Bay Technical Associates 303, 304 Connecting the 10/100BASE-TX Port, 100 Mb/s port connections

Installing the BayStack Switches

Connecting the 10/100BASE-TX Port

Both BayStack 303 and 304 switches contain an onboard 10/100 Mb/s port that uses autonegotiation with the connecting device to determine the wire speed. An optional second 10/100 Mb/s port can be added by installing the 10/100BASE-TX MDA. The 10/100 Mb/s ports must use Category 5 UTP cable to accommodate the 100BASE-TX functionality. A standard RJ-45 connection, shown in

Figure 2-4, is provided to connect devices to the switch through the high-speed port. Like the 10BASE-T ports, the 10/100BASE-TX ports are configured as MDI-X.

Both the onboard port and the optional MDA port have dedicated LEDs that indicate wire speed (10 Mb/s or 100 Mb/s) and duplex mode (half- or full-duplex). See “10/100BASE-TX Port” on page 1-5 and “LEDs” on page 1-7 for more information.

	MDA		1		3	5	7	9	11
MTX-1
	100BASETX	Link	100BASE-TX
		100
		F Dx
				2	4	6	8	10	12

10/100 Mb/s ports

7466EA

Figure 2-4. 10/100 Mb/s port connections

Half-duplex and Full-duplex Mode

By definition, the Ethernet carrier sense multiple access/collision detection (CSMA/CD) protocol operates in half-duplex mode, allowing either data transmission or reception, but never both at the same time. Point-to-point network connections, such as DTE-to-switch ports, do not need CSMA/CD to resolve media access contention from multiple devices; therefore, point-to-point network connections allow a file server to transmit frames to a switch while simultaneously receiving frames from the same switch. This two-way, non-CSMA/CD full-duplex communication provides an effective bandwidth of 200 Mb/s between two devices.

893-01010-A 2-9