1G copper ports with PoE/Cisco UPOE®/UPOE+ Cisco Catalyst 9300 Series Extended Catalyst 9300 Series with Catalyst 9300X models Multigigabit models with UPOE. Interface and Hardware Components Configuration Guide, Cisco IOS XE Dublin 17. I've found this to be true with several different 9300 switches now. All the other modules use an 18-AWG cord. Cisco Catalyst 9300 Series Switches 24-port modular uplinks data only, Network Essentials C9300-24T-E [email protected] +86 13599513131;. Yes. Power supplies . Hello, There are a couple of switches in the 9300 and 9200 series which use the UCSC-PSU-930WDC power supply - for example 9396px, 9372px, 92160YC and so on. 這類網路交換器是專為安全、物聯網及雲端所打造，可為思科領先業界的企業架構──軟體定義存取──奠定基礎。. IOSXE 16. The modules use an 18-AWG power cord. Command Reference, Cisco IOS XE Bengaluru 17. 11. 4 lb (11. Each PSU has a power holdup time of approximately 20 milliseconds at 100 percent load. 6 Helpful. MIBs. Table 9. 48 This step is not required when ordering fixed uplink models (C9300L SKUs) since they have fixed uplinks that are already part of the SKU. The external power supply option allows for additional power capacity or serves as a backup in case of a failure. Combined Mode. Default AC power supply 715W AC 350W AC. Eight number-8 Phillips flat-head screws Table 1. 第3步：使用 show run 命令，以验证 power inline never 端口上未配置接口。. The Cisco Catalyst IE9300 Rugged Series Switch supports two hot-swappable, redundant, load-sharing FRU power supplies. I need to know what will be the heat dissipation from this switch if it is 85% POE loaded, all POE devices will be installed outside the network cabinet. Cisco Catalyst 9300 Series Switches Hardware Installation Guide . IOS ver 12. 6. Cisco NX-OS Release 10. Troubleshooting or return, need to check serial no. Device# power supply 1 slot A on Jun 10 04:54:39. The default is for both power supplies to be on. •on—Setthepowersupplyon. Power Cord for AC V2 Power Module (USA), NEMA L6-20P. Downlink Supported Speeds. These are the most common issues: If a power supply on a Catalyst 4500 or 4000 chassis is in an errDisable state in the output of the show power command, there are two different types. To see which FEXs are supported by the Cisco Nexus 9300 switches, see Table 1-3. 01 MB) View with Adobe Reader on a variety of devicesSwitch two is: bootstrap 16. Cisco Catalyst 9300 Series switches (C9300 SKUs) support optional network modules for uplink ports (Figure 2). Hi everyone, using cisco power calculator for C9300-48U model and by adding few POE devices, the results shows that the switch typical power consumption without POE is 135W, and Total PoE Output Power Used is 662. Catalyst 9300 and 9300X Switches Fixed stackable switches for business-critical lean-branch and campus access networks. 03-12-2023 04:55 AM. 77 MB) Table 1. They also support RPS2300 for redundancy. Step 4. Buy License, need to check UDI. Nexus 9300 1200W Universal Power Supply, Bi-directional air flow and Supports AC/HVDC. For information about the power supplies. If only one power supply is installed, it should always be in power supply bay #1. 12-05-2019 02:07 PM. Cisco Catalyst 9300 Series Switches Hardware Installation Guide . 9. ステップ 2. In the next example, power supply inserted in slot 5 is configured as standby: Switch(config)#power redundancy-mode switch 1 redundant N+1 5 Redundant Mode N+N For this mode n number of power supplies are active and n number of power supply modules are configured as standby. Power Supplies (up to 2) 650W AC, 930W DC, or 1200W HVAC/HVDC . PWR-C1-715WAC-P. 02-11-2014 07:24 AM. 7301#show environment all . . A single IP address is used to identify the switch stack. Chapter Title. –The switch is in StackPower mode and sufficient power is available (Catalyst 3750-X only). 0223 Search: Search. The 8ft power cord is equipped with a 5-15P plug, a standard NEMA configuration often found on power strips, surge protectors, and other electrical equipment. All switches ship with the 650W/950W/1600W AC power supply as default. 73 x 17. 