Lower RTS Threshold. 4 μs guard interval which provides about a 10% increase in data rate. At runtime, the calling function validates object settings for properties relevant to the operation of the function. Select Channel WidthIt produces this output for the main 802. 4. 1. Select 20MHz or 40MHz channel width. "Short" and "Long" training symbols. MenuChoose Wireless > 802. 2,501. 6, or 3. 802. The SGI (Short Guard Interval) defines the time interval between transmitted symbols (the smallest unit of data transmitted at one time). When short guard interval is used (400ns GI), a subcarrier carries 312. 11a/n /ac or 802. Systems, methods, and other embodiments associated with a single stream wireless communication with a greenfield preamble that uses a short guard interval are described. By using different SCS in 5G NR, different slot durations and TTIs are configurable. 11a, 802. 11n and 802. A data frame, or simply called a “ frame ” is a package of data exchanged between wireless devices. If you are using 802. Dengan memposisikan routers di tempat yang strategis, maka jangkauan wifi juga akan lebih maksimal. UWB (Ultra Wide Band) is the PHY defined in IEEE 802. 802. For example something like the following: ht_capab= [HT40-] [SHORT-GI-20] [SHORT-GI-40] I just do not know if this is all that is required and in any case how can I confirm. For 802. Cara pertama yang dapat Anda lakukan adalah dengan memastikan bahwa router diletakkan pada posisi yang strategis. Coding: SU/MU[0] Coding: Possible values: BCC, LDPC, or binary digit (indicating the value of a reserved bit). Only some vendors support SGI on 20MHz channels in the 2. Wi-Fi 6. (Guard Interval) a «Corto» o «Short». 11n protocols is plot- ted for MCS values 1 to 8 for short and long GI in Figures 3 and 4 with channel. Enable Airtime Fairness. 11 ac - Very High Throughput 2. 802. Short Guard Interval. 3A Other languages German (de) French (fr) Other versions. 11a/b/g used a mandatory 800ns guard interval. 802. VLAN TRUNK Tugas 10-KJ-UINK-10651033. 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. 11acは、Wave1とWave2の2つの規格に細分できます。. 4, 5, and 6 GHz frequency bands. set rogue-scan [enable|disable] set rogue-scan-mac-adjacency {integer} set short-guard-interval [enable|disable] end config system wireless settings. bangarang roblox id. 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. Table 8. 11n. US20160204968A1 US15/075,823 US201615075823A US2016204968A1 US 20160204968 A1 US20160204968 A1 US 20160204968A1 US 201615075823 A US201615075823 A US 201615075823A US 2016204968 ABy making the guard interval larger than the expected multipath delay spread, ISI can be completely eliminated. Wi-Fi 6 is designed for high-density wireless access and high-capacity wireless services, such as in outdoor large-scale public venues, high-density stadiums, indoor high-density wireless offices, and electronic classrooms (e-classrooms). 400msec - short guard interval. 11b/g Wireless Settings. They will not work, no way no how. Like within 2 rooms close, ideally the same room. Two settings are available: short (400ns) and long (800ns). 802. Hardware Overview Indoor Model WAX610; 10 Hardware overview indoor model wax610 11 Top panel with LEDs, indoor model. This can improve outdoor Wi-Fi throughput for these devices by 50%. Cara setting WiFi IndiHome agar jangkauan jauh harus diketahui para penggunanya. Figure 33: 800 nanosecond GI (long guard interval) Long Guard Interval – 802. • Primarily used on AP side to reduce Guard interval between frames to improve performance. 93 Gbps ( using 160MHz bandwidth, 8 spatial streams, MCS9, 256QAM, with short guard interval) and coverage range of approx. 11 operation, the guard interval is 800 ns. 4. Band: เลือกวง 2. 11 is 800 ns. Basic Configurations Commands. 11g standard in the 2. 64 QAM. run short unless you are seeing issues, or even better, try both and see what effects it has on your network. Enabling a short guard interval can decrease network overhead by reducing unnecessary idle time on each AP. 11b 11nSupport guard_interval ? any Enable 802. When Shortslot override is enabled, the wireless device uses the short slot time only when. Enable/disable spectrum analysis to find interference that. MCS = higher is better. 