uint8_t m_supportedChannelWidth supported channel width uint8_t m_txMaxNSpatialStreams transmit maximum number spatial streams uint8_t m_txMcsSetDefined transmit MCS set defined uint8_t m_txNdpCapableGo to SonicPoints and press configure button on the right hand side, next to the desired SonicPoint. TX PowerSystems, methods, and other embodiments associated with a single stream wireless communication with a greenfield preamble that uses a short guard interval are described. basically you can do with most of the settings or look in the help menu on the right side of DDWRT GUI. For indoor with lot of multi path,its best practice to use long guard interval, as there will be higher possibility of interference from reflections with having it as short. 11 requires a guard interval that makes it so transmissions do not interfere with one another. Select to enable the short guard interval for 802. Command History. IEEE 802. Determine whether the OFDM symbols adopt the short guard interval which is 400ns. 25 KHz for 802. 4 GHz (Radio 1) 5GHz:For this IIR channel, a joint design for precoding, power gain control and equalization of cooperative OFDM relay systems is presented. 11n you can choose between a short guard interval and a long guard interval. Enabling the Short Guard Interval increases the Data Rate. Enabling a short guard interval can decrease network overhead by reducing unnecessary idle time on each AP. The. Enable or disable use of short (400ns) guard interval in 20 MHz mode. Lihat juga 802. If I fix the capability to 20MHz channel width with long guard interval, I still see some (around 10%) of the packets wtih 40MHz channel width and/or short guard interval. client-monitor policy default_Policy problem-type networking trigger-times 3 report-interval 3600. Use the VLAN pool when available. These data rates, which are calculated for a 20-MHz channel width using a short guard interval, are available: 0 (7 Mbps) 1 (14 Mbps) 2 (21 Mbps) 3 (29 Mbps) 4 (43 Mbps)If a "short guard interval" isn't working (channel congestion is a common reason for this), the radios may fall back to a standard guard interval, which will reduce throughput as well. In one embodiment, the short guard interval can reduce overhead associated with the. 64-QAM. On a wireless router, what is AP isolation?Short GI. At runtime, the calling function validates object settings for properties. Data frames will be divided into several symbols when being transmitted. The first 8 modes correspond to short guard interval disabled and channel bonding disabled. Select the channel or channels to include. Some outdoor deployments, may, however require a longer guard interval. This is optimistic, because as we discussed, environmental radio properties affect data rates making it unlikely that a client will ever be able to receive such a high. 4 GHz Spectrum Capabilities 20 MHz Channel Width in 2. Configure Multi-SSID 5. When turned OFF, the Guard Interval is 800ns. Learn how to create a FortiAP profile for your FortiWiFi and FortiAP devices using the latest configuration guide for version 7. 8 µs 0. The shorter guard interval results in a. 11a. 電気通信 において、 ガードインターバル （ 英: Guard interval 、GI、ガード区間とも）とは別個の伝送データが前後の時間のデータとお互いに干渉しないことを目的とするために用いる、符号長の付加時間 [注 1] 。. TX PowerWLAN知识点——GI（Guard Interval）. ShortGuardEnabled: Whether or not short guard interval is enabled for HT/VHT transmissions. The shortest interval (1/32) provides the lowest protection and the highest data rate; the longest interval (1/4) provides the highest protection but the. 11a/b/g used a mandatory 800ns guard interval. The higher the MCS index is, the more throughput is supported by the corresponding modulation schema. This parameter is enabled by default. Short Guard Interval. Reducing the guard interval can yield a 10% improvement in data throughput. Channel Select the channel or channels to include. 8us (0. 2 microseconds of data. 2 ∕ 3. Channel bonding, Short-guard interval (SGI), Frame aggrega-tion, Block Acknowledgement, TCP/UDP Throughput. The Enable Short Guard Interval and Enable aggregation options can slightly improve throughput. "any" will use either short or long, depending on data rate, "long" will use long only. 11n/ac/ax/be Demod Properties > Format tab The Guard Interval is the ratio of the Cyclic Prefix "CP" time to the inverse FFTtime "T (IFFT). In the screen shot above you will notice that Short Guard Interval and Aggregation are both disabled. Dengan Short GI (SGI) ini maka throuput bisa dinaikkan 2x lipat dibandingkan dengan. Compact, cost-effective access points that work from anywhere. In 802. Determine whether the OFDM symbols adopt the short guard interval which is 400ns. SU/MU[0] Coding — A bit field that indicates if convolutional or LDPC coding is used for a single user or for user MU[0] in a multiuser scenario. ssid AeroHive-guest security-object AeroHive-guest. On the other hand. 4 GHz. The. with a short guard interval) will be able to achieve almost 3. Deployments in the last couple of years are more likely to enable a short. option-disable . Description. 