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With 30 adjustable frames available, you can always have a different and refreshing look. Photo Frame is just as easy to use. Choose a frame, drag & drop your photos in, scale the photo, adjust the size, color, rounded corner and customized background, then save it on your Mac. Main features: - Numerous amazing layouts. Support infinite photos. Quickly and beautifully frame photographs, digital art, Etsy shop listings, family snapshots — any image you can get onto your Mac. Choose from thousands of photorealistic or artistic frames and mats, layered in endless combinations. Add text and image overlays, including watermarks to digitally sign.
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Every Mac comes with one year of hardware repair coverage through its limited warranty and up to 90 days of complimentary technical support. AppleCare+ for Mac extends your coverage to three years from your AppleCare+ purchase date and adds up to two incidents of accidental damage protection every 12 months, each subject to a service fee of $99 for screen damage or external enclosure damage, or $299 for other damage, plus applicable tax.1 In addition, you’ll get 24/7 priority access to Apple experts by chat or phone.2
3 years of Apple-certified service and support coverage
Get up to 2 incidents of accidental damage protection every 12 months1
One stop for support
Because Apple designs the computer, the operating system, and many applications, Mac is a truly integrated system. And only AppleCare+ gives you one-stop service and support from Apple experts, so most issues can be resolved in a single call.
- 24/7 priority access to Apple experts by chat or phone
- Global repair coverage1
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- Carry-in repair3: Take your Mac to an Apple Store or other Apple Authorized Service Provider
Hardware coverage
AppleCare+ for Mac provides global repair coverage, both parts and labor, from Apple-authorized technicians around the world.
Coverage includes the following:
- Your Mac computer
- Battery1
- Included accessories such as the power adapter
- Apple memory (RAM)
- Apple USB SuperDrive
- Up to two incidents of accidental damage protection every 12 months, each subject to a service fee of $99 for screen damage or external enclosure damage, or $299 for other damage, plus applicable tax1
Software support
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Whether you’re sitting in the comfort of your home or office or on the go, you can get direct access to Apple experts for questions on a wide range of topics, including:
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How to buy
- Purchase AppleCare+ with your new Mac.
- Or buy it within 60 days of your Mac purchase:
- Online (requires you to verify your serial number)
- At an Apple Store (inspection of Mac and proof of purchase are required)
- By calling 800-275-2273
AppleCare+ available for:
- MacBook
- MacBook Air
- 13” MacBook Pro
- 15” MacBook Pro
- 16” MacBook Pro
For Mac computers running macOS Server, the plan covers server administration and network management issues using the graphical user interface of macOS Server. For advanced server operation and integration issues, purchase AppleCare OS Support. See AppleCare+ Terms and Conditions for complete product details.
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Apple devices in one app.
Get the Apple Support appPrerequisite – Basics of Wi-fi
MAC layer provides functionality for several tasks like control medium access, can also offer support for roaming, authentication, and power conservation. The basic services provided by MAC are the mandatory asynchronous data service and an optional time-bounded service.
IEEE 802.11 defines two MAC sub-layers :-
MAC layer provides functionality for several tasks like control medium access, can also offer support for roaming, authentication, and power conservation. The basic services provided by MAC are the mandatory asynchronous data service and an optional time-bounded service.
IEEE 802.11 defines two MAC sub-layers :-
- Distributed Coordination Function (DCF) –
DCF uses CSMA/CA as access method as wireless LAN can’t implement CSMA/CD. It only offers asynchronous service. - Point Coordination Function (PCF) –
PCP is implemented on top of DCF and mostly used for time-service transmission. It uses a centralized, contention-free polling access method. It offers both asynchronous and time-bounded service.
MAC Frame:
The MAC layer frame consist of 9 fields. The following figure shows the basic structure of an IEEE 802.11 MAC data frame along with the content of the frame control field.
The MAC layer frame consist of 9 fields. The following figure shows the basic structure of an IEEE 802.11 MAC data frame along with the content of the frame control field.
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- Frame Control(FC) –
It is 2 bytes long field which defines type of frame and some control information. Various fields present in FC are:- Version:
It is a 2 bit long field which indicates the current protocol version which is fixed to be 0 for now. - Type:
It is a 2 bit long field which determines the function of frame i.e management(00), control(01) or data(10). The value 11 is reserved. - Subtype:
It is a 4 bit long field which indicates sub-type of the frame like 0000 for association request, 1000 for beacon. - To DS:
It is a 1 bit long field which when set indicates that destination frame is for DS(distribution system). - From DS:
It is a 1 bit long field which when set indicates frame coming from DS. - More frag (More fragments):
It is 1 bit long field which when set to 1 means frame is followed by other fragments. - Retry:
It is 1 bit long field, if the current frame is a retransmission of an earlier frame, this bit is set to 1. - Power Mgmt (Power management):
It is 1 bit long field which indicates the mode of a station after successful transmission of a frame. Set to 1 the field indicates that the station goes into power-save mode. If the field is set to 0, the station stays active. - More data:
It is 1 bit long field which is used to indicates a receiver that a sender has more data to send than the current frame. This can be used by an access point to indicate to a station in power-save mode that more packets are buffered or it can be used by a station to indicate to an access point after being polled that more polling is necessary as the station has more data ready to transmit. - WEP:
It is 1 bit long field which indicates that the standard security mechanism of 802.11 is applied. - Order:
It is 1 bit long field, if this bit is set to 1 the received frames must be processed in strict order.
- Version:
- Duration/ID –
It is 4 bytes long field which contains the value indicating the period of time in which the medium is occupied(in µs). - Address 1 to 4 –
These are 6 bytes long fields which contain standard IEEE 802 MAC addresses (48 bit each). The meaning of each address depends on the DS bits in the frame control field. - SC (Sequence control) –
It is 16 bits long field which consists of 2 sub-fields, i.e., Sequence number (12 bits) and Fragment number (4 bits). Since acknowledgement mechanism frames may be duplicated hence, a sequence number is used to filter duplicate frames. - Data –
It is a variable length field which contain information specific to individual frames which is transferred transparently from a sender to the receiver(s). - CRC (Cyclic redundancy check) –
It is 4 bytes long field which contains a 32 bit CRC error detection sequence to ensure error free frame.
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