Network Configuration Examples .................................................................... 41
13.1AP and Station Network .............................................................................................. 41
13.2WDS Access Point, WDS Station, WDS Repeater Network ...................................... 42
13.3Router Mode ................................................................................................................. 43
Appendix-A Troubleshooting ................................................................................... 44
FIGURE 1 DH-PFM881 USING EXAMPLES..................................................................................................11
FIGURE 2 DH-PFM881 LEDS................................................................................................................... 13
FIGURE 3 CONNECTIONS AT BRIDGE MODE.................................................................................................14
FIGURE 4 RESTORE TO THE FACTORY SETTINGS.............................................................................................15
FIGURE 5 LOCAL AREA CONNECTION PROPERTIES....................................................................................... 16
FIGURE 6 IP SETTINGS...............................................................................................................................17
FIGURE 7 DH-PFM881 LOG IN INTERFACE.................................................................................................18
FIGURE 8 STATU S PAGE.............................................................................................................................. 18
FIGURE 9 WIZARD-NETWORK....................................................................................................................19
FIGURE 10 WIZARD-WIRELESS.................................................................................................................. 20
FIGURE 11 LAST PAGE OF WIZARD............................................................................................................. 20
FIGURE 12 TDMA SETTING.......................................................................................................................21
FIGURE 13 STATU S....................................................................................................................................22
FIGURE 14 THROUGHPUT MONITOR...........................................................................................................23
FIGURE 15 ROUTER TABLE......................................................................................................................... 23
FIGURE 16 BRIDGE TABLE.......................................................................................................................... 24
FIGURE 17 ARP TABLE..............................................................................................................................24
FIGURE 18 STA INFORMATION OF AN AP................................................................................................... 24
FIGURE 19 AP INFORMATION OF A STATION ...............................................................................................25
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FIGURE 20 WIRELESS............................................................................................................................... ..25
FIGURE 21 CONNECTION FIGURE OF ROUTER MODE....................................................................................28
FIGURE 22 NETWORK ROUTER MODE.........................................................................................................29
FIGURE 23 FIREWALL.................................................................................................................................31
FIGURE 24 TRAFFIC SHAPING SETTINGS......................................................................................................32
FIGURE 25 VLAN.....................................................................................................................................33
FIGURE 26 VLAN SETTING........................................................................................................................ 34
FIGURE 27 VLAN SCENARIOS................................................................................................................... 34
FIGURE 28 ADVANCED..............................................................................................................................35
FIGURE 29 SYSTEM PAGE........................................................................................................................... 36
FIGURE 30 TOOLS.....................................................................................................................................38
FIGURE 31 AC MANAGEMENT...................................................................................................................40
FIGURE 32 AP AND STATI ON NET WORK......................................................................................................41
FIGURE 33 WDS NETWORK......................................................................................................................42
FIGURE 34 ROUTER MODE......................................................................................................................... 43
TABLE 1 VERSIONS............................................................................................................................... .......4
TABLE 2 DEFINITIONS..................................................................................................................................4
TABLE 3 ELECTRICAL SPECIFICATIONS............................................................................................................7
TABLE 4 HARDWARE INFORMATION............................................................................................................ 12
TABLE 5 LED INFORMATION....................................................................................................................13
TABLE 6 MAIN PARAMETERS AT THE FACTORY SETTINGS................................................................................15
TABLE 7 CONFIGURATIONS SHOWN IN STATUS...........................................................................................22
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Versions
Table 1 Versions
Version Date History Author
1.1 2015-07-24 Created Gao Feng
Update pictures and partial
1.2 2015-11-04
1.0.1563
2016-01-04 Update some functions parameters Liu Meng
functions description.
Based on r1563.
Liu Meng
References
Purpose
This document is proposed for the users of DH-PFM881 devices, helping them to
configure the device and list the troubleshooting, so that the devices can be used
successfully quickly.
This document mainly contains the following parts: hardware information, web
configuration menu descriptions, network configuration examples, and
troubleshooting. It can help the customers quickly be familiar with the devices and
use them correctly.
Notes
This document is to characterize the DH-PFM881 series of devices. Please read the
document carefully before setting up device. Any damage which is caused by
inappropriate use will not be covered under the warranty.
Definitions
Table 2 Definitions
No. Items Description
1 DH-PFM881 Outdoor, long distance AP/CPE/Bridge devices
XTrans is a series of wireless technologies,
2 XTrans
including TDMA, 5M/10M/20M/40MHz bandwidth
support, intelligent rate control, Auto ACK
Time-out adjust, having the advantage of long
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No. Items Description
transmission range, high date rate and robust
transmission.
3 AP Access Point
4 Station(Client)
5 CPE
WIFI station that can be associated to an access
point.