11 {a | b} 11nsupport rifs rx {enable | disable} Save your changes by entering this command: save config Ensure to keep at least 6 dB lower value on 2. HA heartbeat packets consume more bandwidth if the hb-interval is short. r/HomeNetworking. According to one embodiment, a wireless communication device includes a receiver configured to receive an orthogonal frequency-division multiplexing (OFDM) signal. The regular guard interval is 800ns. RE: Short Guard Interval -. The guard. The following example shows how to configure a long guard interval: (Cisco Controller) >config 802. Observing the received pilot symbol on p-th sub-carrier and on i-th OFDM symbol. IGMP snooping allows. The standard guard interval used in 802. An AP identifies any signal content. 8µs or Short Guard Interval (SGI) 0. The 802. 802. • Part of Mixed mode frame format. Interval. Shows high-throughput rate information for a Basic Service Set (BSS). 1. 1. The 802. 3. The short or long Guard Interval (GI) will also add around a 10% modification to this. 1 (866) 365-9918. To increase data rate, 802. Caranya sangat mudah, cukup dengan membuka browser yang biasa kamu gunakan lalu memasukkan IP Adress modem. Ideally, the guard interval is set to just above the delay spread of the channel. 11n/g/b, and 5GHz 802. Does anyone know where you can configure short/long Guard Interval (SGI / LGI) on SmartZone controlled APs? I have an outdoor deployment I think may be suffering from some ISI which I'd like to configure to LGI to see if that helps with data rate stability. Enable or disable use of short (400ns) guard interval in 20 MHz mode. 02 lb (0. In networks that experience less than optimum conditions (interference, weak signals, etc. 1 is configured to cause the signal processor 130 to process a first guard interval in the data segment 240 of the single stream communication 210 as a long guard interval and subsequent guard intervals based on an indicated type in the SIG field 230 (e. MU-MIMO is short for Multi-User, Multiple-Input, Multiple-Output. Protect Interval: Short: Security Settings: WPA2-PSK/WPA2-Enterprise: WPA Encryption: AES: WIFI 5G. 38 inches (86 x 86 x 35 mm) Weight 1. Learn how to create a FortiAP profile for your FortiWiFi and FortiAP devices using the latest configuration guide for version 7. Version:V200R019C00. 11a/g 所做的改进。 射频芯片在使用 OFDM 调制方式发送数据时，整个帧是被划分成不同的数据块进行发送的，为了数据传输的可靠性，数据块之间会有 GI ，用以保证接收侧能够正确的解析出各个数据块。 A shorter guard interval results in a shorter symbol time, which increases the data rates by about 10% and increase throughput greatly. The intention of PHY submission was to make short GI a mandatory feature in addition to normal guard interval. 4 HT-LTF HT long training field To estimate MIMO channel 4 HT-Data HT data field Carries MAC layer. 11n-2. Note: The Linksys USB600N does not reliably collect 11n packets with short guard interval. 11n only, you may. 11ax introduces new guard interval options. Short Guard Interval Yes WME Multimedia Extensions Yes FORTIAP C23JD Dimensions Length x Width x Height 3. Tx STBC (1 bit) This field is set to 1 to indicate that transmission of STBC-coded frames is. This parameter is only valuable for 802. Short Guard Interval. Ideally, the guard interval is set to just above the delay spread of the channel. Command Information. The shortest interval (1/32) provides the lowest protection and the highest data rate; the longest interval (1/4) provides the highest protection but the lowest data rate. A number of vendors in both the consumer and enterprise spaces have built products that have achieved this certification. 11n and the next 802. . Under Authentication Type choose WPA2-PSK, Cipher type AES. Different Guard Interval Techniques for OFDM: Performance Comparison 3 Figure 2. Some outdoor deployments, may, however require a longer guard interval. However for office environments, having a Short Guard Interval (SGI), which lowers the interval to 400ns, can give you an increased data rate of 11%. Related Commands. However, enabling this parameter can also have a negative impact. Короткий защитный интервал SGI (Short Guard Interval) определяет интервал времени между передаваемыми символами (наименьшая единица данных, передаваемых за один раз). 