New Contributor I 06-09-2011 06:08 PM. Do not use a multicast address (least significant bit of the high megabyte = 1). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Gigabit has much higher power consumption than 10/100 MBps. How to check network adapter speed from Settings To view the connection speed for a Wi-Fi or Ethernet adapter, use these steps: Open Settings. Driver version is 10.3.723.2015. Asking for help, clarification, or responding to other answers. First Time Here? Now, click on Jumbo Frame from the list. 04-09-2019 Share. Thevirtual address doesn't change the burned-in (physical) address on the adapter. Ask the community. However, at home, theresno need to keep them enabled. 2. Tecno Phantom V Fold: Price, Specs & Top Features, Xiaomi 12 Pro 10000 , , 3 key announcements from OnePlus at MWC 2023 including the Concept phone, 5 smartwatches with a round dial that you can buy right now, 5 key features of the LG S95QR soundbar that just launched in India. Tags: envy 23 Give it a few seconds to recompose, then Action, scan for hardware changes. can all strain available resources. This allows it to coexist with older 802.11g radios that do not support 40MHz wide wireless channels. If responses successfully, the jumboframe works. ncdu: What's going on with this second size column? If a third-partyadapter is added to a team, its RSS settings must match the Intel adapters in the team. Auto detect: Automatically set to On or Off depending on speed and adapter type when the driver is installed. You should see this in the "Power Management" tab. The short preamble will yield slightly better performance if the signal is strong and there is no packet loss, however, it needs to be set the same on all devices (routers/access points/repeaters). Open the Control Panel (icons view), and click/tap on the Network and Sharing Center icon to open the Network and Sharing Center. Using Jumbo frames at 10 or 100 Mbps can result in poor performance or loss of link. I am trying to get the best possible setting for my Realtek PCI-e GBE family controller network card so that when it will be literally minimal or zero lag when playing online game. // Performance varies by use, configuration and other factors. WMM Power Save / U-APSD: WMM-PS allows for power saving with latency-sensitive applications like VoIP. Performance options - Interrupt moderation rate. Learn more about Stack Overflow the company, and our products. Full list of the top Drivers apps that are similar to Realtek High Definition Audio, including Bluetooth Driver Ver.5..1.1500.zip, Bluetooth Driver 5..1.1400.zip, Intel(R) High Definition Audio . If RSS is not enabled for all adapters in a team, RSS is disabled for the team. Archived. Wider channels may be needed for higher throughput. 1. Inventors: Schneider, Reinhold (Veitsbronn, DE) A lower rate causes the system to be more responsive to packet handling, but can decrease performance of other applications and services on the machine. Aims to improve Wi-Fi network efficiency and boost throughput by repackaging data to reduce overhead. 5,127 Views Mark as New; LTR Enable/Disable, LTR Active Value: (default = 60 microseconds) Latency Tolerance Reporting (LTR) is a PCI Express power-saving technique allowing the the adapter to specify when it is idle, and maximum latency. It should only be enabled if needed for power saving or VoIP. We recommend disabling this setting. Sign in here. Since your DNS server is responsible for resolving website URLs, its speed can be the defining point. TCP/IP offloading options - Offload transmit IP checksum. If the CPU utilisation is high, then you should stick to two queues. By using this site, you accept the. LINK_DOWN_CHANGE When this message is displayed, the link is down. // See our complete legal Notices and Disclaimers. It designed for better CPU utilization. Priority & VLAN: By default, packets are send using FiFo (First-in, First-out) regardless of any priority information in the packet. It is out of ethernet specific and has ethernet switch/hub compatibility. Despite reading all about the problem, changing and resetting multiple setting nothing worked. MIMO Power Save mode: a.k.a. Off The adapter cannot send or receive flow control frames. The IPsec connection to the secure gateway is down. Within seconds, I'll hear the corresponding tone for inserting a device, then the Ethernet connection works once again. Log Link State Event: This allows you to enable or disable logging of the adapters link state changes (such as up/down, duplex mismatch, and STP detection) in the system logs. I have 1gHz service and the maximum upload I get is 120mb with the onboard realtek rtl8821ce 802.11ac pcie adapter. I use the Anker PowerExpand 8-in-1 USB-C PD Media Hub. It prioritizes data packets according to four categories (voice, video, best effort, background) and also features a power save mode. To investigate theissue, click the Link Speed tab and run diagnostics. Squirrels and rain can slow down