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. 11ac, short guard interval (400 ns) is introduced while the default value of GI is still set as 800 ns. CRC: checksum of previous 34 bits. protected by a Guard Interval (short or long)* Note: The wider the channel, the more sub-channels available however, range is reduced because the same amount of poweris now spread across wider spectrum–so receiver has to work harder to hear the weaker signal. 11ac tutorial covers WLAN 802. Berikut ini, beberapa langkahnya. Titik Penempatan Router yang Strategis. 11b/g/n > Network to open the Global Parameters page. Since you asked, the guard interval is the tiny amount of time (like 400 nanoseconds) that the transmitter waits between sending one "symbol" (think, "one indivisible group of up to. All clients and access points on overlapping channels talk to each other. You need this mode if your wifi cards connected to multiple hosts. I picked up a WRT-160N wireless router hoping to use it relieve the stuttering when streaming HD content over my WRT54G network. If you are constantly getting disconnects then it might be a faulty router or an issue with overlapping. All the data rates mentioned are with short Guard Interval. Short Guard Interval. 4) Alternatively, if your setup has all. The subsequent 24 modes run by this program are variations with short guard interval enabled (cases 9-16), and then with channel bonding enabled. WPS (Wi-Fi Protected Setup) can help you to quickly and securely connect to a network. Yes, it should be 50-60 MB/s as shown on windows explorer speed. Wi-Fi 6 is higher density. 1. If the symbol waveform is extended periodically. The guard interval is at a very basic level. 4 µs to 0. 11n systems using OFDM had defined data rates between 6 and. Using the short guard interval, the symbol length becomes 3. (with short/long guard interval (GI)), 1 MHz channel bandwidth. The invention relates to a switching method for a long guard interval and a short guard interval and a module thereof. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Do not mess around with setting you do not full understand. 25 KHz for 802. 0 - Short Preamble. VIP Options. จะวิ่งที่ 150 Mbps ต้องใช้ MCS7+40 Mbps+Short Guard Interval ตัวรับทั่วไป เสาเดียว อาจ. Jangka waktu yang ditentukan digunakan untuk memisahkan transmisi sehingga tidak saling mengganggu. 802. 15. ในการทำงานกับ WIFI ค่าอะไรบ้างที่เราจำเป็นต้องรู้ เพื่อใช้ในการวิเคราะห์ปัญหา ได้อย่างแม่นยำและถูกต้อง. Single radio/antenna devices do not support mimo and still having trouble with inter symbol interference by multipath, especially in warehouses where barcodescanners are used. kelompok 4. Wi-Fi radio test subcommands. Short GI: Y = short guard interval used in the VHT-Data field of the preamble. There are four options to append samples in the guard time. 5G has bigger slot widths but. since 802. The Wi-Fi will have a lot of interference and start dropping packets if it is using a channel too crowded. disable. The need for a long guard interval of 800 ns becomes more important as areas become larger, such as in warehouses and in outdoor environments, as reflections and echoes become more likely to continue after the short guard interval would be over. Kamu bisa membatasi jarak jangkauan WiFi dengan mengubah menu “Transmitting Power”. In IEEE 802. Overview. Single radio/antenna devices do not support mimo and still having trouble with inter symbol interference by multipath, especially in warehouses where barcodescanners are used. In most of the cases clients negotiate with SGI-False (LGI) flag. 2. 1 summarizes the most recent records for high SE multicarrier transmission. Early WiFi 6 clients might not support uplink MU-MIMO and for the ones that do, the implementation is not yet mature across client manufacturers. long and "any" is still "long" resulting to 130/270Mbps. Bandwidth is the key here. 11n mode allows for a reduction in this guard interval from the a and g definition of 800 nanoseconds to 400 nanoseconds. offcourse the traffic is mostlyDCooper. Short is ideal, but I'd imagine most people need to use Long, again, unless you have your AP's very close to the SS devices they're connected to. Wireless Networking. WiFi-5 supports maximum data rate of 6. At runtime, the calling function validates object settings for properties. It will build upon 802. an 80 MHz transmission sent at 256QAM with three spatial streams and a short guard interval delivers 234×3×5/6×8 bits/3. 