DH-PFM881 User Manual All Right Reserved 5.8GHz Wireless Bridge/CPE/AP Model: DH-PFM881 User Manual Version： V1.0.
DH-PFM881 User Manual All Right Reserved Contents Versions .................................................................................................................. 4 References ............................................................................................................. 4 Purpose .................................................................................................................. 4 Notes ................................................................................
DH-PFM881 User Manual 7.4 7.5 7.6 7.7 7.8 All Right Reserved Firewall ........................................................................................................................... 30 IP Aliases ....................................................................................................................... 31 Static Routes ................................................................................................................ 31 Traffic Shaping ................................
DH-PFM881 User Manual All Right Reserved FIGURE 20 WIRELESS................................................................................................................................. 25 FIGURE 21 CONNECTION FIGURE OF ROUTER MODE .................................................................................... 28 FIGURE 22 NETWORK ROUTER MODE ......................................................................................................... 29 FIGURE 23 FIREWALL .............................
DH-PFM881 User Manual All Right Reserved Versions Table 1 Versions Version Date History Author 1.1 2015-07-24 Created Gao Feng Liu Meng 2015-11-04 Update pictures and partial functions description. 1.2 Based on r1563. 1.0.1563 2016-01-04 Update some functions parameters 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.
DH-PFM881 User Manual No. Items All Right Reserved Description transmission range, high date rate and robust transmission. 3 AP Access Point 4 Station(Client) WIFI station that can be associated to an access point. CPE 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.
DH-PFM881 User Manual All Right Reserved 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.
DH-PFM881 User Manual All Right Reserved 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.
DH-PFM881 User Manual W I R E L E Standard IEEE802.11 a/n（2T2R 300Mbps） Operation Frequency 5.745～5.825 GHz(More Non-standard channels is availability,4920MHz-6100MHz) Modulation Mode 802.11 a/n: OFDM Antenna 15dBi Gain Output power ＋24dBm(@6.5Mbps,11a), ＋23dBm(@300Mbps,11n) Receive Sensitivity -72dBm @ 65Mbps, -94dBm@6Mbps 11n:13.5/15/27/30/40.5/45/54/60/81/90/108/120/121.5/135/ S S All Right Reserved Date rate 150/162/180/216/240/270/300Mbps(40MHz Channel Width) 11n:130/117/104/78/65/58.
DH-PFM881 User Manual All Right Reserved and Logs Web based Configuration Supported Firmware Update Supported Bandwidth 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.
DH-PFM881 User Manual All Right Reserved 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.
DH-PFM881 User Manual All Right Reserved Figure 1 DH-PFM881 using examples 1.
DH-PFM881 User Manual All Right Reserved 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.
DH-PFM881 User Manual All Right Reserved 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 WLAN Green ON = Device radio is ON, but not sending or receiving date through the wireless LAN. BLINK= Device radio is ON, and sending or receiving date through the wireless LAN. Red Yellow Link Quality Green Showing the signal strength between the device and the network.
DH-PFM881 User Manual All Right Reserved 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.
DH-PFM881 User Manual All Right Reserved 2.2 Restore to the Factory Settings In some cases, uses can restore the device to the factory settings by the following way in the Figure 4. Push the reset button for 5~10 seconds until all LED is on. This will restore to the factory setting. During this process, the DH-PFM881’s RJ45 ports will be connected and disconnected twice. Figure 4 Restore to the factory settings For default, all the factory settings are shown in the following Table 6.
DH-PFM881 User Manual All Right Reserved 3.1 Log in To log in the DH-PFM881 device, user needs to configure the TCP/IP of your computer first as the following steps: 1、Right click Local Area Connection icon of your computer and click properties, then click Continue, the Local Area Connection Properties dialog box appears as Figure 5.
DH-PFM881 User Manual All Right Reserved Figure 6 IP settings 3、In the above Figure 6, IP address should be set to 192.168.1.*, here * can be a number between 1-255 (but not 36) since the DH-PFM881 default IP address is 192.168.1.36. 4、When the above IP setting is done, input the default IP 192.168.1.36 into the address bar of your web browser, and the following log in interface appears as shown in Figure 7.
DH-PFM881 User Manual All Right Reserved Figure 7 DH-PFM881 Log in interface 3.2 Quick Configuration of the Device The users will see how to configure the DH-PFM881 device quickly in this chapter. 1、 The first page shown after log in is the Status page, which indicates the working status, current setting, software version and other information of the DH-PFM881 device. User can switch to other pages by clicking the left main menus in Figure 8.
