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44 VIP-FE-TX/4E Installation and Configuration
VIP Port Adapter Functions
4E Port Adapter
The following sections discuss the 4E port adapter, which is shown in Figure 23.
• Ethernet 10BASE-T Overview
• 4E Port Adapter Description and 10BASE-T Specifications, page 45
• 4E Port Adapter LEDs, page 47
• 4E Port Adapter Receptacles, Cables, and Pinouts, page 47
• Attaching 4E Port Adapter Interface Cables, page 49
• Configuring the 4E Interfaces, page 50
Figure 23 4E Port Adapter, Faceplate View
Ethernet 10BASE-T Overview
The VIP 4E port adapter provides up to four IEEE 802.3 Ethernet 10BASE-T interfaces on the VIP.
Each Ethernet 10BASE-T interface allows a maximum bandwidth of 10-Mbps, for a maximum
aggregate bandwidth of 40 Mbps. All four ports run at line speed.
The term Ethernet is commonly used for all carrier sense multiple access/collision detection
(CSMA/CD) local-area networks (LANs) that generally conform to Ethernet specifications,
including IEEE 802.3. Ethernet Version 2 and IEEE 802.3 were based on, and developed shortly
after, Ethernet Version 1. The slight differences between Ethernet and IEEE 802.3 are implemented
in hardware, and both are supported automatically by the 4E without any hardware configuration
changes. Together, Ethernet and IEEE 802.3 are the most widely used LAN protocols. They are well
suited to applications where a local communication medium must carry sporadic, occasionally
heavy traffic at high peak data rates.
Stations on a CSMA/CD LAN can access the network at any time. Before sending data, the station
listens to the network to see of it is already in use. If it is, the station waits until the network is not
in use, then transmits. A collision occurs when two stations listen for network traffic, hear none, and
transmit simultaneously. When this happens, both transmissions are damaged, and the stations must
retransmit. The stations detect the collision and use backoff algorithms to determine when they
should retransmit.
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