Chapter 4: Reference information Country specific frequency range Frequency range 5.8 GHz band Table 213 Frequency range per country – 5.8 GHz band PMP/PTP 450i Series Countries USA, Antenna Type Any Canada, Brazil, Other FCC Mexico Other ETSI Any Any Any Channel BW Channel center Frequency limits (MHz) Lower Upper 5 MHz 5730 5845 10 MHz 5730 5845 15 MHz 5732.5 5842.5 20 MHz 5735 5840 30 MHz 5740 5835 40 MHz 5745 5830 5 MHz 5727.5 5847.5 10 MHz 5730 5845 15 MHz 5732.
Chapter 4: Reference information Country specific frequency range Table 214 Frequency range per country – 5.8 GHz band PMP 450b Mid-GainSeries Countries Antenna Type Channel BW FCC 16 dBi Mid-Gain Channel center Frequency limits (MHz) Lower Upper 5 MHz 5730 5845 10 MHz 5730 5845 15 MHz 5732.5 5842.5 20 MHz 5735 5840 30 MHz 5740 5835 40 MHz 5745 5830 Table 215 Frequency range per country – 5.
Chapter 4: Reference information Countries Antenna Type Country specific frequency range Channel BW Lower Upper 5745 5775 5835 5830 10 MHz 5760 5870 15 MHz 5762.5 5867.5 20 MHz 5765 5865 30 MHz 5770 5860 40 MHz 5775 5855 5730 5790 5820 5850 5732.5 5787.5 5822.5 5847.5 5735 5785 5825 5845 5740 5780 5830 5840 5745 5775 5835 5835 10 MHz 5730 5790 15 MHz 5732.5 5787.5 20 MHz 5735 5785 30 MHz 5740 5780 40 MHz 5745 5775 10 MHz 5730 5870 15 MHz 5732.
Chapter 4: Reference information Countries Antenna Type Country specific frequency range Channel BW Lower Upper 5732.5 5787.5 5822.5 5867.5 5735 5785 5825 5865 5740 5780 5830 5860 5745 5775 5835 5855 5 MHz 5727.5 5847.5 10 MHz 5730 5845 15 MHz 5732.5 5842.5 20 MHz 5735 5840 30 MHz 5740 5835 40 MHz 5745 5830 5 MHz 5727.5 5847.5 10 MHz 5730 5845 15 MHz 5732.5 5842.5 20 MHz 5735 5840 30 MHz 5740 5835 40 MHz 5745 5830 5 MHz 5727.5 5872.
Chapter 4: Reference information Countries Indonesia Malaysia Antenna Type Any Any Country specific frequency range Channel BW Channel center Frequency limits (MHz) Lower Upper 20 MHz 5735 5840 30 MHz 5740 5835 40 MHz 5745 5830 5 MHz 5727.5 5822.5 10 MHz 5730 5820 15 MHz 5732.5 5817.5 20 MHz 5735 5815 5 MHz 5727.5 5872.
Chapter 4: Reference information Country specific frequency range Table 217 Frequency range per country – 5.8 GHz band PMP 450m Series Countries United States, Antenna Type Any FCC ETSI Other Any Any Channel BW Channel center Frequency limits (MHz) Lower Upper 5 MHz 5730 5845 10 MHz 5730 5845 15 MHz 5732.5 5842.5 20 MHz 5735 5840 30 MHz 5740 5835 40 MHz 5745 5830 5 MHz 5727.5 5872.5 10 MHz 5730 5870 15 MHz 5735 5867.5 20 MHz 5737.