an ADSL modem Telefonica Incompetence, Xenophobia or Fraud? Is there "channel options" I can select via the properties for the Realtek RTl8821ce 802.11ac PCIE adapter? Long Preamble is needed for older 802.11b/g adapters, for weaker signals (lower RSSI), while strong signals and 802.11n/ac devices generally work well with short preamble. We would recommend you to set the highest possible speed in the full duplex mode. Association Roam Preference: When a specific band is preferred (2.4GHz or 5GHz), and the client encounters a dual AP with the same SSID for both bands, this setting chooses which band to use. Some adapters might support RSS queue settings. Optimal advanced settings for Gigabit NIC, 1Gbps Full Duplex has 100x slower upload than 100Mbps Full Duplex, UDP RSS not working on Windows 10 with Intel NIC X550-T2. In response to idata. Channel Width: Controls the width of the channel (20 or 40MHz) used by the AP to communicate with client devices. When configuring Jumbo frames on a switch, set the frame size 4 bytes higher for CRC, plus 4 bytes if using VLANs or QoS packet tagging. Do you have a tip that we missed out? OS offloads IPv4 UDP checksum calculation to hardware. You can easily search the entire Intel.com site in several ways. When users change the setting to Enabled in battery mode and the network cable is unplugged, the driver will automatically disable PCIe mechanism. Copyright 2007-23 9.9 Group Pvt.Ltd.All Rights Reserved. Enables the adapter to verify the TCP checksum on received packets and compute checksum on transmitted packets. Flow control could stop TX side sending to prevent lost packets. Every 1 to 2 hours my Ethernet link is down. The opinions expressed above are the personal opinions of the authors, not of HP. This setting has no effect if your system has only one processing unit. Throughput Booster/Enhancement: Enhance the transmit throughput by allowing the client Wi-Fi adapter to hold longer possession of the connection than normally to send data to the AP. Intels products and software are intended only to be used in applications that do not cause or contribute to a violation of an internationally recognized human right. This feature can improve IP transmit performance and reduce CPU utilization. 1gLinks are 1 Gbps. It should be disabled for gaming, and set at a very conservative setting for pure throughput unless you are aiming for low CPU utilization at the expense of some possible delay. To investigate the issue, click the Link Speed tab and run diagnostics. 09:59 AM By default it automatically switches between long and short depending on the situation the card is in. My 8821CE is using the default advanced settings. Your performance goals for the server. It is a power-saving technique where the adapter signals an interval to the access point. On the other hand, if you think you've broken something, the fix is as simple as resetting your network adapter. // Intel is committed to respecting human rights and avoiding complicity in human rights abuses. You can configure Large Send Offload separately for IPv4 and IPv6. Per another post, tried Energy-Efficient Ethernet and sent Speed/Duplex to 1gig full duplex so Auto Negotiation is switched off (I have gig service). Within the Windows "Device Manager", open the "Network" section, and double-click on the adapter, and switch to its "Properties" tab. This feature is for better CPU utilization balance while internet browsing and file copying. ), Network adapter settings can be adjusted from Control Panel -> Network and Internet -> Network and Sharing Center -> Change adapter settings -> right-click on your network adapter and choose "Properties" -> click the "Configure" button, Alternatively, right-click on the Network adapter icon in the system tray and open Network and Sharing Center -> click "Change adapter settings" in the left pane -> right-click on your network adapter and choose "Properties" -> click the "Configure" button. Flow control does not work well with QoS, and is generally not recommended. Other ideas? At Digit it is our goal to help Indian technology users decide what tech products they should buy. This is where we get into the advanced techniques to optimise your network. RTL8156 / RTL8156B (S) (G) Network Interface Controllers > 10/100/1000M Gigabit Ethernet > USB 3.0. Using jumbo frames can help increase throughput and decrease CPU utilization on Gigabit LANs, however, the functionality and the same frame size needs to be supported by all devices on the network. It is only useful for mixed 802.11b/g/n networks, disable for n/ac networks. The recommended size is either 512 or maybe even 1024 - you can go up to 2048 if you have enough RAM to support it. If you discover lots of retransmissions from a particular client, your monitoring analysis might indicate that the particular client should be set back to one of the adaptive rates at all times -. This could improve transfer speed and reduce CPU utilization. QoS packet tagging or