5 kg) Cisco Nexus 9236C without power supplies or fans. INPUT OK. Cisco Catalyst 9300 Series Switches Hardware Installation Guide . Cisco Nexus 9316D-GX without power supplies or fans. For information about the power supplies. Replacing a Power Supply Module The switch requires two power supplies for redundancy. Both power supplies are. Cisco Nexus 9000 750W AC PS, Port-side Exhaust. View this content on Cisco. com. 480 Gbps. Power Specifications for Platinum Rated AC Power Supplies; Specification. x (Catalyst 9300 Switches). Step 7:This is an "unofficial" universal power supply that is compatible with the 3750E/X, 3850 and 9300. Stacking bandwidth. Cisco 8900/9900 Series; Power Supplies;. Buy Cisco and Meraki solutions with confidence from the UK's No. 24 or 48 ports with double buffers, MAC and IP scale and higher access control list (ACL) scale. 10. These models can be identified by the "T" in their model name. 25. Cisco Catalyst 9300 Series Switches are Cisco’s lead stackable access platforms for the next-generation enterprise and have been purpose-built to address emerging trends of Security, IoT, Mobility, and Cloud. Verify that both the AC OK and and PS OK power supply module LEDs are green. The AC power modules installed in RPS 2300 are not the same type. Cisco Catalyst 9300 Series Switches Hardware Installation Guide . 10. Cisco Catalyst 9300 Series Switches Hardware Installation Guide . Regard, If you found this post helpful, please give it Helphul. Learn more about how Cisco is using Inclusive Language. Yes. Published On: November 11ᵗʰ, 2022 07:00. The Cisco Nexus 9500 Series cloud-scale switches and select Cisco 9300 Series cloud-scale switches provide the ACI spine functionality in the Cisco ACI fabric. Cisco Catalyst 9300 Series Switches Hardware Installation Guide. N9K-C9364D-GX2A Cisco Nexus 9300 platform switch with 64 400/100-Gbps QSFP-DD ports and 2 1/10 SFP+. Plug the AC power cord into the AC power connector and into an AC. X (affecting 9300 only) and 16. The largest power supply is removed from the power pool to be used as backup power in case one of the other power supplies fails. The platform is enterprise optimized with an innovative dual-serviceable fan tray design, side to side airflow. Regular price $100. The IE-9320 model includes two stacking ports and an advanced feature set. 5. Step 2. Published On: May 31ˢᵗ, 2021 07:51. Cisco Nexus 9364D-GX2A without power supplies or fans. 5G/5G/10G mGig and 90W Cisco UPOE+ . [6] The switch ships with one power supply by default, and the second power supply can be purchased at the time of ordering the switch or at a later time. Dimensions (H x W x D) of Cisco Catalyst 9300L Series Switches. 208 Gbps on 24-port Gigabit Ethernet model. Regards, Deepak Kumar, Don't forget to vote and accept the solution if this comment will help you! 28 Helpful. Catalyst 9300 系列是業界最普遍部署的新一代堆疊式交換平台。. Each EPLD image that you can download from Software Download page, is a bundle of EPLD upgrades. 5G/1G/100M) Modular Uplinks 1100W AC C9300X-12Y 12 port 25G/10G/1G SFP28 Modular Uplinks 715W AC Some models have low PoE budget, such as C9300-48UXM that has a PoE budget of 490 W with 1100 WAC power supply, this can be misinterpreted as hardware failure. It lists the Platinum certified power supply modules and the default modules that are shipped with the switch. To minimize network interruption, hot swap the power supply under these circumstances: –The switch is connected to an XPS 2200 and sufficient power is available. The Cisco Catalyst 3750 Series stacks up to nine switches as a single logical unit for a total of 468 Ethernet or PoE 10/100 ports, or 468 Ethernet 10/100/1000 ports or PoE 10/100/1000 ports, or nine 10 Gigabit Ethernet ports. Free CCIE solutions and Live Chat are supported. Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 6. Power supply unit. Cisco Catalyst 9300 Series Switches Hardware Installation Guide . 