Customer-premises equipment: it is
any terminal and associated equipment located at
a subscriber's premises and connected with
a carrier's telecommunication channel at
the demarcation point.
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1 Product Overview
DH-PFM881 is a powerful WIFI Bridge/AP/CPE device, which allows WIFI access
and video/audio/data transmission device, enables long-range, fast speed and
robust wireless connections. Integrated with the XTrans technology, DH-PFM881
has the advantages of long-distance, high-throughput, and Strong
anti-interference.
XTrans technologies include TDMA, 5M/10M/20M/40MHz bandwidth, intelligent
rate control, Auto ACK Time-Out Adjust and so on. TDMA technology solves the
problems of hidden-node problem in the 802.11 network. 5M/10M/20M/40MHz
bandwidth can be flexibly configured by the uses in different working scenario to
achieve the best link quality. Intelligent rate control algorithm can be adapted to
quick channel quality variations automatically, thus stabilizing the wireless
throughput. ACK Time-Out Auto Adjust can automatically detect the distances of
the DH-PFM881 devices, and thus adjust the wireless parameters to achieve the
best wireless link quality.
The best transmission range and max speed of DH-PFM881 can be as high as
15Km and 300Mbps, making it suitable for many applications of WIFI Bridge/CPE,
especially have advantages for point-to-multi-point communication.
1.1 Product Advantages
The DH-PFM881 has the industrial leading technology, owing the performance
capability of a wireless base station with only a small form factor, furthermore, it
has very attractive low cost.
DH-PFM881 has the following advantages compared to the competitors:
1. Embedded TDMA technology
DH-PFM881 devices is embedded with TDMA technology, including TDMA,
5/10/20/40MHz bandwidth, intelligent rate control, Auto ACK Time-out adjust.
They make the device have longer transmission distance, higher throughput and
better point-to-multi-point performance.
2. Longer transmission distance, higher throughput
The longest transmission distance of DH-PFM881 can be as far as 15 km, and the
max throughput can be 300Mbps. It can satisfy the needs of most of the
applications.
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3. Embedded hardware watchdog
DH-PFM881 is embedded with hardware watchdog, which is used to monitor the
working status of the device. Once the system is not working properly, the
DH-PFM881 device can be rebooted to guarantee the stability of the system.
4. Software Ping watchdog function
DH-PFM881 software ping watchdog function enable the device periodically ping
another device associated to, so that it can detect if the system is working well. If
the wireless link is lost or there is any problem, the device is rebooted. This is
important because the devices can be restored to work automatically if there is
any problem, and avoid the extra human labour to maintain the outdoor devices.
5. More Non-standard channels availability
Currently most of the WIFI devices are working at standard 802.11 5.8GHz
frequency. However, standard 802.11 5.8GHz only provide limited channels, and
there is serious interference if there are a lot of 5.8G WIFI devices nearby.
DH-PFM881 support more channels near 5.8GHz band, and spread the band to
non-standard frequency part: 4920MHz-6100MHz。The advantage of working at
the non-standard band is to avoid the interference in the standard channels, and
the wireless throughput can be improved.
Note: Please confirm whether those non-standard channels are permitted locally
before using them.
6. Outdoor industrial product
DH-PFM881 device can work at all kinds of outdoor severe environments,
including -30 to 70 degree temperature, 5% to 95% humidity, while maintain good
performance.
