3com 7600 Benutzerhandbuch
11-2
C
HAPTER
11: E
THERNET
LAN
S
AND
B
RIDGES
IN
THE
7600 C
ARD
Figure 11-1 Ethernet LAN (Ethernet Segment)
Fast Ethernet
Fast Ethernet is a new LAN technology that uses the same CSMA/CD
transmission method as the basic 10 Mbps Ethernet LAN described in the
previous section but all timing parameters are increased by a factor of 10.
In addition, it supports a full duplex mode as described below.
transmission method as the basic 10 Mbps Ethernet LAN described in the
previous section but all timing parameters are increased by a factor of 10.
In addition, it supports a full duplex mode as described below.
Fast Ethernet uses the same types of hub-and-spoke topologies used by
10BASE-T Ethernet, the dominant form of 10 Mpbs networking in use
today. It uses the same types of wiring, the same software protocols and
is supported by a large number of the same vendors. In short, 100BASE-T
provides a non-disruptive, smooth evolution from current 10BASE-T
Ethernet to high-speed 100 Mbps performance.
10BASE-T Ethernet, the dominant form of 10 Mpbs networking in use
today. It uses the same types of wiring, the same software protocols and
is supported by a large number of the same vendors. In short, 100BASE-T
provides a non-disruptive, smooth evolution from current 10BASE-T
Ethernet to high-speed 100 Mbps performance.
The packet format, packet length, error control and management
information in 100BASE-T are practically identical to those in Ethernet. To
higher layers of software, 100BASE-T appears indistinguishable from
regular Ethernet. All the popular protocols like TCP/IP, as well as
applications, work on Fast Ethernet, only faster.
information in 100BASE-T are practically identical to those in Ethernet. To
higher layers of software, 100BASE-T appears indistinguishable from
regular Ethernet. All the popular protocols like TCP/IP, as well as
applications, work on Fast Ethernet, only faster.
Network managers benefit substantially from the unchanged protocols;
they can understand and deploy Fast Ethernet with minimal additional
training.
they can understand and deploy Fast Ethernet with minimal additional
training.
Capabilities
The Fast Ethernet ports of the 7600 Card have the following capabilities:
Q
Auto-negotiation
Q
Full/half duplex transmission mode
abtthgde.book Page 2 Tuesday, June 23, 1998 10:29 AM