715 W. 5 Inches 1. Stackable 24 10/100/1000 Mbps SFP ports; two power supply. secondary power supply, power cables, IOS Software version, SSD and so on). Installing a Power Supply. This power supply is the same form and fit, with a similar function as the default 250W power supply but provides a higher maximum output rating. Two power supply models are available: • 400 W DC-Input Power Supply. Power Supply. On the other end, the C15 receptacle provides a secure connection for. For example, a power supply C3KX-PWR-1100WAC and PWR-C1-1100WAC will work in a Catalyst 9300. Cisco Switch Shutdown Procedure. N9K-PAC-1200W-B. I am configuring a Cisco 9300 - 48 port switch that has two power supplies. –The switch is powered by other switches in a power stack, and no active backup is in. The power budget is usually related to the switch power-supply capability and the amount of delivered power. The power supply value (for example, 500W AC power supply: NXA-PAC-500W-PI) is based on the output rating to the inside of the switch Table 3 lists the performance and scalability specifications for the Cisco Nexus 9300-FX series switches. Bydefault,thedevicepowersupplyison. Cisco Catalyst 9300 Series Switches Hardware Installation Guide. The 3750X power supplies are compatible with 3850 and 9300 (I do not have any 3650 to verify this). Bydefault,thedevicepowersupplyison. 9800-L PSU . Input voltage. You need to consider the power supply you are going to use. power supply C9300X-48HXN 48 port Cisco UPOE+, 8x 10G Multigigabit (10G/5G/2. 3at mode, by default. 11-24-2019 11:03 PM. 11. If I have 1 single power supply in the switch and powered, it's quiet. Two power supplies (one used for operations and one used for redundancy) (AC power supplies shown) with power supply slot 1 on the left and. Additional port combinations can be created by connecting the Cisco Catalyst 3750-E Series Switches to the stack. Cisco bug ID CSCvp56289: 9300 switch silent reload with platinum power supply (PWR-C1-350WAC-P) Cisco bug ID CSCvv27849: Cat 9K & 3K: Unexpected reload caused by. For information about the power supplies. 0 Power available to the device: 15. 95 MB) PDF - This Chapter (1. UPOE+ delivers industry-leading density of standards-based IEEE 802. SUPPLY diverts materials from the landfill and puts them into the hands of people who need them by re. Figure 1. . Your network, your way. 1. Power Cord for AC 1900W Power. 6kW AC PSU is 1. 9 . We have multiple IOT PD devices connect to C9300, but they are detected as PoE class 3 device and C9300 allocate 15. I am using SNMP to read switch information from a Cisco 9300L Catalyst Switch and I am trying to figure out a direct reference tag/address that I can use to show the status of the two power supplies (redundant) as either On or Off. Ir a Contenido Principal; Ir a Buscar; Ir a Pie de Página;. Can contain one supervisor with up to two network modules, three security modules (blades) of one kind (either SM24, SM36 or SM44) and two power supply’s in the front. Note: This power supply is supported only by the Cisco Nexus 9364C-GX ACI -mode switch. Feature Information . These field-replaceable network modules with 25G and 40G speeds in the Cisco Catalyst 9300 Series enable greater architectural flexibility and infrastructure investment protection by allowing a nondisruptive migration from 10G to 25G and beyond. PDF - Complete Book (9. Note: The Cisco 9300 Series of switches also support 3850 uplink modules; Mounting Hardware: RACK-KIT-T1; ACCY-9300-KIT (Accessory Kit)Device# power supply 1 slot A on Jun 10 04:54:39. Get the 1100wac power supply. 12 MB) View with Adobe Reader on a variety of devices. C9600-PWR-2KWAC. 9. (-40. Device # power supply 1 slot A on Jun 10 04:54:39. Product Description. 手順. Installing a Power Supply; Installing a Fan Module; Installing a USB 3. Default power supply. Intellgent Power management-Cisco StackPower (5) Optional Power Supply (6) High- Efficiency Power Supply The Accessories Table 2 shows the recommended elements for theC9300-24T-A. Figure 5: White power supply and cord Figure 6: AIR-PWR-50 mechanicals - Spare part # AIR-PWR-50=. The Cisco Catalyst 9300 Series Switches are also built with the latest Cisco Unified Access® Data Plane 2. The Cisco® Power Calculator enables you to calculate the power supply requirements for a specific Power over Ethernet (PoE) configuration. 