N-Tron Switch 708M12 User Manual download pdf (Page 15)

Revision 071108

Page 15 of 102

Overview of Advanced Features

Mode of Operation

Each port on the switch can be configured into different modes of operation as shown below:

Copper Ports:

- Half Duplex

- Full Duplex

- Auto Negotiation

Half Duplex

In half duplex mode, the CSMA/CD media access method is the means by which two or more stations share

a common transmission medium. To transmit, a station waits (defers) for a quiet period on the medium (that

is, no other station is transmitting) and then sends the intended message in bit-serial form. If, after initiating

a transmission, the message collides with that of another station, then each transmitting station intentionally

transmits for an additional predefined period to ensure propagation of the collision throughout the system.

The station remains silent for a random amount of time (back-off) before attempting to transmit again.

Full Duplex

Full duplex operation allows simultaneous communication between a pair of stations using point-to-point

media (dedicated channel). Full duplex operation does not require that transmitters defer, nor do they

monitor or react to receive activity, as there is no contention for a shared medium in this mode.

Auto Negotiation

In Auto Negotiation mode, the port / hardware detects the mode of operation of the station that is connected

to this port and sets its mode to match the mode that of the station.

Port Mirroring

A Mirroring Port is a dedicated port that is configured to receive the copies of Ethernet frames that are being

transmitted out and also being received in from any other port that is being monitored.

Port Trunking

Port Trunking is the ability to group two network ports to increase the bandwidth between two machines

(switch or any work station). This feature allows grouping of high-speed connectivity and provides

redundant connection between switches, so that a trunk can act as a single link between the switches.

Priority Tagging (QoS)

IEEE 802.1p priority tagging is supported for two classes of services along with bandwidth support per

priority level. Transparent mode is supported through configuration wherein if the field is set, the tag bits

are ignored. The user can configure up to 8 different priority levels per port. Also priority overriding

(overriding the tagged field) can be enabled or disabled by the user.

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N-Tron Switch 708M12 User Manual Page 15