1 Insight managed wifi 6 ax1800 dual band access point 1 Models 1 User manual 3 Contents 8 1. 1. Step 9. Image Courtesy: Ruckus Networks. What is the 11n guard interval? Intersymbol interference, also known as ISI, is eliminated by the guard interval. 8, 1. Learn more. 800/1600/3200 ns. 4 GHz than 5 GHz band to make 5 GHz signal stronger than 2. For 802. Some have mentioned low power small cells. The Other selection allows the input of a non-standard Guard Interval value between 0 and 1. One of the new additions in the IEEE 802. . The guard interval is there to eliminate inter-symbol interference, which is referred to as ISI. Straight forward really. For that you need two spacial streams (2x2), a 40 MHz (effective) channel bandwidth, and a short guard interval (short GI - about 400ns). 11n mode allows for a reduction in this guard interval from the a and g definition of 800 nanoseconds to 400 nanoseconds. 11b devices can connect when many 802. ) tackle delay spread by adding a cyclic prefix (CP) before the start of the OFDM symbol. The guard interval in a typical 802. The default value is enabled. That is when a unit hears a packet exceeding its strength threshold on same transmission channel, even if it doesn’t belongEn los routers de ASUS, en el menú de « Configuración avanzada / Wireless » tenemos los menús específicos, tanto para la banda de 2. Enabling a short guard interval can decrease network overhead by reducing unnecessary idle time on each AP. Titik Penempatan Router yang Strategis. 11a, the only selection is a Guard Interval of 1/4 (1/8 is greyed). e. ap (config-if)#interface dot11radio0. About This Document. normally you can configure that the access point will use. -ให้ปรับ 11n guard interval เปลี่ยนจาก Long >>>short แล้วเซฟ เราก็จะได้สปีดการเชื่อมต่อ WiFi ที่ 150 mbps หรือ 300 mbps (MIMO) ขอให้โชคดีครับGuard Interval For outdoor devices, Max WiFi allows data to be sent using a longer guard interval with only minimal impact on efficiency, providing extra protection against inter-symbol interference caused by multipath delay spread as the data moves longer distances. In mixed radio environments, some 802. Orthogonal Frequency Division Multiplexing (OFDM)/Discrete Fourier Transform-spread-OFDM (DFT-s- OFDM) based systems (for e. 8µs) and short GI (0. A long interval can save power on sleeping clients, a short interval can improve connectivity in poor reception situations. Occasional Visitor. Select the wireless protocol from the dropdown list. Router manufacturers support different versions of 802. Step. 11n outlined the idea of a short guard interval, decreasing. 11 11nsupport guard-interval long. This guide covers the options for SSID, TX power, channel, and more. It's a 5Ghz long range network. 11b/g/n /ax > Network to open the Global Parameters page. Nilai default adalah 100 (unit adalah milidetik, atau 1/1000 detik). Date to Enable Radio (week days): This field defines the dates the wireless network is enabled. At 240kHz SCS (for control only), 14 symbols are squeezed into a 62. shortest guard timesHowever, long guard intervals consume a greater proportion of a symbol and thus cause a lower throughput than a short guard interval that occupies less time. Until 802. packet capture and processing are done on the local host. #1. Guard Interval เป็นห้วงเวลาที่ป้องกัน Packet ของข้อมูลชนกันเอง ซึ่งจะมีสองแบบ คือ Short 400 และ Long 800 ns (นาโนวินาที) โดยแบบ Short 400 ns จะสามารถใช้งานได้. The following OFDM symbol contains HT long training sequence, which replaces the legacy channel gain inside equalizer. WPS (Wi-Fi Protected Setup) can help you to quickly and securely connect to a network. Single radio/antenna devices do not support mimo and still having trouble with inter symbol interference by multipath, especially in warehouses where barcodescanners are used. 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. Wireless Reliability - Guard Intervals. 