DH-PFM881 User Manual All Right Reserved Note: If several DH-PFM881 devices are connected in the Point-to-Point or Point-to-Multi-Point topologies, they must be configured to different IP address to avoid collisions. Figure 9 Wizard-Network 3 、 After finishing the Wizard-Network settings, click next and it goes to Wizard-Wireless page shown in Figure 10. The most used wireless mode is the Access Point and the Station.
DH-PFM881 User Manual All Right Reserved Figure 10 Wizard-Wireless 4、The last page of Wizard is shown in Figure 11. User can click Change to save all the settings, and then click Apply the make the setting effective, or click Last to modify the previous settings. Figure 11 Last Page of Wizard 4 TDMA Currently, most of the outdoor bridge products are developed based on 802.11 protocols, however, it has the limitations of short-distance, hidden node problems, and poor point-to-multi-point performance.
DH-PFM881 User Manual All Right Reserved TDMA technology solves the problems of hidden-node problem in the 802.11 network infra-structure. 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, while stabilize the wireless throughput, thus suitable for long-distance transmission.
DH-PFM881 User Manual All Right Reserved Figure 13 Status 5.1 Status All the configurations in Status page is shown in Table 7.
DH-PFM881 User Manual All Right Reserved the device Link Quality and receiving data. Quality of the connection link Time The real-time 5.2 Monitor Throughput：The figure here monitors the real-time throughput of the wireless link, shown in the following Figure 14. Figure 14 Throughput monitor Route Table：It is stored in a router that lists the routes to particular network destinations, and in some cases, metrics (distances) associated with those routes.
DH-PFM881 User Manual All Right Reserved Figure 16 Bridge Table ARP Table ： It lists the IP address and MAC address of the devices that communicate through the LAN port of the DH-PFM881 device. Figure 17 ARP Table AP/Station Information: Showing the status information of the associated devices. For example, if the DH-PFM881 device is an AP, and the associated device is a Station, and this Station Information shows the related information of the Station device in the Figure 18.
DH-PFM881 User Manual All Right Reserved Figure 19 AP Information of a Station Syslog：Display the log information of DH-PFM881. 6 Wireless Wireless is shown in Figure 20. Figure 20 Wireless Wireless Mode: There are totally 5 wireless modes, including: Station, Access Point, WDS Station, WDS Access Point, and WDS Repeater. Access Point: Access point. Station: A client device that can be connected to an AP.
DH-PFM881 User Manual All Right Reserved WDS Station: Use WDS feature to link multiple APs in a network, all associated stations from any AP can communicate with each other like in ad-hoc mode. WDS station means this device is a station in WDS mode. WDS Access Point： Use WDS feature to link multiple APs in a network, all associated stations from any AP can communicate with each other like in ad-hoc mode. WDS AP means this device is an AP in WDS mode.
DH-PFM881 User Manual All Right Reserved Max TX Rate：Max transmission rate, and it can be used to limit the max transmission rate of a device. Root AP MAC Address：In Station, WDS Station, and WDS Repeater modes, users can use this to limit the APs associated to. Security：User can set the security based on needs to guarantee the wireless security. WPA：Encryption method supported by 802.11 Protocol. 7 Network 7.1 Router mode DH-PFM881 acts as a router when configured to Router mode.
DH-PFM881 User Manual All Right Reserved Figure 21 Connection figure of router mode The Network page is shown in Figure 22.
DH-PFM881 User Manual All Right Reserved Figure 22 Network Router mode Page 29
DH-PFM881 User Manual All Right Reserved WAN Mode：WAN mode can be configured to DHCP/PPPoE/Static IP. When set to DHCP, the device can dynamically get the IP address; otherwise, user needs to manually set the IP address, Netmask, gateway and other information. WAN IP：WAN IP address. It should be set to the same segment of IP address of the internet provided by ISP, please check with the ISP for this information. WAN Netmask：WAN Netmask, use can check with the ISP for this information.
DH-PFM881 User Manual All Right Reserved Figure 23 Firewall 1. Accept one or several devices with particular MAC address. 2. Deny one or several devices with particular MAC address. 3. Accept one or several devices with particular IP address. 4. Deny one or several devices with particular IP address. 7.5 IP Aliases Add multiple IP to a network interface. 7.6 Static Routes This feature can be set to static routing. 7.
DH-PFM881 User Manual All Right Reserved Burst defines the how many bytes allowed for downloading/uploading during a quick time. That leads to momentary throughput can greater than the limit value.
DH-PFM881 User Manual All Right Reserved Below is the table that reflects the relationship between egress rate limit and burst. Egress RateLimit(kbps) Throughput when reach stable Burst(Kbytes) （Mbps） Description 20000 0 18.853 Stable 20000 20 19.021 Stable 20000 200 19.205 Stable 20000 2000 20000 20000 19.2 Hold on 20 seconds at 24.5, then suddenly down to stable 20000 80000 19.2 Hold on several minutes at 24.5, then suddenly down to stable 19.437 From 23.5 down to stable 7.
