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Chapter 4 Avaya P460 Layer 2 Features
The Avaya P460 supports auto-negotiation enabling/disabling on a per-port basis.
Flow Control€
Flow Control ensures that the receiving device can handle all the incoming data.
Flow control does this by adjusting the data flow from one device to another. This is
particularly important where the sending device can send data much faster than the
receiving device can receive the data.
There are many flow control mechanisms. One of the most common flow control
protocols for asynchronous communication is called xon-xoff. In this case, the
receiving device sends a an xoff message to the sending device when its buffer is
full. The sending device then stops sending data. When the receiving device is ready
to receive more data, it sends an xon signal.
Flow control can be implemented in hardware or software, or a combination of
both. The P460 uses hardware flow control.
Duplex Mode€
Devices that support full-duplex can transmit and receive data simultaneously.
Half-duplex transmission where each device can only communicate in turn.
Full-duplex provides higher throughput than half-duplex.
The Avaya P460 supports both full duplex and half duplex.
Speed€
The IEEE defines three standard speeds for Ethernet: 10, 100 and 1000 Mbps, also
known as Ethernet, Fast Ethernet and Gigabit Ethernet respectively.
The Avaya P460 supports the following port speeds:
• 10/100 Mbps
• 1000 Mbps
MAC Address€
The MAC address is a unique 48-bit value associated with any network adapter.
MAC addresses are also known as hardware addresses or physical addresses. They
uniquely identify an adapter on a LAN.
MAC addresses are 12-digit hexadecimal numbers (48 bits in length). By
convention, MAC addresses are usually written in one of the following two formats:
• MM:MM:MM:SS:SS:SS
• MM-MM-MM-SS-SS-SS
The first half of a MAC address contains the ID number of the device manufacturer.
An Internet standards body regulates these IDs. The second half of a MAC address
represents the serial number assigned to the device by the manufacturer.
16 Avaya P460 Configuration Guide