11ax features. Adjust channel bandwidth. Short Guard Interval In normal 802. ) Active Application number EP12721137. subtype == 2) Here is what you see in the packet capture: Two information fields are very interesting:Choose Wireless > 802. As can be seen, the physical layer data rate mayLos dispositivos inalámbricos "b" más recientes que utilizan un preambulo más corto suelen experimentar transferencias de datos más rápidas. 11n bands. Occasional Visitor. 11n-2. GI模式配置为short <AC> system-view [AC] wlan [AC-wlan-view] radio-5g-profile name default [AC-wlan-radio-5g-prof-default] guard-interval-mode short: 无线信号在空间传输会因多径等因素在接收侧形成时延，若数据帧之间间隔太短，容易和前后的数据帧形成干扰，而GI就是用来规避这个干扰的。IEEE 802. 1 Channelization When the OFDM PHY was introduced to 802. The purpose of a guard interval is to introduce immunity to propagation delays, echoes, and reflections to which digital data is normally very sensitive. This gives a safe time between transmissions. 2 µs. I assume you mean Short Guard Interval (SGI) when you say GI? If so, with other vendors that I've worked, I've been able to enable/disable SGI across all of their APs that I've worked with (which is more extensive with some vendors that others). By reducing the overhead of extra idle time between transmissions of two successive symbols, SGI helps to enhance the. Indeed, the shorter guard interval evidently results in intersymbol interference (ISI) and intercarrier interference (ICI), but the gain offered by shortened guard interval may exceed the loss caused by interference. Regards, ParikshithA silent guard interval would likely increase PAPR (peak to average power), which requires a sender capable of more dynamic range (without clipping or generating power supply noise, etc. Spread Spectrum Technology. 4µs ลดเวลารอครึ่งนึง ทำให้ส่งข้อมูลได้มากขึ้นในระยะเวลาที่. guard interval guard intervals Prior art date 2011-05-18 Legal status (The legal status is an assumption and is not a legal conclusion. Tg is the guard time interval and Ts is the data symbol period. Likewise, having a 2x2 adapter does not guarantee ~300 Mbps on Wireless N. 11n 针对 802. The 802. 11n-2. 11b, 802. Fitur ini berguna untuk komputer yang dikonfigurasikan untuk memasuki mode tidur karena pesan DTIM akan memberi tahu klien bahwa router wireless memiliki informasi yang harus dikirim. I haven't heard before of this support for SG. The longer guard intervals will enhance delay spread protection. Source is a decade plus of setting up wifi networks. The OSI model describes how information moves from an application program running on one networked computer to an application program running on another. 4. Pilih Wi-Fi control untuk masuk dalam pengaturan Wi-Fi yang Anda inginkan. patoberli. Version:V200R019C00. This option is only available for 2. 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。 GI，即Guard Interval，中文叫保护间隔。 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。 802. Step 9. Created On 14 maja 2020. The 802. WLAN frame structure consists mainly PLCP Preamble, Signal (Header) part and Data Part. Version:V200R019C00. You can change it like this: (Cisco Controller) >config 802. Configuration. Using guard time requires extra time and energy, which is critical in wireless sensor networks operating on limited energy. 800/400 ns. 11a/g的GI时长为800ns，而Short GI时长为400ns，在使用Short GI的情况下，可提高10%的速率。 另外，Short GI与带宽无关，支持20MHz、40MHz带宽。 保护间隔（Short Guard Interval)：是OFDM符号中用于减少符号间干扰的时间。There are three modes of wfb_rx: Local receiver -- I. Multi-user: indicates the coding for user 0. Thanks. Short guard interval time is 400ns, which is half of what it was previously. Wi-Fi 6 (also known as 802. 1024 QAM with MCS 10, 11. Penambahan guard interval wifi dapat menambah konsumsi daya baterai pada perangkat wifi, karena durasi antara sinyal yang dikirim dan diterima menjadi lebih lama. Select to enable the short guard interval. 例えば電気信号を無線. 11ac, short guard interval ( 400 ns) is introduced, while the default value of GI is still set as 800 ns. Sebab, terkadang jaringan yang diterima ketika mengakses Internet di HP maupun perangkat lain tak teraih dengan baik. My mbps used to be at 100 - 300 now it's capped at 65, I tweaked my router settings to 20mhz, short guard interval, Channel 10, to reduce interference, my mpbs was capped still capped at 300, but days later, now its at 65, could this be a settings problem or isp problem?. 