9300. PWR-C1-715WAC for the 9300 is $1295 list price, PWR-C5-1KWAC for the 9200 is $3150 list. ) • Off—Source AC voltage falls below 70 VAC, is not present, or the PEM is turned off. The power supply in the XPS can back up only one switch power supply and the XPS supply must be greater than the largest power supply in a switch connected to an XPS port in RPS mode. 4 W per port up to 48 ports depending on the FRU power supply. [6] The switch ships with one power supply by default, and the second power supply can be purchased at the time of ordering the switch or at a later time. Command References. Power supplies. Product description. PWR-C1-715WAC. 3. 1 authorised partner. AIR-PSU1-770W= Spare SSD for Cisco Wireless Controller 5520 and 8540. 350 W. If I have 2 power supplies in the switch and they are BOTH powered, it's quiet. 12-13-2005 11:01 PM - edited 03-03-2019 01:08 AM. 3 m stacking cable for Cisco. Please clear me here. Does anybody know how to use SNMP to monitor the status of the internal power supplies of a group of stacked Cisco 3750 switches? The switch stack has three 3750-48PS-E switches inter-connected by Cisco StackWise cable. Table 1. 82 MB) PDF - This Chapter (1. Power PSU redundancy mode, total capacity, power reserved (for Sup, fabric modules and fans), and power drawn EOBC (Ethernet Out of Band Channel) Total packets forwarded, transmit rate, dropped packets show hardware capacity <options> BRKDCN-3020 21Compared to the scale and feature richness of the Catalyst 9300 Series switches, Catalyst 9200 Series switches focus on offering right-sized switching for simple branch deploy -. Cisco Catalyst 9300 Series switches support dual redundant power supplies. 6. Booting Cisco Nexus 9000 Series Switches with a Cisco ACI or NX-OS Image 07/Aug/2019. I have been using SNMP to configure our network switchs. Cisco Catalyst 9300 Series Switches Data Sheet. The AC power modules installed in RPS 2300 are not the same type. The Cisco Nexus 2300 platform is built for nonstop operation with redundant hot-swappable power supplies and a hot-swappable fan tray with redundant fans. MIBs. 02 インチ（0. Check Cisco C9300-48P-E price, buy Cisco Switch Catalyst 9300 with best price and fast shipping. Power Cord for 1900W Power Supply for Cat9K (Europe). Does anybody know how to use SNMP to monitor the status of the internal power supplies of a group of stacked Cisco 3750 switches? The switch stack has three 3750-48PS-E switches inter-connected by Cisco StackWise cable. Table7:WeightMeasurementsofSwitches C9300X-12Y-15. C9300L-STACK-KIT. needs 15 watts. 09-27-2021 08:08 PM - edited 09-28-2021 06:04 PM. Maximum output power 1900 W with 230 V: 1500 W with 115 V: 1100 W. Cisco 3850 / 9300 Series AC Power Supply - PWR-C1-350WAC. Figure 1. The largest power supply is removed from the power pool to be used as backup power in case one of the other power supplies fails. 1. 12. Catalyst 9300-M Deployment Best Practices. If only one power supply is installed, it should always be in power supply bay #1. Multiple inputs: Scales the. A 3m (C9300X SKUs) or 50cm (C9300 SKUs) StackWise cable is selected by default for both -E and -A hardware models. 600: %PLATFORM_ENV-6-FRU_PS_OIR: FRU Power Supply 1 powered on This example shows the output of the show env power command:. Network. Step 4. Check PWR-C1-350WAC-P= price and buy Cisco Switch Power Supply 350W AC with best discount. For information about the power supplies. Hi All, Hopefully just a quick question - I'm looking to connect 4 x Cisco Cat9300 in a stack-power ring (no XPS) and I cant find any Cisco documentation that confirms how the ring should be formed, specifically which colour (yellow or green) of the stackpower cable should be connected to which stackpower port on the back of the. Spine-Leaf Architecture using Cisco Nexus 9300 and 9500 Switches Cisco ACI is the most comprehensive solution to enable data center automation and application agility. Power supply options. For detailed specifications of the products in the preceding table, see the Cisco Catalyst IE9300 Rugged Series Switch data sheet. 