Priority & VLAN, Enables sending and receiving of IEEE 802.3ac tagged frames, which include, 802.1p QoS (Quality of Service) tags for priority-tagged packets. Compensates for excessive Ethernet packet collisions by controlling back-to-back timing. The following sections describe some of your performance tuning options. Roaming Decision: Specifies the signal strength when other access points in the area should be considered for connections. It has been a while since anyone has replied. iQOO Neo 7 Review:Most powerful mid-ranger? By using this site, you accept the. Change the MAC address of network card. A. Unfortunately, price of network cables does not directly correlate to price, you may have better luck buying cables from a reputable vendor that uses quality components and actually tests each assembled cable properly. This feature is used to establish a connection between two or more Windows operating systems. Network Interface Controllers > 2.5G Gigabit Ethernet > USB 3.0. Typically, the default value is 2347 bytes and should be left alone, unless there is a high number of collisions and/or interference. Those TCP connections will dispatch to different CPUs. It has a RealTek USB GbE Family Controller (per the driver name in Device Manager). Increasing the number of Transmit Descriptors can enhance transmit performance. IPv4/TCP/UDP Checksum Offload: Enables the adapter to compute the IPv4/TCP/UDP checksum of packets instead of the OS, which reduces CPU utilization, and may theoretically increase adapter performance. This is a newer specification than Large Send Offload (IPv4). If both ends are multi-port devices, the one with higher seed bits becomes the master. https://www.dell.com/community/XPS/XPS-13-9300-2020-drops-ethernet/td-p/7685183reports of a similar problem with the 9300. Didn't find what you were looking for? Afterburner: Proprietary Broadcom throughput boosting technique used with 802.11g only, must also be supported by the access point. Gigabyte G5 KE Review:A budget RTX 3060 gaming laptop offering. If youre using a single PC setup at home and you arent going to connect any other Windows machine to the network, then you dont need the first two options under Networking in Ethernet Properties. Interrupt Moderation Rate (coalescing): Sets the rate at which an adapter interrupts the system to handle incoming or outgoing packets. Intel PROSet for Windows* Device Manager is a selectable component when you install generic driver and software packages from the Download Center. Dell XPS 13 Plus Review:Where are all the IO options? Do note, sometimes the router might override the DNS server, so it would be useless to implement on the PC. Minimum Power Consumption: when enabled, the client can turn off the radio or stop scanning for networks when the adapter is not associated with an access point, or when the computer is in idle state. To learn more, see our tips on writing great answers. Speed tests before the upgrade to 1ghz was the same. Speed and Duplex: Just as the name suggests, this allows for selecting the desired speed and duplex of the network adapter, the default setting is usually auto negotiation. Cheers,-- miles. No disconnect issues anymore! When the network connection drops, I hear the sound that indicates a device was removed. GTK rekeying for WoWLAN: Group Temporal Key (GTK) rekey is used to encrypt/decrypt network traffic Enabled by default. Before heading over to the tips, if youre unaware where the menu is present, go to Settings in Windows 10 and open Network & Internet. 7. This feature could not increase total throughput. Check documents on compatibility, FAQs, upgrade information and available fixes. What speed were you getting before you upgraded? 2) Ensure to choose View by Large icons or View by Small icons, and click Troubleshooting. When youre sending and receiving packets, theres a buffer of the system memory that is used by the adapter. If my adapter has an 'Interrupt Moderation Rate' and an 'Interrupt Moderation' setting, should both be set to Off? Only lower in areas with significant interference. Copyright 1999-2023 Speed Guide, Inc. All rights reserved. It may reduce throughput in some cases. If transmit performance is not an issue, use the default setting. Also you can enter in the properties of your network card Properties and click on Configurethere on the advanced tabmake sure that Speed and Duplex is set to 1Gbps full duplex. I called my ISP tech support. Thanks for contributing an answer to Super User! The Realtek USB GbE Family Controller will appear again. By signing in, you agree to our Terms of Service. Who requires to use this feature? You can also try the quick links below to see results for most popular searches. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Click Network and Internet. When I view the properties of my wirelessrealtek rtl8821ce 802.11ac pcie adapter, link speed is 150/150 receive/transmit. RSS is disabled. Brand new XPS13 9310. To add these DNS server addresses, head over to the network adapter properties. You can choose the speed of your network adapter along with the communication type. The internet speed tested speed you see is not caused by the Realtek cardbut the Router you are connected to see how big is the NAT speed of the router you have! Antenna Diversity: wireless technique that uses multiple antennas to receive or transmit signals along different propagation paths to compensate for multi-path interference. Besides the speed, thereare a few other options: Full duplex (two-way simultaneous communication) or half-duplex (one-way communication). Intel adapter drivers usually have this setting under the network adapter properties -> Advanced -> Performance Options: "Receive Buffers" and "Transmit Buffers". QoS Packet Tagging: Enables the adapter to send and receive 802.1p QoS and 802.1Q VLAN indications. The interrupts are automatically trigger in a period. Some devices include the header information in the frame size while others do not. Q. Green Ethernet (Short Reach Mode): Reduces the adapters power consumption if the connected cable is detected under a certain length. We recommend disabling this to get gigabit speeds. Also if provider guarantees that you will have 500Mbps speed.otherwise its Network dependentI mean the more people use the connection in the same timethe lower the speed you will getdo try to test the speed in different time of dayto see if any changes! Looks like this driver fixed the problem completely! I am even running Windows 10 21H1. TCP/IP offloading options - TCP checksum offload. To Check Network Adapter Speed in Network and Sharing Center. Try to uninstall the driver from device managerand let it reinstall by itselfI always use the latest drivers from Realtek website.Your driver version should be 10.32. Is it possible to increase the speed of my Realtek PCIe GBE Is it possible to increase the speed of my Realtek PCIe GBE Family Controller on my old ENVY 23? Elecom U3HC-A423P5BK. Here, youre allowed to change the maximum number of RSS queues as listed under Maximum Number of RSS Queues. Click on Ethernet on the left column and then go to Change adapter options on the right panel. This reduces CPU utilization and improve throughput. Of course, this will be bundled with a lower machine performance. Adaptive (ITR = -1, no interrupts/sec, it is dynamically changed by the driver). Recommended: Disabled unless on battery. (external), Network adapter MAC/OUI/Brand affect latency, Road Runner Security - File and Print Sharing. Disable Large Send Offload (IPv4), Large Send Offload V2 (IPv4), Large Send Offload V2 (IPv6) and all the checksum offloads including IPv4/TCP/UDP. These wont be the same for everyone since its dependent on the network adapter. Ask the community. Of course, replacement of your WiFi adapter is possible. disabled Green ethernet -> disabled Speed & duplex -> auto negotiation My Windows log does not see some errors when it dropps, only my vpn client : The network interface for the VPN connection has gone down. We are about leadership the 9.9 kind Building a leading media company out of India. Mutually exclusive execution using std::atomic? Jumbo Frames: This allows for increasing the standard 1500-byte MTU Ethernet frames to carry up to 9000 bytes of data. RSS balances receive traffic across multiple CPUs or CPU cores. This can be increased to help improve performance of network traffic, at the expense of some system memory. If this is disabled, the burden of processing the receive data will fall on a single core and go on to affect system cache utilisation. First Time Here? Rate: This setting can limit the wireless transmit/receive rate of the network adapter, it should be left at auto in most cases. Fat Channel Intolerant: 802.11n setting, recommended "Disabled" for pure throughput. These buffers can be increased to improve network performance if there is plenty of memory available. Some of the advanced network adapter settings above can vary between different models and drivers, and typically not all of them will be available. Disabling Flow Control might help with the increase in the efficiency of traffic regulation for connections. Pick the highest speed and favourable duplex. Enables or disables Jumbo frame capability. Enables the adapter to offload the task of segmenting TCP messages into valid Ethernet frames. Netgear AC1200 claims 10/100/1000 Mbps - Gigabit ethernet ports, but when I log into it, it only shows 100M/Full status for all four of the LAN ports. Depending on your network adapter, you might additionally get the option to change the interrupt moderation rate instead of only enabling or disabling it. However, some offloads (TCP Offloads, LSO Offloads) can can also add some latency to the connection, and introduce issues. Default is usually between 128 and 256 for both, it can be increased to 512, or even up to 1024 on systems with plenty of RAM to spare. It seems to happen most when the laptop is not doing