Chapter 4: Reference information FCC specific information FCC specific information FCC compliance testing With GPS synchronization installed, the system has been tested for compliance to US (FCC) specifications. It has been shown to comply with the limits for emitted spurious radiation for a Class B digital device, pursuant to Part 15 of the FCC Rules in the USA. These limits have been designed to provide reasonable protection against harmful interference.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Band Bandwidth Frequencies Maximum Combined Tx Output Power 5 MHz 3452.5 – 3647.5 MHz 25 dBm 7 MHz 3453.5 – 3646.5 MHz 25 dBm 10 MHz 3455.0 – 3645 MHz 25 dBm 15 MHz 3457.5 – 3642.5 MHz 25 dBm 20 MHz 3460.0 – 3640 MHz 25 dBm 30 MHz 3465.0 – 3635 MHz 25 dBm 40 MHz 3470.0 – 3630 MHz 25 dBm and 5 MHz 3652.5 -3697.5 MHz 19 dBm Z8H89FT 7 MHz 3653.5 – 3696.5 MHz 21 dBm 10 MHz 3655.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Frequencies Band Bandwidth Maximum Combined Tx Output Power 3670.0 – 3680.0 40 MHz MHz 5 MHz 4942.5 – 4987.5 MHz 4945.0 – 4985.0 10 MHz 4.9 GHz (PMP/PTP 450i only) MHz 15 MHz 4947.5 – 4982.5 MHz 4950.0 – 4980.0 20 MHz MHz 30 MHz 40 MHz 0001, Z8H89FT 0002 and QWP50450I 5 GHz PMP 450/ 27 dBm 27 dBm 27 dBm 27 dBm 4955.0 – 4975.0 MHz 27 dBm 4960.0 – 4970.0 27 dBm MHz 5 MHz 5160.0 – 5247.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Frequencies Band Bandwidth Maximum Combined Tx Output Power 20 MHz 5482.5 – 5715.0 MHz 27 dBm Note For 20 MHz, center frequency at 5495.0 is the lowest allowed at full power and the maximum power for edge frequency is limited to 17 dBm. 30 MHz 5487.5 – 5710 MHz 27 dBm Note For 30 MHz, center frequency at 5495.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Band Bandwidth Frequencies Maximum Combined Tx Output Power 5740.0 – 5860.0 30 MHz 4.9 GHz MHz 40 MHz 5745.0 – 5855.0 MHz 26 dBm 5 MHz 4942.5 – 4987.5 MHz 26 dBm 4945.0 – 4985.0 10 MHz MHz 4947.5 – 4982.5 MHz 15 MHz 5 GHz Z8H89FT PMP 450b 0032 Mid-Gain 4950.0 – 4980.0 20 MHz MHz Z8H89FT PMP 450b 0032 Mid-Gain 26 dBm 24 dBm 5155 – 5247.5 MHz 9 dBm 10 MHz 5155 – 5245.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Frequencies Band Bandwidth Maximum Combined Tx Output Power 20 MHz 5482.5 – 5715.0 MHz 8 dBm 30 MHz 5487.5 – 5710 MHz 8 dBm 40 MHz 5495.0 – 5705 MHz 8 dBm Note For 40 MHz, channel center frequencies 5490 and 5492.5 need a power back off of 5 dB. 5.8 GHz 5 MHz 5730.0 – 5845.0 MHz 19 dBm 10 MHz 5730.0 – 5845.0 MHz 19 dBm 15 MHz 5732.5 – 5842.5 MHz 19 dBm 20 MHz 5735.0 – 5840.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Band Bandwidth Frequencies Maximum Combined Tx Output Power 15 MHz 5257.5 – 5337.5 MHz 3 dBm 20 MHz 5260.0 – 5337.5 MHz 3 dBm 30 MHz 5265.0 – 5332.5 MHz 3 dBm 40 MHz 5270.0 – 5330.0 MHz 3 dBm 5 MHz - - 5480.0 – 5720.0 3 dBm 10 MHz 15 MHz 5480.0 – 5717.5 MHz 6 dBm 20 MHz 5482.5 – 5715.0 MHz 6 dBm 30 MHz 5487.5 – 5710.0 MHz 6 dBm 5490.0 – 5705.0 6 dBm 5.4 GHz 40 MHz 5730.0 – 5845.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Band Bandwidth Frequencies Maximum Combined Tx Output Power 40 MHz 5490.0 – 5705 MHz 22 dBm 5 MHz 5730.0 – 5872.5 MHz 22 dBm 5730.0 – 5870.0 22 dBm 10 MHz 15 MHz 5732.5 – 5867.5 MHz 22 dBm 20 MHz 5735.0 – 5865.0 MHz 22 dBm 5740.0 – 5860.0 22 dBm 5.8 GHz 30 MHz 40 MHz (*) MHz MHz 5745.0 – 5855.