11n. Set with class: BooleanValue Underlying type: bool802. As mentioned 11ac products are available in 5GHz frequency band only and not available for 2. The guard interval is the amount of time that the WAP waits between transmissions, which prevents interference. 8- Short Guard Interval: این گزینه باید حتما تیک زده شود و یا فعال شود ( با فعال کردن این گزینه پهنای باند شبکه وایرلس به طور متعادل در فضا پخش میشود و تمام قدرت روی کیفیت و تبادل اطلاعات متمرکز میشود ). Enable/disable spectrum analysis to find interference that would negatively impact wireless performance. +/- 45° Azimuth Scan. For example, wlanVHTConfig('GuardInterval','Short') specifies a 400-nanosecond guard interval (cyclic prefix) duration. Picked this up for $60. • DTIM Interval: The Delivery Traffic Information Map (DTIM) message is an element that is included in some beacon frames. 11b preamble short (Cisco Controller) > (reset system with save). If the short guard interval does not allow enough time for reflections to settle in your mesh deployment, inter-symbol interference values may increase and degrade. Most reflections are received quickly. These longer guard intervals help to prevent inter-symbol interference in outdoor environments and therefore improve coverage and performance. The purpose of a guard interval is to. Multi-user: indicates the coding for user 0. This interval helps data reception avoid delays due to Inter-Symbol Interference (ISI) and overcome echoes (reflection of sound waves). Fri, Nov 24, 2023, 8:06 PM EST · 2 min read. Step 1: Choose Wireless > 802. Short Guard interval & Aggregation. Al habilitar el Short Guard Interval, el Tiempo de Guarda se reduce a la mitad: 400 nanosegundos, con lo que la protección contra reflexiones se. The method for switching from a long guard interval to a short guard interval in accordance with one embodiment of the present invention comprises the steps of: receiving a preamble to generate a channel estimation parameter; calculating a cross-correlation of channels between adjacent subcarriers in accordance with the channel estimation. 11ac or 802. For example, in DVB-T, guard intervals are available as 1/32, 1/16, 1/8 or 1/4 of a symbol period. The short guard interval time is 400ns, or half of what it used to be. The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth. Software-configurable dual radio supports 5 GHz (Radio 0) and 2. 2. . The AP 3500 supported up to 300 Mbps (MCS rate 15) configured with a bonded channel and short guard interval (GI). Anonymous. 11b 11nSupport guard_interval ? any Enable 802. 2 of 4 μ s carry actual data, therefore data rate per subcarrier is 312. The short guard interval is enabled for the highest enabled MCS data rate. 802. 例えば電気信号を無線通信など空間を伝搬さ. Announcement. 11n/ac/ax STAs and APs. 11 OFDM-based communications, Guard Interval is used to ensure that distinct. 11 requires a guard interval that makes it so transmissions do not interfere with one another. Select to enable the short guard interval. You’d be missing a valuable opportunity to improve your network’s performance right from the get-go. According to one embodiment, a wireless communication device includes a receiver configured to receive an orthogonal frequency-division multiplexing (OFDM) signal. Number of extension spatial streams: only 0 is supported. There was no config for only short guard interval as it can cause problems for some clients which don't support it. Guard interval duration 0. GI (Guard Interval) is intended to solve the problem based on delays, and Short GI is used to improve the throughput of the wireless network based on the GI in the environment with small delays. Short Guard. With 802. string. ArubaOS 8. The short guard interval time is 400ns, or half of what it used to be. 11 operation is 800 ns. 4 GHz 5 GHz Spectrum Capabilities 20 MHz Channel Width in 5 GHz 40 MHz Channel Width in 5 GHz 80 MHz Channel Width in 5 GHz Protected Management Frames WMM® WPA2™. Guard Interval (GI) คือ ช่องว่างระหว่าง Channel เว้นไว้เพื่อไม่ให้คลื่นซ้อนทับการ โดยความเข้าใจปกติเราจะคิดว่าคลื่นถ้าส่งด้วยความถี่. A guard interval is a period of time between transmissions that allows reflections from the previous data transmission to settle before an AP transmits data again. Optionally, enable automatic adjustment of transmit power, then specify the minimum and maximum power levels, dBm. Developed & Tested by Core Athletes. If you use 40 MHz channel the max data rate will be 270 Mbps and 300 Mbps for long and short guard interval respectively. 