anything, like when I am reading a long article. In general, "Energy Efficient Ethernet (EEE)", "Green Ethernet" and "Power Saving Mode" settings allow for lower power consumption during periods of low network activity, with the goal to reduce power consumption by 50% or more while retaining full compatibility with existing equipment. Gigabit Master Slave Mode: Determines whether the adapter or the link partner is designated as the master; the other end of the link would be the slave. What is Auto Disable PHY? This recommendation is true for both gaming/latency and pure throughput optimizations. Connect and share knowledge within a single location that is structured and easy to search. These other services can usually be safely disabled without affecting connectivity:- QoS Packet Scheduler - Quality of Service packet scheduler designed to control and prioritize IP traffic for various network services as a method of bandwidth management.- Microsoft Network Adapter Multiplexor Protocol - kernel mode driver used for network card bonding.- Microsoft LLDP Protocol Driver - Link Layer Discovery Protocol (LLDP) is a protocol for network devices to advertise their identity and neighbors, used for a network map.- Link-Layer Topology Discovery Responder - kernel mode driver responsible for displaying the computer on a network map.- Link-Layer Topology Discovery Mapper I/O Driver - used to discover other networked devices on a network map, and determine network bandwidth.- Internet Protocol version 6 (TCP/IPv6) - latest revision of the Internet Protocol (IP), extending the v4 IP address limitation. Press Windows + R, type ncpa.cpl in Run dialog. While a basic off-brand NIC may suffice for casual use on a home computer, any tech-savvy power user, if you use P2P appliactions, media streaming, gaming, or running any type of server, you should opt for a good brand NIC for better reliability and performance under load. You can check the actual connection speed by going to the Windows control panel>Network and Internet>Network and Sharing Center. The data link is transitioned to an active state operational at the second link speed to transmit the second data to the processor over the data link. Well be taking a look at the most important ones. Enabling this feature can improve IP performance and reduce CPU utilization. Q. WMM / WME: Wi-Fi Multimedia (WMM), previously known as Wireless Multimedia Extensions (WME) is a wireless quality of service (QoS) standard subset of 802.11e. This feature is for power consumption. For these adapters VMQ takes precedence over RSS. Ping a large packet to the other machine. Mine shows 433.3 MBPS. See, RE: Interrupt Moderation - According to an, Optimal setting for advanced parameters for Realtek PCI-e GBE family network card, old.reddit.com/r/gigabyte/comments/j0r0r1/, http://dox.ipxe.org/realtek_8h_source.html, How Intuit democratizes AI development across teams through reusability. So.I don't know what to tell you. Can you exchange your current modem with one that does? Check all latest drivers update et BIOS for this laptop. It would be best to choose two queues that will ensure good throughput and low CPU utilisation. When this is set at the default (usually "Auto Detect", or "Hardware Default"), the devices automatically negotiate this based on the IEEE 802.3ab standard: multi-port devices such as switches become the master when connected to a single port device. 3) In the pop-up "Local Area Connection Properties" dialogue box, only retain the "Client for Microsoft Networks . Decides if the driver waits for Auto Negotiation to be successful before reporting the link state. https://dl.dell.com/FOLDER07011862M/1/XPS_13_9310_2.0.0.exe, Anker PowerExpand 8-in-1 USB-C PD Media Hub, https://www.dell.com/community/XPS/XPS-13-9300-2020-drops-ethernet/td-p/7685183. Enables Receive Side Scaling (RSS). Most advanced configuration settings and definitions are described in the table below. Consumer Ethernet switches that support EEE automatically adjust their respective power-saving settings to match the adapters, but some switches are known not to perform this properly, resulting in poor throughput and increase in dropped packets. To investigate this issue, click the Link Speed tab and change the speed and duplex settings appropriately. Still happens. For example, in the address 0Y123456789A, Y cannot be an odd number. CAT-6 vs. CAT-5) should be preferred, especially in Gigabit environments. ), one can reduce interference by preferring the 5GHz band over the 2.4GHz band, or the reverse. When this feature is enabled, the network adapter dynamically adapts to network traffic conditions. Enables the logging of the following link state changes to the system event log. Open Device Manager by clicking the Start button, clicking Control Panel, clicking System and Maintenance, and then clicking Device Manager. Intel PROSet for WindowsDevice Manager includes an Advanced tab with Settings options and definitions: If a configuration