1.2 Electrical Specifications
The electrical specifications are shown are the following table:
Table 3 Electrical Specifications
Items Specifications
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Standard IEEE802.11 a/n
Operation
Frequency
Modulation
W
Mode
I
Antenna 15dBi Gain
R
Output power
E
Receive
L
Sensitivity
E
S
S
Date rate
5.745～5.825 GHz(More Non-standard channels is
availability,4920MHz-6100MHz)
802.11 a/n: OFDM
＋24dBm(@6.5Mbps,11a), ＋23dBm(@300Mbps,11n)
-72dBm @ 65Mbps, -94dBm@6Mbps
11n:13.5/15/27/30/40.5/45/54/60/81/90/108/120/121.5/135/
150/162/180/216/240/270/300Mbps(40MHz Channel Width)
11n:130/117/104/78/65/58.5/52/39/26/13/6.5Mbps(20MHz
Channel Width)
（2T2R 300Mbps）
：11a 54/48/36/24/18/12/9/6Mbps(adaptive)
Distance Outdoor open area: <15 km
Power supply 24V POE
H
Interface POE
A
LED WIFI Status/LAN/Power/Signal strength
R
Operation
D
Temperature
W
Storage
Temperature
A
Operation
R
Humidity
E
Device Size 280*80*30(mm)
Encryption 802.1x/WPA-PSK/WPA2-PSK
Network Router/Bridge
S
Operation
O
Mode
F
Security MAC filter, SSID hidden
T
Network
W
protocol
-30℃～+70℃
-40℃～+85℃
～%95%RH
5
Access Point/Station/WDS Access Point /WDS Station/WDS
Repeater
TCP/UDP/ARP/ICMP/DHCP/HTTP/NTP
A
TDMA
R
Auto ACK
E
timing Adjust
Management
Supported (Avoid 802.11 hidden-node problems, and
improve the point-to-multi-point performance)
Supported
NTP, SNMP, Syslog, Telnet
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and Logs
Web based
Configuration
Firmware
Update
Bandwidth
supported
Supported
Supported
5M/10M/20M/40MHz
1.3 Package Contents
Open the package carefully, and make sure that none of the following items listed
are missing：
y One DH-PFM881 device
y One 24V/0.5A POE power adapter
y DH-PFM881 Mast-Mount Strap Special Screw Set
1.4 Features
y High performance 802.11n 2×2 MIMO chip
y Best transmission range: 15Km, and max transmission throughput:
300Mbps
y Integrated XTrans technology, including TDMA, intelligent rate control,
Auto ACK Time-out adjust
y TDMA solves the problems of hidden-node problem in the 802.11
network, thus having better long-distance and PTMP performance
y Support 5 operation mode: Access Point, Station, WDS Access Point, WDS
Station, WDS Repeater
y Support point-to-point, point-to-multipoint connection
y Unique RF and antenna design enables long-range transmission
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y Wireless multimedia optimization technology guarantees video/audio
transmission QoS
y Web based working scenario selection makes the installation and setting
much easier
y Reliable POE power supply, support 802.3af standard
y Web-based configuration, easy to use
y Waterproof housing and accessory kit protects
1.5 Using Example
The DH-PFM881 usage example are shown in Figure 1, it can be used as WIFI AP,
CPE, or outdoor PTP, PTMP topology. Therefore, DH-PFM881 is suitable for
various applications like wireless video transmission, and wireless signal coverage.
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Figure 1 DH-PFM881 using examples
1.6 Applications
DH-PFM881 can be used widely in the following applications:
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y Wireless video surveillance (free-way, city, police, oil pipeline, forest and
etc.)
y Carrier wireless backhaul and rural area internet last-mile wireless solution
y Enterprise local area network inter-connection
y WIFI signal coverage and rural wireless coverage
1.7 Hardware Overview
DH-PFM881’s hardware information is described in the following Table 4:
Table 4 Hardware information
Hardware Specifications
CPU/Baseband Radio Atheros AR9344
Memory 64MB DRAM, 8MB Flash
Physical Interface 2×10/100M Base-TX (Cat. 5/5E, RJ-45)
Ports
LED Status Power, LAN, WLAN, 3×Link Quality
Power supply POE, Power Adapter 24V/0.5A
1.8 Understand the DH-PFM881 LEDs
The LEDs of DH-PFM881 can be divided to 2 groups. One group of LEDs are
Indicators, including the left 3 LEDs of Figure 2, and they are Power, LAN and
WAN indicators. The other group of LEDs are Link Quality, including the right 3
LEDs of Figure 2, shown the signal strength.
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Figure 2 DH-PFM881 LEDs
Table 5 LED Information
LED Color Status
POWER Green ON = Device Power on
LAN Green ON = Device connected to the network
OFF = Device radio is OFF
ON = Device radio is ON, but not sending
WLAN Green
Red
Link Quality
Yellow
Green
or receiving date through the wireless LAN.
BLINK= Device radio is ON, and sending or
receiving date through the wireless LAN.
Showing the signal strength between the
device and the network.
Green is ON = good quality
Yellow is ON = medium quality
Red = poor quality or no link
2 Installation
This chapter describes how to install DH-PFM881 device in the bridge mode, and
the installation method of router mode can be seen in Chapter 7.
2.1 Connections and installation
The connection of DH-PFM881 device to POE and power supply is shown in Figure
3.
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Figure 3 Connections at Bridge mode
DH-PFM881 has 2 RJ45 ports, and they are marked with “POE” and “LAN2”
separately. In the bridge mode, please connect the device with the POE power
adaptor in the following way:
1) Remove the bottom cover from the DH-PFM881 device, and you will see
there are 2 RJ45 ports marked with “POE” and “LAN2”.
2) Using an Ethernet cable to connect the POE power adaptor and the “POE”
port of the DH-PFM881 device.
3) Connect the POE adaptor to the normal power supply board.
4) Normally, “LAN2” port of the DH-PFM881 can be connected to IP Camera
and other devices, or leave it unconnected
5) Mount the DH-PFM881 securely to the pole by locking the strap tightly.
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