Comnet CWGE2FE24MODMS, Installation And Operation Manual

Page: 12 / 84

6
Ethernet Switching Technology
Ethernet Switching Technology dramatically boosted the usable total bandwidth of a
network, eliminated congestion problems inherent with CSMA/CD (Carrier Sense multIP
Address le access with Collision Detection) protocol, and greatly reduced unnecessary
transmission.
This revolutionized networking. First, by allowing two-way simultaneous transmission over
the same port (Full-duplex), it essentially doubled the bandwidth. Second, by reducing the
collision domain to a single switch-port eliminated the need for carrier sensing. Third, by
using the store-and-forward technology’s approach of inspecting each packet to intercept
corrupt or redundant data eliminated unnecessary transmission that slows the network. By
employing Address learning it replaced the inefficient receiving port.
Auto-negotiation regulates the speed and duplex operation of each port, based on the
capability of both devices. Flow-control allows transmission from a 100Mbps node to a
10Mbps node without any loss of data. Auto-negotiation and flow-control may require
disablement for some networking operations involving legacy equipment. Disabling the
auto-negotiation is accomplished by fixing the speed or duplex operation of a port.
Ethernet Switching Technology supplied higher performance at costs lower than other
solutions. Wider bandwidth, no congestion, and the reduction in traffic is why switching is
replacing expensive routers and inefficient hubs as the ultimate networking solution.
Switching brought a whole new way of thinking to networking.