Access Control
What is the connection between Medium Access Control(MAC) and the hardware MAC address?
For example in an ethernet where all hosts share a common broadcast link for each host to have access to the link there is Medium Access Control like the CSMA/CD protocol.
Also any communications hardware device(Computer NIC, bluetooth adaptor, mobile phone, etc) has a “MAC address”. How is this ‘MAC address’ related to the above mentioned Access Control?
They’re not actually related.
The former is a protocol used to detect a carrier on the line, to sense if the line is busy detect collision of data packets. For example, PPP uses CSMA/CD to see when it’s okay to send data or how long to wait after detecting a collision before sending more data.
MAC – stands for Media Access Control. It basically refers to your Ethernet card and the MAC address or hardware address or burnt-in address basically refers to the physical address of the card.
MAC addresses are made up of 6 segments of hexadecimal numbers like A1:B2:C3:D4:E5:F6
The first 3 represent the company (every company that makes cards has their own unique number/s)
The last 3 numbers represent the card’s own unique number.
That way, as long as the company doesn’t make 2 cards with the same last 3 numbers, no 2 cards will ever have the same hardware address.
Unlike IP addresses, MAC addresses are “burnt-in” to the card in the factory and can’t be changed (easily).
Microlatch Biometric Fingerprint Access Control
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Safety Single Door 2 Readers TCP/IP Access Controller $78.34 |
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RFID Door Access Control Keypad Card Reader Controller CK-138 125KHZ EM4100 $13.50 |
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Door Access System Electric Power Supply Controller $36.82 |
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RFID Proximity Door Entry Access Control System ID card $21.99 |
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TCP/IP Communication 2 Door 2 Way Access Controller $104.96 |
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Double Cable Door Access Mount Power Supply Controller $29.69 |
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GSM remote control access controller via SMS 4 OUTPUTS $169.00 |
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Safety 4 Doors 4 Reader 1 Way TCP/IP Access Controller $140.18 |
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Door Access System Electric Power Supply Controller $29.69 |
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Builting 4 Doors 1 Way Control TCP/IP Access Controller $143.33 |
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Security Doorbell 12V Password Keypad Access Controller $25.67 |
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DC 12V 3A Controllers Access LED Enclosure Power Supply $66.81 |
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Single Door Two Way RS232 485 Access Controller System $51.25 |
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RFID Proximity Door Entry Access Control System + Tags $12.79 |
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Single Door Double Way TCP/IP Access Controller New $82.80 |
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Silver Tone Safety Single Door Keypad Access Controller $21.51 |
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New RFID Reader Access Controller System+ 10 ID Cards Not Need To Connect The PC $52.39 |
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New RFID Reader Access Controller System+ 10 ID Cards Not Need To Connect The PC $53.79 |
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Door RFID Proximity Reader Access Control Keypad With 10 ID Cards $35.89 |
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New RFID Reader Access Controller System+ 10 ID Cards Not Need To Connect The PC $51.29 |
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Builting 4 Doors 1 Way Control TCP/IP Access Controller $142.37 |
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TCP/IP Communication 2 Door 2 Way Access Controller $107.38 |
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Fingerprint Access Control Door Lock Staff Time Clock $169.00 |
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Safety DC 12V RS232/485 4 Doors 1 Way Access Controller $96.57 |
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New RIFD Access Control Full Kit -Strike Entry Door Lock System 10 Keyfobs $11.00 |
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Door Access System Electric Power Supply Controller $26.40 |
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RFID Proximity Door Lock Access Control System +10 Keys $7.25 |
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1 Door 2 Way TCP/IP Access Controller Safety System $82.69 |
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Blk Safety Mount Single Door Keypad Access Controller $24.98 |
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HOT TOP 2012 NEW RFID Proximity Door Entry Lock Access Control System #1 $5.15 |
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5S95 IRRIGATION CONTROL VALVE ACCESS COVER, 16-3/8″ X 11″ X 2″ OVERALL $8.00 |
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1 Way 4 Doors TCP/IP Communication Access Controller $140.71 |
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DC 12V 3Amp Uninterruptible Access Control Power Supply $67.99 |
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Security RS232 RS485 2 Door 2 Way Access Controller $67.34 |
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Safety Single Door 2 Readers TCP/IP Access Controller $82.70 |
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Fingerprint + Facial Time Clock and Access Control $429.00 |
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EM Card Single Door Entry Lock Keypad Access Controller $18.96 |
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Door RFID Proximity Reader Access Control Keypad +10 ID RFID Cards $35.89 |
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RS232 RS485 Single Door Double Way Access Controller $52.01 |
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1 Door 2 Way TCP/IP Access Controller Safety System $82.77 |
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Access System DC 12V Output Remote Control Power Supply $76.00 |
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New ID Card Access Control Keypad With10 Free ID Cards Not Need To Connect PC $53.79 |
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Single Door Two Way RS232 485 Access Controller System $51.47 |
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New ID Card Access Control Keypad With10 Free ID Cards Not Need To Connect PC $52.39 |
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100X RFID THIN 125KHz Card for Door Access Control Lock $41.30 |
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