Chapter 4: Reference information FCC ID Product FCC specific information Frequency Channel Band Bandwidth Frequencies Maximum Combined Tx Output Power QWP30450M 3.65 GHz PMP 450m 3.65 GHz AP 4.9 GHz 5.1 GHz QWP- 5 GHz PMP 50450M 450m AP 5.2 GHz 5.4 GHz 5.8 GHz 5 MHz 3652.5 -3697.5 MHz 37 dBm 20 MHz 3660.0 – 3690.0 MHz 39 dBm 40 MHz 3670.0 – 3680.0 MHz 43 dBm 5 MHz 4942.5 – 4987.5 MHz 48 dBm 10 MHz 4945.0 – 4985.0 MHz 47 dBm 15 MHz 4952.5 - 4982.
Chapter 4: Reference information FCC specific information FCC approved antenna list The lists of antennas which have been approved for operation by the FCC are provided in: • Table 220 for 4.9 GHz • Table 221 for 5.1 and 5.2 GHz • Table 222 for 5.4 GHz • Table 223 for 5.8 GHz Note Any antenna of the same type and of gain equal or lower than the one approved by the FCC can be used in the countries following the FCC rules. Table 219 USA approved antenna list 4.
Chapter 4: Reference information FCC specific information Table 220 USA approved antenna list 5.1 and 5.2 GHz Directivity Directional Sector Stated Gain Type Manufacturer Reference Integrated flat Cambium N/A 23.0 plate Networks 2ft dual polarised Mars Antennas MA-WA56-DP-28N 28.5 4ft parabolic dual Gabriel PX4F-52-N7A/A 34.5 polarised Antennas Integrated 90° Cambium A005240 16.0 sector flat plate Networks Integrated 90° Cambium N/A 17.
Chapter 4: Reference information FCC specific information Table 221 USA approved antenna list 5.4 GHz Directivity Directional Stated Gain Type Manufacturer Reference Integrated flat Cambium N/A 23.0 plate Networks 2 ft dual polarised Mars Antennas MA-WA56-DP-28N 28.5 MTI MT-486013-NVH 28.5 Integrated 90° Cambium A005240 16.0 sector flat plate Networks Integrated 90° Cambium N/A 17.0 PMP 450i AP Networks 90° sectorised Cambium 85009324001 17.0 85009325001 17.
Chapter 4: Reference information FCC specific information Table 222 USA approved antenna list 5.8 GHz Directivity Directional Sector Stated Gain Type Manufacturer Reference Integrated flat Cambium N/A 23.0 plate Networks 2 ft dual polarised Mars Antennas MA-WA56-DP-28N 28.0 4 ft parabolic dual Gabriel PX4F-52-N7A/A 35.3 polarised Antennas 6 ft Parabolic dual Gabriel PX6F-52/A 38.1 polarised Antennas Integrated 90° Cambium A005240 16.
Chapter 4: Reference information Innovation Science and Economic Development Canada (ISEDC) specific information Innovation Science and Economic Development Canada (ISEDC) specific information 900 MHz ISEDC notification Radio Standards Specification RSS-247, Issue 1, Digital Transmission Systems (DTSs), Frequency Hopping Systems (FHSs) and License-Exempt Local Area Network (LE-LAN) Devices, is a new standard to replace annexes 8 and 9 of RSS-210, Issue 8. 4.
Chapter 4: Reference information Innovation Science and Economic Development Canada (ISEDC) specific information Pour la version du produit avec antenne externe et afin de réduire le risque d'interférence avec d'autres utilisateurs, le type d'antenne et son gain doivent être choisis afin que la puissance isotrope rayonnée équivalente (PIRE) ne soit pas supérieure à celle permise par la règlementation.
Chapter 4: Reference information ISEDC Product Cert. Innovation Science and Economic Development Canada (ISEDC) specific information Frequency Channel Band Bandwidth Frequencies Maximum combined Tx output power 5 MHz 4942.5 – 4987.5 MHz 24 dBm 10 MHz 4945.0 – 4985.0 MHz 24 dBm 15 MHz 4952.5 - 4982.5 MHz 24 dBm 20 MHz 4950.0 – 4980.0 MHz 24 dBm 5 MHz 5252.5 – 5342.5 MHz 11 dBm 10 MHz 5255.0 – 5340.0 MHz 11 dBm 15 MHz 5257.5 – 5337.5 MHz 11 dBm 20 MHz 5260.0 – 5332.