setting is not displayed, it's not available for your device or for your Windows* version. Aggregated Ethernet links on T Series, MX Series, PTX Series routers, and QFX5100, QFX10002, QFX10008, and QFX10016 switches can be configured to operate at one of the following speeds: 100gLinks are 100 Gbps. Your account also allows you to connect with HP support faster, access a personal dashboard to manage all of your devices in one place, view warranty information, case status and more. 03:30 PM Realtek USB FE / GBE / 2.5G / Gaming Ethernet Family Controller Software. Use latest adapter drivers - Using the latest drivers from your NIC vendor can solve any issues with buggy driver support for advanced NIC functions. It is recommended to set the highest speed your adapter supports (Gigabit, if supported), full duplex (two-way simultaneous communication), and auto-negotiation (enabling the adapter to negotiate the highest possible reliable speed). The linking time about 5 seconds. OS offloads IPv4 TCP checksum calculation to hardware. Inrare situations, youget better performance by changing this setting. This results in poor system performance. Many settings depend upon your particular network and usage. In the metrics given for the software, it was claimed that with a concurrent download in place, whereas a base system would only offer a 320x180 Skype video call with 14% lost data packets, with. Wake on Magic Packet: Enables you to remotely power on the computer from sleep, hibernation, or when fully powered off by using the magic packet of the Wake-On-LAN feature. OS offloads large TCP/IPv4 segmentation to hardware. This is especially good for complex homepage content with a lot of pictures. Your account also allows you to connect with HP support faster, access a personal dashboard to manage all of your devices in one place, view warranty information, case status and more. Also see: What is Xpress Technology. Is a PhD visitor considered as a visiting scholar? I have two notebooks with those model wifi card installed. Offload TCP Segmentation: Allows the adapter to perform any necessary TCP segmentation of outgoing packets instead of the host OS, which can help increase transmission performance while also reducing CPU utilization. The issue can also occur in a Forced Slave to Forced Slave mode. Offload all processing to the network adapter, If you've executed these tips properly, and made sure that the features are supported by your hardware, your network experience should have improved by a bit. Changing this setting can improve network performance on certain network and system configurations. Disabling all TCP offloading settings will improve the throughput and free up the processor for other tasks. Theres also the third option called auto-negotiation which gives the adapter the liberty to choose the highest speed and this will usually be set as default. 0 Kudos Copy link. 2000$ and the same problem with my newly unboxed Dell XPS 13 9310. So I decided just to live with the problem. Other ideas? A place where magic is studied and practiced? Global BG scan blocking: By default, the Wi-Fi adapter performs periodic scan for other available Access Points. 10gLinks are 10 Gbps. This demands a fast and efficient network adapter, otherwise, it wont work the way it is intended to. @obewon2000--Upgraded my home internet to 1Gig from 500/500. To investigate this issue, click the Link Speed tab and change the speed and duplex settings appropriately. Transmit Buffer size should be twice that of Receive Buffer. Learn How to Post and More, Printing Errors or Lights & Stuck Print Jobs, DesignJet, Large Format Printers & Digital Press, Business PCs, Workstations and Point of Sale Systems, Simply ask a new question if you would like to start the discussion again. All your network adapters will be listed here. Enables adapters to generate or respond to flow control frames, which help regulate network traffic. // Your costs and results may vary. On clicking, it will take you to a new window with more functions. OS offloads IPv4 checksum calculation to hardware. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post". Wake-On-LAN and Shutdown Link speed: Specifies the link speed of the adapter when the computer is in sleep or hibernation. Fragmentation Threshold: Specifies the maximum number of bytes a packet can contain before it is fragmented. Gigabit Lite: This is a legacy setting developed by Alcatel in 1998, generally supported by Realtek adapters. Do new devs get fired if they can't solve a certain bug? The default setting is optimized for common configurations. These frames are sent by an adapter when their receive queues reach a predefined limit, to signal the sending station to pause transmission so the adapter does not drop the packets. Some multi-port devices can be forced to master mode. PLCP Header (BSS PLCP Header): Used to set the header type for CCK (Complimentary Code Keying) rates (long, or auto short/long), only relevant for 802.11b.