11 11nsupport guard. 11ax introduces new guard interval options. Short guard interval is a standard that is supported by the AP225. B QUESTION: 28 You are reconfiguring an AP to use the short guard interval. AP type: Indoor Hardened, Wi-Fi 6 dual radio, 5 GHz 4x4 MIMO and 2. Short Guard interval (400ns) - optional (though optional but is widely supported) LDPC (Low density parity check code) - optional STBC (Space time block coding) - optional TxBF (transmit beamforming) - optional Support for MCS 8 and 9 (256 QAM) - optional Guard Interval: it is the space between symbols being transmitted. It’s generally recommended that you maintain a short GI. normally you can configure that the access point will use. This should only be a temporary configuration change. 6 µs or 3. Short Guard Interval (SGI), 20 and 40 MHz • Primarily used on AP side to reduce Guard interval between frames to improve performance • Helps improve data rate in Up/Down. 8 µs, 1. (Sorry for bad english)Configure the guard interval for the network by entering this command: config 802. Cases 33-64 repeat the same. Этот интервал помогает при. Default. When short guard interval is used (400ns GI), a subcarrier carries 312. Join. This interval helps data reception avoid delays due to Inter. 11ad 1x1 (2502. Enable or disable use of short (400ns) guard interval in 20 MHz mode. 11a, the only selection is a Guard Interval of 1/4 (1/8 is greyed). Also used in TDMA transmissions. 802. I was under the impression from reading online, that disabling frame aggregation and short guard interval would help with Macbook or apple computer connectivity. 3. On Radio settings disable Short Guard Interval and Aggregation. Currently short guard interval is not supported for Nv2 protocol. P. The guard interval is the dead time, in nanoseconds, between OFDM symbols. I want to know WHAT they do and what impact they might have on the network. For short guard intervals (400 ns): 0 to 16 samples. In the past few years, there have been impressive advances in experimental demonstrations of high SE multicarrier transmission employing narrow frequency guard interval and higher-order modulation format [20,71,76–78]. A method for receiving a beacon frame comprises the steps of: receiving a first beacon frame which contains guard interval type information; determining a second beacon frame which is to be received after the first beacon frame on the basis of the. What would be the downside of having a short GI? 9. The guard interval is a period of time inserted between symbols to mitigate the effects of multipath. Bên cạnh đó, kỹ thuật tập hợp khung (frame aggregation – FA) cho phép ghép hai hay. Guard Interval: 800ns: Security Settings: WPA2-PSK/WPA2-Enterprise: WPA Encryption: AES: WIFI 5G. Don’t. 5Gbps. The guard interval prevents Inter-Symbol and Inter-Carrier Interference (ISI, ICI). The baseline certification covers both 20 MHz and 40 MHz wide channels, and up to two spatial streams, for maximum throughputs of 144. The intention of PHY submission was to make short GI a mandatory feature in addition to normal guard interval. Short is 400 nanoseconds and long is 800 nanoseconds. 11ax has three types of GI – the normal GI (0. Short GI — A bit that indicates use of the 400 ns guard interval. 5 Gbps. The situation above can result in serious multipath time delay. In most cases a 400 nanosecond guard interval is sufficient and is referred to. You’d be missing a valuable opportunity to improve your network’s performance right from the get-go. It is referred as HT (High Throughput) specification. According to one embodiment, a wireless communication device includes a receiver configured to receive an orthogonal frequency-division multiplexing (OFDM) signal. 11n in the Mode field of the Basic Settings area, the Short Guard Interval Supported drop-down list will be available. string. When you add a guard time, the back portion of useful signal time is copied and appended to the front. 1e B. You can see the gains that a short guard interval provides in the 802. • Modulation Scheme OFDM and DSSS/CCK. You should be able to see it in a packet capture of the beacon. 4 GHz. Most reflections will be received quickly. TX Power Control. 800 ns D. Guard interval wifi hanya berfungsi untuk memperkuat sinyal wifi pada jarak dekat, namun tidak efektif dalam mengatasi interferensi gelombang wifi. When Short GI is enabled, the guard interval will be set as 400ns and this function will boost the performance about 11%. 