Chapter 4: Reference information ISEDC Product Cert. Innovation Science and Economic Development Canada (ISEDC) specific information Frequency Channel Band Bandwidth 3.65 GHz Frequencies Maximum EIRP 40 MHz 3470.0 – 3630.0 MHz 57 dBm 5 MHz 3652.5 – 3697.5 MHz 57dBm 20 MHz 3660.0 – 3690.0 MHz 57 dBm 40 MHz 3670.0 – 3680.0 MHz 57dBm 5 MHz 4942.5 – 4987.5 MHz 48 dBm 10 MHz 4945.0 – 4985.0 MHz 48 dBm 15 MHz 4952.5 - 4982.5 MHz 48 dBm 20 MHz 4950.0 – 4980.
Chapter 4: Reference information Innovation Science and Economic Development Canada (ISEDC) specific information Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada.
Chapter 4: Reference information Innovation Science and Economic Development Canada (ISEDC) specific information Table 225 Canada approved antenna list 4.9 and 5.8 GHz Antenna type Directional Description Manufacturer Reference Integrated flat Cambium N/A plate Networks 2 ft dual MARS polarised flat Antennas Gain (dBi) 4.9 GHz 5.8 GHz 23 23 28.5 28 N/A 35.3 37.
Chapter 4: Reference information Innovation Science and Economic Development Canada (ISEDC) specific information Table 226 Canada approved antenna list 5.2 and 5.4 GHz Directivity Directional Stated Gain Type Manufacturer Reference Integrated flat Cambium N/A 23.0 plate Networks 2ft dual polarised Mars Antennas MA-WA56-DP-28N 28.5 MTI MT-486013-NVH 28.5 Integrated 90° Cambium A005240 16.0 sector flat plate Networks Integrated 90° Cambium N/A 17.
Chapter 5: Troubleshooting Chapter 5: Troubleshooting This chapter contains procedures for identifying and correcting faults in a 450 Platform Family link. These procedures can be performed either on a newly installed link, or on an operational link if communication is lost, or after a lightning strike.
Chapter 5: Troubleshooting General troubleshooting procedure General troubleshooting procedure General planning for troubleshooting Effective troubleshooting depends in part on measures that you take before you experience trouble in your network. Cambium recommends the following measures for each site: • Identify troubleshooting tools that are available at your site (such as a protocol analyzer). • Identify commands and other sources that can capture baseline data for the site.
Chapter 5: Troubleshooting General troubleshooting procedure General fault isolation process Effective troubleshooting also requires an effective fault isolation methodology that includes the following: • Attempting to isolate the problem to the level of a system, subsystem, or link, such as o AP to SM o AP to CMM4 o AP to GPS o Backhaul (BH) o Backhaul (BH) to CMM4 o Power • Researching Event Logs of the involved equipment • Interpreting messages in the Event Log • Answering the questi
Chapter 5: Troubleshooting General troubleshooting procedure Secondary Steps After preliminary fault isolation is completed through the above steps, follow these: • Check the Canopy knowledge base (http://community.cambiumnetworks.com/) to find whether other network operators have encountered a similar problem. • Proceed to any appropriate set of diagnostic steps.
Chapter 5: Troubleshooting Troubleshooting procedures Troubleshooting procedures Proceed to any appropriate set of diagnostic steps.
Chapter 5: Troubleshooting 4 Troubleshooting procedures On the SM end of the link: • Verify that the PC that is connected to the SM is correctly configured to obtain an IP address through DHCP. 5 • Execute ipconfig (Windows) or ifconfig (linux) • Verify that the PC has an assigned IP address. On each end of the link: • • Access the General tab in the Configuration page of each module. Verify that the setting for Link Speeds (or negotiation) matches that of the other module.