8 μs) and three guard-interval options (0. To configure this parameter for a given device, the following lines of code could be used (in this example, it enables the support of a short guard interval for the first station):. Expanded Wi-Fi Coverage. # wireless client association limit 50 interval 1000:. 11ac and 802. 11g, 802. 15. ) Otherwise leave off3. 11b/g used a longer guard interval than 802. Last Updated On 12 lutego 2021. Note that option htmode should be set to either HT40+ (for channels 1-7) or HT40- (for channels 5-11) or simply HT40 . 5kbps. 4GHz band supported channel bandwidths: 20MHz Y N 5 GHz band supported channel bandwidths: 20 MHz Y Y 5 GHz band supported channel bandwidths: 40 MHz Y Y 5 GHz band supported channel bandwidths: 80MHz Y Y Short/Long Guard Interval (400ns/800ns) Y Y 11ac Data rates – Up to 433. A GI is a period of time between symbol transmission that allows reflections (from multipath) from the previous data transmission to settle before transmitting a new symbol. WiFi 101 Blog Asset Management Asset Management Tool Hardware Summary Support Purchases - SPA Required Activate Purchase - Purchase Code Required Cloud Subscription Purchases. WPA2-PSK/WPA2-Enterprise. 11n on 5GHz. 11€{a€|€b}11nsupport guard-interval€{any€|€long} Sniffer Tools Wireless Sniffing with a Mac with OS X 10. 11be, dubbed Extremely High Throughput (EHT), is the next amendment of the IEEE 802. 802. Hi DCooper Thx for the feedback, love the learn ;). . Configuring your beacons properly has a significant impact on how your network performs. Header part consists of 24 bits which is always BPSK modulated. 802. 8µs กับ Short Guard Interval (SGI) 0. Devices that take advantage of the phase 2 parameters (8 spatial streams, 160 MHz of bandwidth and 256-QAM 5/6 with a short guard interval) can achieve almost 7 Gbps. If you use 40 MHz channel the max data rate will be 270 Mbps and 300 Mbps for long and short guard interval respectively. As discussed Short vs. In order to dissect the Guard Interval it is important to think of the signal transmissions from the viewpoint of the. Here is the format of the frame: The trigger frame is a broadcast frame and you can use this filter to fidn it in Wireshark: wlan. GI模式配置为short <AC> system-view [AC] wlan [AC-wlan-view] radio-5g-profile name default [AC-wlan-radio-5g-prof-default] guard-interval-mode short: 无线信号在空间传输会因多径等因素在接收侧形成时延，若数据帧之间间隔太短，容易和前后的数据帧形成干扰，而GI就是用来规避这个干扰的。Short GI: disabled – Short Guard Interval decreases the time between data characters being sent wirelessly. 125 KHz, compared to 312. 4 GHz. 4GHz spectrum. The short guard interval time is 400ns, or half of what it used to be. 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). Wi-Fi 6 isn’t faster than Wi-Fi 5. 11 guard interval. thecompnerd. OFDM. Different Guard Interval Techniques for OFDM: Performance Comparison 3 Figure 2. guard time. 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. 11g, 802. 5. You can change it like this: (Cisco Controller) >config 802. Guard Interval เป็นห้วงเวลาที่ป้องกัน Packet ของข้อมูลชนกันเอง ซึ่งจะมีสองแบบ คือ Short 400 และ Long 800 ns. The guard interval is the period in nanoseconds the radio listens between packets. 11ah Wi-Fi Solution for IoT Devices. An entire OFDM symbol, as used in Wi-Fi on standard width channels, requires four microseconds. I recently got a Unifi system, thinking they would be customization since it's enterprise, but there is no way to adjust advanced wireless settings such as "Frame aggregation", "Preamble Length", and "Short Guard Interval". Each transmission burst in 802. 11n Guard Interval. First you should never play games on wifi in the first place if you care about good performance. I changed HT Guard Interval on CPE from 'long' to 'any'. Support of the 400ns GI is optional for transmitting and receive. 2 microseconds (μs) and only two Guard Intervals (GI) of 400 or 800 ns to a longer Ts (12. 11n/ac/ax/be, the Guard Interval selection is 1/4, 1/8, or 1/16. 11ax defines three-guard intervals of . RTS is used with CTS (Clear to Send). First you should never play games on wifi in the first place if you care about good performance. OFDM. There may be a way via the command line, and if anyone knows, please tell me. How to Use Command Lines. Configure the guard interval for the network by entering this command: config 802. 