1 - 1100 watt, the other 715 watt. 3750, 3750G, 3750E,3750X,3750V2, 3850 and I am really hesitant to add. There is no issue if, for example, someone manages to find a power supply with an SKU of C3KX-PWR. PWR-C1-1100WAC-P. Hall of Fame. 7. Provides. Book Title. Troubleshooting TechNotes. 9. The Cisco Catalyst IE9300 Rugged Series Switch supports two hot-swappable, redundant, load-sharing FRU power supplies. 에는 제공된 0. The Cisco® Catalyst® 9300 Series Switches are Cisco’s lead stackable enterprise switching platform built for security, IoT, mobility, and cloud. Product Description Catalyst 9300 24 GE SFP Ports, modular uplink Switch Total 10/100/1000 or Multigigabit copper ports 24x 1G SFP Uplink Configuration Modular Uplinks Default AC power supply 715W AC Available PoE power N/A Dimensions (H x W x D) 1. 5-Year Warranty on all Products! Free Ground Shipping. 0 (UADP 2. Switch#show idprom power-supply 1 Power Supply 1 Idprom : Common Block Signature = 0xABAB Common Block Version = 1 Common Block Length = 144 Common Block Checksum = 5857 Idprom Size = 256 Block Count = 2 FRU Major Type = 0x4501 FRU Minor Type = 1 OEM String = Cisco Systems, Inc. To see which FEXs are supported by the Cisco Nexus 9500 switch I/O modules,. FAN PS-1 is OK. Reply. 0 as available power, As per product documentation this power supply can give 560W only, so I am bit confused. The maximum output power per power supply for the Cisco Catalyst 9300 Series is listed below. Meaning. Total number of MAC addresses. PoE scalability: Support for up to 420 IEEE class 3 (15. Power Supplies The Cisco Catalyst 9300 Series Switches support dual redundant power supplies. Ports. C9300-24H. Cisco Catalyst 9300 Series Switches Hardware Installation Guide. Does it mean power supply has fail OR supply is not inserted properly into slot and not detecting. Installing a Fan Module. The Cisco Catalyst 3850-X series of switches allows you to select network modules (Ethernet or fiber optic) and power supply modules. 3. Aside from OIR bugs (plural), there are numerous bugs relating to PoE, "ghost" ports (nothing is connected to the port but the logs show the port going down/up constantly). 1. 6. 10-23-2017 12:13 PM. PDF - Complete Book (13. Currently I am able to use existing tags from the. Power Supply. Table B-1 lists the power cords for the server power supplies. I am looking at getting some additional power supplies for our C9300 switches and was wondering if the C3KX-PWR-1100WAC model work or do the switches only work with the PWR-C1-1100WAC model. XPS 2200是下一代冗余电源系统，可为多达八台Cisco Catalyst 9300系列交换机提供冗余，并为多达八台9300系列交换机提供Cisco StackPower功能。. Chapter Title. 2. 9800 Rack mount tray . Contact: CISCO Support or nearby CISCO Partner for Help. If I have 1 single power supply in the switch and powered, it's quiet. One of the jobs of the power supplies is to take input AC voltage and convert it into the form needed for internal use by the device (typically low-voltage DC), so the insides of the switch will never know the difference. Power Supply Specifications. Description . STACK-T3-50CM. NXA-PAC-1100W-PE2. Two Crypto Accelerator - Cavium Nitrox III CNN3550-500-C20 . It requires one power supply for system operation, and the second power supplies is optional for redundancy. Router. Book Title. Output power. PDF - Complete Book (13. Log In. Up to 30 watts a port, and up to as much wattage as the two combined power supplies minus about 125 watts for the other functions of the switch. NOTE: The "official" power supply for the Catalyst 9300 is has a SKU prefix of PWR-C1. The XPS 2200 is a standalone power system that can provide backup power to connected devices that experience a power supply failure; or, in a Catalyst switch power stack, it can supply additional power to the power stack budget. Switch 1 FAN 1 is OK. Fast shipping to. See Model Comparison for the Cisco Catalyst 9300 Series Switches. Stackable 24 10/100/1000 Mbps UPOE+ ports; PoE budget of 830 W with 1100 WAC power supply; supports StackWise-480 and StackPower. Cisco Catalyst 9300L unboxing, connecting power supply units, connecting stacking cables, and powering onAmerican Power Conversion (APC) Management Cards. But my requirment is to find the type of power supply provided to that switch