Chapter 5: Troubleshooting Troubleshooting procedures NAT/DHCP-configured SM has lost or does not establish connectivity Before troubleshooting this problem, identify the NAT/DHCP configuration from the following list: • NAT with DHCP Client (DHCP selected as the Connection Type of the WAN interface) and DHCP Server • NAT with DHCP Client (DHCP selected as the Connection Type of the WAN interface) • NAT with DHCP Server • NAT without DHCP To troubleshoot a loss of connectivity for a SM configured
Chapter 5: Troubleshooting Troubleshooting procedures SM Does Not Register to an AP To troubleshoot a SM failing to register to an AP, perform the following steps. Procedure 31 Troubleshooting SM failing to register to an AP 1 Access the Radio tab in the Configuration page of the SM. 2 Note the Color Code of the SM. 3 Access the Radio tab in the Configuration page of the AP. 4 Verify that the Color Code of the AP matches that of the SM. 5 Note the Radio Frequency Carrier of the AP.
Chapter 5: Troubleshooting Troubleshooting procedures Module has lost or does not gain sync To troubleshoot a loss of sync, perform the following steps. Procedure 32 Troubleshooting loss of sync 1 Access the Event Log tab in the Home page of the SM 2 Check for messages with the following format: RcvFrmNum = ExpFrmNum = 3 If these messages are present, check the Event Log tab of another SM that is registered to the same AP for messages of the same type.
Chapter 5: Troubleshooting Troubleshooting procedures Module does not establish Ethernet connectivity To troubleshoot a loss of Ethernet connectivity, perform the following steps: Procedure 33 Troubleshooting loss of Ethernet connectivity 1 Verify that the connector crimps on the Ethernet cable are not loose. 2 Verify that the Ethernet cable is not damaged. 3 If the Ethernet cable connects the module to a network interface card (NIC), verify that the cable is pinned out as a straight-through cable.
Chapter 5: Troubleshooting Troubleshooting procedures CMM4 does not pass proper GPS sync to connected modules If the Event Log tabs in all connected modules contain Loss of GPS Sync Pulse messages, perform the following steps. Procedure 34 Troubleshooting CMM4 not passing sync 1 Verify that the GPS antenna has an unobstructed view of the entire horizon. 2 Verify that the GPS coaxial cable meets specifications. 3 Verify that the GPS sync cable meets specifications for wiring and length.
Chapter 5: Troubleshooting Troubleshooting procedures Module Software Cannot be Upgraded If your attempt to upgrade the software of a module fails, perform the following steps. Procedure 35 Troubleshooting an unsuccessful software upgrade 1 Download the latest issue of the target release and the associated release notes. 2 Verify that the latest version of CNUT is installed. 3 Compare the files used in the failed attempt to the newly downloaded software.
Chapter 5: Troubleshooting Power-up troubleshooting Power-up troubleshooting Module does not power ON Is Module’s power LED ON? Yes A No Is the LED always red? Ethernet cable repaired Yes Yes Is there AC power going to the supply? Test cable, use known good cable.
Chapter 5: Troubleshooting Registration and connectivity troubleshooting Registration and connectivity troubleshooting SM/BMS Registration If no SMs are registered to this AP, then the Session Status tab displays the simple message No sessions. In this case, try the following steps. 1 More finely aim the SM or SMs toward the AP. 2 Recheck the Session Status tab of the AP for the presence of LUIDs.
Chapter 5: Troubleshooting Logs Logs Persistent Logging PMP 450 SM supports logging information such as session logs, authentication logs, and authorization logs that are persistent through reboots and connectivity losses. Navigate to Logs to view: • SM Session • SM Authentication • SM Authorization All the SM logs are saved to flash and displayed upon reboot.
Chapter 5: Troubleshooting Logs Figure 95 SM Authorization log Page 5-16
Chapter 5: Troubleshooting 450m Reference information A.1 Specifications Please see the Specification sheets listed on the Cambium Networks website for the most up-to-date 450m Series AP specifications: http://www.cambiumnetworks.com/resource/pmp-450m/ A.2 450m overload The 450m Series AP is designed to handle high load in terms of high throughput and high PPS. In terms of throughput, 450m is designed to achieve 3x or more throughput improvement over 450 and 450i Series products.
Chapter 5: Troubleshooting 1. Logs high traffic during busy periods: those statistics will be close to 100% and almost all slots will be utilized. In this case if the Overload statistics show that packets are discarded then this is an indication of overload condition. 2. high percentage of VCs with low modulation with moderate traffic. Those VCs will require more slots to service them (due to low modulation) and the frame utilization will be high.
