- Bay Ethernet Switche User Manual

Installing the BayStack Switches
893-01010-A 2-9
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.
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.
100BASE-TX
MDA
1357911
24681012
7466EA
MTX-1
100BASETX
Link
100
F Dx
10/100 Mb/s ports
89301010.BK Page 9 Tuesday, June 10, 1997 8:00 PM