like, Whether AC/DC Powersupply and voltage levels and current details. Cisco StackPower. Modular uplinks StackWise® and StackPower cables Platinum-rated power supplies 50CM-1M-3M 30CM-150CM 315W AC 715W AC/DC 1100W AC 1900WAC Modular fan *Roadmap. MIB MIBs Link ; All the supported MIBs for this release. Catalyst-9300#power xps 1 supply A (on|off) <<---- Sets the XPS power supply to be on or off. The Cisco® Power Calculator enables you to calculate the power supply requirements for a specific Power over Ethernet (PoE) configuration. The switches also ship. Either SKU/PID is the same and is. 1. FAN PS-2 is OK. Options like FRU power supplies and fans, modular uplinks, modular patching, perpetual PoE, and the industry’s highest MTBF. In one of my C9300-24UX deployment, I have redundant power supply PWR-C1-1100WAC-P, show power inline output shows 1405. LAN switching. 1. Cisco Catalyst 9300 Series Switches Hardware Installation Guide. 600:. Feature Information . Book Title. 5 VDC or greater. 6. Power Specifications for Platinum Rated AC Power Supplies; Specification. Bias-Free Language. 480 Gbps. Cisco Catalyst 9300 Series Multigigabit switches have introduced. Command Reference, Cisco IOS XE Fuji 16. supplies. PWR-C1-715WAC-P. Note Only the approved power cords or jumper power cords provided with the server are supported. 07-30-2021 09:35 AM. Cisco Catalyst 9300 Series Switches Configure Published On: August 27ᵗʰ, 2019 08:41 Interface and Hardware Components Configuration Guide, Cisco IOS XE Everest. There's no shutdown command, you need to do it old fashion. X (affecting 9300 only). To preserve power for critical IoT endpoints, their respective switch ports can be configured with high priority. no enough power available for another. 12. The switches ship with one power supply by default, and the second power supply can be purchased when the switch is ordered or at a later time. 2 kilowatts (kW). 0223 Search: Search. 8 cm) C9300L-24P-4X. 40 endpoint sessions for ISE. Device# power supply 1 slot A on Jun 10 04:54:39. Even with the fact the 9200 is a 1kW vs the 715W, that much difference in price is crazy. 600: %PLATFORM_ENV-6-FRU_PS_OIR: FRU Power Supply 1 powered on. If power event was unexpected, confirm health of physical power, battery backups, UPS, and so on. Cisco IOS XE Everest 16. The Cisco Nexus 93180YC-FX switch (N9K-C93180YC-FX) is a 1-RU, fixed-port switch designed for Top-of-Rack (TOR), Middle-of-Rack (MoR), and End-of-Rack (EoR) deployment in data centers. In one of my C9300-24UX deployment, I have redundant power supply PWR-C1-1100WAC-P, show power inline output shows 1405. The Cisco Catalyst 9300 UPOE switches that support IEEE 802. Command Reference, Cisco IOS XE Bengaluru 17. Fast shipping and free tech support. 09-12-2020 10:21 PM. 1 m stacking cable for Cisco StackWise-320. Up to 720W of PoE+. I have cisco 9300 48P with 470 Poe watt, connect IeeePD default using 15. Intellgent Power management-Cisco StackPower (5) Optional Power Supply (6) High- Efficiency Power Supply The Accessories Table 2 shows the recommended elements for theC9300-24T-E. It is compatible with the Cisco Catalyst 9300 series switches. See Catalyst 9000 switches. For example, a power supply C3KX-PWR-1100WAC and PWR-C1-1100WAC will work in a Catalyst 9300. Power on the switch. Chapter Title. For information about the power supplies. 3bt standard for Type 4 powered devices are in 802. 0 SSD; Configuring the Switch;. Catalyst 9300 high-performance. C9300L-24P-4G. Buy Smartnet, need to check serial no. Cisco Catalyst 9300 Series Switches. Switch models. 8 cm) The Catalyst 9400 delivers state-of-the-art High Availability (HA) with capabilities like Cisco StackWise ® Virtual technology with In-Service-Software-Upgrade (ISSU), SSO/NSF, uplink resiliency, N+1/N+N redundancy for power supplies. 4. Your network, your way. The default standby slots for this mode are PS5 through PS8. 4. Step 4: Verify that the ethernet cable from the phone to the switch port is good. This bug has been seen on 16. Nexus 9300 1200W AC PS, Port-side Exhaust. Step 5. Nexus 9300 1200W Universal Power Supply, Bi-directional air.