Chapter 5: Troubleshooting Logs Quality of Service (QoS) Glossary Term Definition 10Base-T Technology in Ethernet communications that can deliver 10 Mb of data across 328 feet (100 meters) of CAT 5 cable. 169.254.0.0 Gateway IP address default in Cambium fixed wireless broadband IP network modules. 169.254.1.1 IP address default in Cambium fixed wireless broadband IP network modules. 255.255.0.
Chapter 5: Troubleshooting Logs Term Definition Attenuation Reduction of signal strength caused by the travel from the transmitter to the receiver, and caused by any object between. In the absence of objects between, a signal that has a short wavelength experiences a high degree of attenuation nevertheless. BER Bit Error Rate. The ratio of incorrect data received to correct data received. BHM Backhaul Timing Master (BHM)- a module that is used in a point to point link.
Chapter 5: Troubleshooting Logs Term Definition CMM Cluster Management Module. A module that provides power, GPS timing, and networking connections for an Access Point cluster. CodePoint See DiffServ. Color Code Field Module parameter that identifies the other modules with which communication is allowed. The range of valid values is 0 to 255. Community String Field Control string that allows a network management station to access MIB information about the module.
Chapter 5: Troubleshooting Logs Term Definition DiffServ Differentiated Services, consistent with RFC 2474. A byte in the type of service (TOS) field of packets whose values correlates to the channel on which the packet should be sent. The value is a numeric code point. The PMP 450 AP’s support four levels of QoS.
Chapter 5: Troubleshooting Logs Term Definition ETSI European Telecommunications Standards Institute Fade Margin The difference between strength of the received signal and the strength that the receiver requires for maintaining a reliable link. A higher fade margin is characteristic of a more reliable link. Standard operating margin. FCC Federal Communications Commission of the U.S.A.
Chapter 5: Troubleshooting Logs Term Definition HTTPS Hypertext Transfer Protocol Secure (HTTPS) ICMP Internet Control Message Protocols defined in RFC 792, used to identify Internet Protocol (IP)-level problems and to allow IP links to be tested. See http://www.faqs.org/rfcs/rfc792.html. Integrated The 450 Platform Family Integrated Radio solution provides integrated antenna.. IP Internet Protocol defined in RFC 791. The Network Layer in the TCP/IP protocol stack.
Chapter 5: Troubleshooting Logs Term Definition MAC Address Media Access Control address. The hardware address that the factory assigns to the module for identification in the Data Link layer interface of the Open Systems Interconnection system. This address serves as an electronic serial number. Management Information Space that allows a program (agent) in the network to relay information Base to a network monitor about the status of defined variables (objects).
Chapter 5: Troubleshooting Logs Term Definition Default Mode Device that enables the operator to regain control of a module that has been locked by the No Remote Access feature, the 802.3 Link Disable feature, or a password or IP address that cannot be recalled. This device can be either fabricated on site or ordered. PMP See Point-to-Multipoint Protocol.
Chapter 5: Troubleshooting Logs Term Definition Region Code A parameter that offers multiple fixed selections, each of which automatically implements frequency band range restrictions for the selected region. Units shipped to regions other than the United States must be configured with the corresponding Region Code to comply with local regulatory requirements. RF Radio frequency. How many times each second a cycle in the antenna occurs, from positive to negative and back to positive amplitude.
Chapter 5: Troubleshooting Logs Term Definition Static IP Address Assignment of Internet Protocol address that can be changed only Assignment manually. Thus, static IP address assignment requires more configuration time and consumes more of the available IP addresses than DHCP address assignment does. RFC 2050 provides guidelines for the static allocation of IP addresses. See http://www.faqs.org/rfcs/rfc2050.html. See also DHCP.
Chapter 5: Troubleshooting Logs Term Definition UDP User Datagram Protocol. A set of Network, Transport, and Session Layer protocols that RFC 768 defines. These protocols include checksum and address information but does not retransmit data or process any errors. See http://www.faqs.org/rfcs/rfc768.html. udp User-defined type of port. U-NII Unlicensed National Information Infrastructure radio frequency band, in the 5.1GHz through 5.8 GHz ranges. VID VLAN identifier. See also VLAN.