11ac). Short Guard Interval. 11ac has two Guard Interval (GI) options – long GI (800ns) and short GI (400ns). The long GI successfully protects OFDM transmissions under most conditions. A short preamble improves throughput performance. Scrambler Initialization Range: 0 to 127 Default: 93 Set the initial state of the scrambler in decimal format, which is then turned into 7 bits to feed into the scrambler. Short Guard Interval (400ns) DSSS with DBPSK and DQPSK, CCK modulation with long and short preamble OFDM with BPSK, QPSK, 16QAM, and 64QAM modulation. 1 summarizes the most recent records for high SE multicarrier transmission. ), these options may introduce transmission. The SGI (Short Guard Interval) defines the time interval between transmitted symbols (the smallest unit of data transmitted at one time). (Sorry for bad english) Configure the guard interval for the network by entering this command: config 802. En Wi-Fi se ha usado siempre un Guard Interval de 800ns de tiempo, pero para aumentar la velocidad máxima teórica, en el estándar Wi-Fi 4 se introdujo el «Short Guard» que utiliza 400ns. Other design thoughts: Use 40MHz bonded channels in 5GHz only to “double” your throughput. 11ac, Wave 1), the 203R Series APs are software-configurable to operate in either 1x1 dual radio mode or 2x2 single radio mode. Some outdoor deployments, may, however require a longer guard interval. Step 6. This parameter is enabled by default. A short guard interval of 400 nanoseconds (ns) works in most office environments as distances between points of reflection, as well as between clients, are short. The heartbeat interval default is 2 (200 ms). [All CWNA-107 Questions] You are reconfiguring an AP to use the short guard interval. There are a lot of. CRC: checksum of previous 34 bits. r/wifi. Some have mentioned low power small cells. For 802. 5 Mbit/s per MHz and spatial stream, or slightly more than half the advertised bitrate. 802. SGI is a scalable, extensible, robust protocol that is used for Cisco IOS software. 4. Pada Wifi, OFDM disediakan 2 Guard Interval o Long GI: 800 ns o Short GI: 400 ns Karena kanal sudah di pecah-pecah menjadi carrier yang kecil-kecil dan saling ortogonal, maka aman jika di terapkan Short GI. Symbol duration 3. I finally found the answer by going through all of the advanced options in my router and changing each until i finally got it working. Channels. Learn about the benefits of our new ePMP release 4. Your go-to short for metcons, HIIT sessions, short runs, and anything else you can think of. Channels. According to one embodiment, a wireless communication device includes a receiver configured to receive an orthogonal frequency-division multiplexing (OFDM) signal. Optionally, enable automatic adjustment of transmit power, then specify the minimum and maximum power levels, dBm. Enable automatic or manual adjustment of. Select to enable the short guard interval. 8 HT-STF HT short training field To improve AGC estimation for MIMO system. Short Guard interval & Aggregation In the screen shot above you will notice that Short Guard Interval and Aggregation are both disabled. 4Ghz long guard interval. 400 Mbps (two spatial streams at 40 MHz short guard interval) This is a full third faster than the comparable 802. Short Guard Interval (SGI) is a protocol that lowers the guard interval by 400ns and improves the wireless data rate. People, be good wifi neighbors. The guard interval is a pause in transmission intended to avoid data loss from interference or. ao link. 11n you can choose between a short guard interval and a long guard interval. #1. since 802. If it's set to any, it defaults to 400ns for compatible clients. Choices: "enable" "disable" spectrum_analysis. "any" will use either short or long, depending on data rate, "long" will use long. 11n. short-guard-interval. If the short guard interval does not allow enough time for reflections to settle in your mesh deployment, inter-symbol interference values may increase and degrade. For HIPERLAN/2, both 1/4 and 1/8 are selections. Nah, selanjutnya, tekan login. GUARD INTERVAL The Symbol Period for Wi-Fi is 1/250,000th of a second or 4000ns Of that 4000ns, by default, 3200ns of it is used for transmission, 800ns is used for silence between symbols. These high throughput wireless standards have a large pool of link configuration parameters at the both physical (PHY) and media access control (MAC) layers, which include channel bonding, multiple input multiple output (MIMO) technology, short guard interval, advanced modulation and coding schemes (MCS), frame aggregation,. Use Short Guard Interval (SGI) if you can - it may squeeze a bit more throughput through with your 11n/11ac clients. The guard interval is a pause in transmission intended to avoid data loss from interference or multipath delays. 