DH-PFM881 User Manual All Right Reserved Figure 26 VLAN Setting Below is a common usage: Figure 27 VLAN Scenarios 8 Advanced The Advanced page is shown in Figure 28.
DH-PFM881 User Manual All Right Reserved Figure 28 Advanced Auto ACK-Timeout Adjust：It is suggested to enable this function, so that the distance between 2 DH-PFM881 devices can be detected and all the related parameters can be optimized to achieve the best link quality. Distance: The distance can be set manually if the Auto ACK-Timeout Adjust is disabled, otherwise, the distance parameter is not allowed to be set.
DH-PFM881 User Manual All Right Reserved LED configure：This is to configure the signal strength value needed to light on. There are 3 LEDs on DH-PFM881 devices (LED3 value > LED2 value > LED1 value). The default values are -86dBm, -71dBm and -56dBm. When LED1 value < signal strength < LED2 value, LED1 is lighted on; When LED2 value < signal strength < LED3 value, both the LED1 and LED2 are lighted on; When signal strength > LED3 value, all three LEDs are lighted on.
DH-PFM881 User Manual All Right Reserved Upload configuration：When clicking browse, user can choose the backup configuration file and then click upload, so that the configuration stored in the backup file can be applied. Firmware update：Click browse button and choose the file, and then click update button, the firmware can be updated to the latest version. Firmware reboot：Click the Reboot button to reboot the device.
DH-PFM881 User Manual All Right Reserved Figure 30 Tools Ping IP： User can input the destination IP address of another device, and click Ping button. If that destination device is successfully connected to the DH-PFM881 device, the result shows Alive, otherwise shows Not Alive. Time To Restart: Timing restart equipment.
DH-PFM881 User Manual All Right Reserved Ping Watchdog：The ping watchdog sets the DH-PFM881 Device to continuously ping a user-defined IP address (for example, it can be the IP address of the AP the Client is connecting to). If it is unable to ping under the user defined constraints, the DH-PFM881 device will automatically reboot. It is highly recommended that users enable this feature at the side of “Station” and disable this feature at the side of “Access Point”.
DH-PFM881 User Manual All Right Reserved NTP/SNMP：If this NTP server is set, and the DH-PFM881 device can access to this NTP server. DH-PFM881 device automatically calibrate the time and date information with the NTP server and show the time information in the Status page. When SNMP is enabled, use can check the working condition and information of the DH-PFM881 device. IPERF：Test equipment throughput.
DH-PFM881 User Manual All Right Reserved interface IP and equipment is the same segment. After the AC control function is enabled, click save, application, this time the device will take effect on the AC configuration and restart, the device will join AC. After the AC control function is enabled, the user is able to display the current state of the page on the device page. After the AC control function is disabled, the user is able to modify the device's page.
DH-PFM881 User Manual All Right Reserved 1. Configure the 2 DH-PFM881 devices to bridge mode, and disable the firewall, and set different LAN IP for the 2 devices. 2. In wireless menu, configure the 2 devices to AP and station separately, set the same SSID, the same channel bandwidth (20MHz for default), and set the same encryption and password for both of the devices. 3.
DH-PFM881 User Manual y All Right Reserved Configure the encryption method and password to be the same. 3. To verify if the network is correctly setup, please use the computer to connect one of the three devices to ping the IP of any of the other two devices. If the ping is successfully, the network connection works correctly. 13.3 Router Mode In the Router mode, the DH-PFM881 works as a router and the network connection is shown in Figure 34.
DH-PFM881 User Manual All Right Reserved 3. Enable DHCPD. 4. When the above settings are done, use a computer to connect to DH-PFM881 device, and then check whether the connection is successfully. Note: Users can check whether the connection is successfully by ping DH-PFM881 device’s WAN IP address. If the ping is successfully, this connection is successfully. Appendix-A Troubleshooting 1. The device cannot be started after power on. 1.
DH-PFM881 User Manual All Right Reserved Switch to other wireless channel ‘cause there are much interferences in this channel. 3. Turn off the other interference sources Maybe there are other WIFI devices nearby and cause interferences. Try to turn off other WIFI devices nearby, or move DH-PFM881 to another clean environment. 4. The signal strength between 2 DH-PFM881 devices is too weak, and the throughput is low. 1.
DH-PFM881 User Manual All Right Reserved 2. The RJ45 ports are not connected very well. 7. The internet access is lost and the internet speed is low. 1. There are too much stations connected to one AP. 2. AP signal is too weak. 3. There are interference sources nearby. 4. Check the number of users and the max internet speed provided by the ISP.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. Please take attention that changes or modification not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