11b, 802. 5µs slot. 4G - your settings may vary. 256 QAM. 11 standard, which will be designated Wi-Fi 7. packet capture and processing are done on the local host. with a short guard interval) will be able to achieve almost 3. cushion between frames. 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. Throughput is expected to reach a theoretical maximum of. subtype == 2) Here is what you see in the packet capture: Two information fields are very interesting:Learn how to create a FortiAP profile to configure the radio and network settings of your FortiAP devices. on an interesting test site, i. fc == 0x2400. For comparison, this Netgear product, a combined router and Wi‑Fi access point from 2013, uses the 802. ) Active, expires 2032-07-17 Application number US13/465,347 Other languages English (en) Other versionsThe standard guard interval used in 802. Select to enable the short guard interval for 802. 4Ghz long guard interval. Congestion Issue WiFi has no congestion detection, and its mechanism is designed for avoiding collisions. NOTE: The short frame is only available when the specified wireless mode includes 802. It has the following characteristics: Type: Control ( wlan. Dengan memposisikan routers di tempat yang strategis, maka jangkauan wifi juga akan lebih maksimal. 25 KHz for 802. 11n, the guard interval has been reduced from 800 ns to 400 ns to boost the throughput. The 802. 11a/g. Short GI NSYM Disambiguation — A bit that indicates if an extra symbol is required when the short GI is used. Wi-Fi beacons are relatively short, regular transmissions from access points (APs) with a purpose to inform user devices (clients) about available Wi-Fi services and near-by access points. Download Citation | Study of Guard Interval Duration on the Operation Impact of IEEE 802. With both 40MHz and 20MHz channels, it’s definitely worth testing with SGI. 4 GHz or 5 GHz. Now, if you use short guard interval the max data rate will increase to 144. fc. • Helps improve data rate in Up/Down if both AP and STA support Short GI. It’s generally recommended that you maintain a short GI. Normalmente los routers están configurados de manera predeterminada con un «Short Guard», por tanto, tendremos la máxima velocidad posible. ap dot11 {5ghz | 24ghz} dot11n guard-interval {any | long} Example: Device (config)# ap dot11 5ghz dot11n guard-interval long: Configures the guard interval for the network. VHT Guard Interval. 123,140. Enclose each property name in quotation marks. As discussed earlier, OFDMA combines sub-carriers to form resource units (RUs), or sub-channels, of different widths. 11ac as long as additional features like WPA, WEP, AES encryption, Wireless Distribution System (WDS), Dynamic Frequency selection (DFS), Virtual Access Point, Nstreme and NV2 proprietary protocols and many more. The DTIM interval is essentially meaningless and can be safely ignored. 2 - Mixed Preamble. 11a/g radios use an 800 nanosecond guard interval (GI) between OFDM symbols. 47 Gbpsのデータ. The Guard Interval time period T (GI) is specified as a fraction (percentage) of the inverse FFT time period T (IFFT). However, it will the take a long time for WLAN terminals to scan for Access Points in the area and to update RSSI and load information for already found Access Points. 11ac is not directly defined in data rates speed, but is rather a combination of 10 modulation encoding scheme (MCS 0 to MCS 9), a channel width ranging from 20mhz (1 channel) to 160Mhz (8 channels), a number of spatial streams (typically 1 to 4). The CPE disconnected with control frame timeout and does not connect again. 4 物理层帧. TDMA (time division multiple access) is a technology used in digital cellular telephone communication that divides each cellular channel into three time slots in order to increase the amount of data that can be carried. 11ax is the smaller subcarrier spacing (78. 11a/g, except the number of. 11ac, short guard interval (400 ns) is introduced, while the default value of GI. #1. 2,493. Nilai default adalah 100 (unit adalah milidetik, atau 1/1000 detik). (config)# ap dot11 5ghz dot11n guard-interval long: Configures the guard interval for the network. since 802. r/wifi.