11n/ac/ax/be) Menu Path: MeasSetup > IEEE 802. 11 operation, the guard interval is 800 ns. radio profile radio_ng_ng0 short-guard-interval. Short Guard Interval - Enables/Disables Short Guard Interval. What is the 11n guard interval? Intersymbol interference, also known as ISI, is eliminated by the guard interval. 11ac, the Long Guard Interval (LGI) factor is 4 and Short Guard Interval (SGI) is 3. MU-MIMO is an enhanced form of the MIMO. Hence, in TGaf capable devices shall support both guard interval modes (short and normal). 11 OFDM is 800 nanoseconds in duration. If you are using 802. Cisco supports SGI on a 20MHz channel in. Select Enable Short Guard Interval to enable it. Jun 11, 2017. A short guard interval of 400 nanoseconds (ns) will work in most office environments as distances between points of reflection, as well as between clients, are short. Verify Short Guard Interval (SGI) is checked. 5 GHz: Four RP-SMA connectors for external antenna operation. Otherwise only Downlink performance (AP to STA) will improve. 2. 11n data rate chart (Table. In one embodiment, the disclosure can define three types of the GI and SC data block, for example, short,. The guard interval between symbols helps receivers overcome the effects of multipath delays. - Change Radio 2 Band to "802. . Select the check boxes of the desired rates to specify the modulation and coding scheme (MCS) rates at which data can be transmitted between the access point and the client. Wi-Fi 6 (also known as 802. 4µs ลดเวลารอครึ่งนึง ทำให้ส่งข้อมูลได้มากขึ้นในระยะเวลาที่. نقدم لكم في هذا الفيديو طريقة ضبط transmit power الراوتر we الجديد وهو المسئول عن قوة تغطية الشبكة الراوتر we الجديد. For normal guard intervals (800 ns): 0 to 32 samples. The short guard interval is also enabled. 2 microseconds of. Some outdoor deployments, may, however require a longer guard interval. It improves link reliability for longer-range outdoor. Một kỹ thuật được gọi là Short Guard Interval cũng có thể góp phần cải thiện khoảng 10% tốc độ. 11 {a | b} 11nsupport rifs rx {enable | disable} Save your changes by entering this command: save config Short guard interval (SGI) is a new feature of the physical (PHY) layer in High Throughput Wireless Local Area Networks (HT-WLANs), like IEEE 802. The clients are all 802. 4). On Advanced tab: set Preamble Length to Short. It misses 20% to 30% of short guard interval packets. Guard interval is a period of time between symbols that accommodates the late arrival of symbols over long paths. 802. 11, the channel bandwidth was 20MHz with later amendments adding support for 5 and 10MHz bandwidths. This option is only available for 5GHz 802. 11n specs. The. 802. 4µs ลดเวลารอครึ่งนึง ทำให้ส่งข้อมูลได้มากขึ้นในระยะเวลาที่. 4 GHz Two RP-SMA connectors for external antenna operation. This is kind of half right. Short GI = good, association and signal is robust, so wireless frames use a shorter interval spacing to save time on the channel, thus increasing throughput. They both function best in optimum network conditions where users have strong signals with little interference. Reply. Yes — Reduces transmission time to every 400 nanoseconds when communicating with clients that also support the short guard interval. Короткий защитный интервал SGI (Short Guard Interval) определяет интервал времени между передаваемыми символами (наименьшая единица данных, передаваемых за один раз). 11n data rates for the MCS for 80 MHz transmissions using a short guard interval. Enable/disable short guard interval. The SGI (Short Guard Interval) defines the time interval between transmitted symbols (the smallest unit of data transmitted at one time). ap (config-if)#guard-interval long. Systems, methods, and other embodiments associated with a single stream wireless communication with a greenfield preamble that uses a short guard interval are described. 8 μs, to increase data rate 802. Short Guard Interval Choice: On|Off Default: Off Determine whether the OFDM symbols adopt the short guard interval which is 400ns. This refers to a pause in transmission intended to avoid data loss from interference or multiple delays. Wi-Fi Radio Specifications. 11 {a | b} 11nsupport guard_interval {any | long} Configure the Reduced Interframe Space (RIFS) for the network by entering this command: config 802.