Magnum 6K32 & 6K32T Managed Switch | Installation and User Guide (12/05) |
4.5Flow-control, IEEE 802.3x standard
Magnum 6K32T Switches incorporate a flow-control mechanism for Full- Duplex mode. The purpose of flow-control is to reduce the risk of data loss if a long burst of activity causes the switch to save frames until its buffer memory is full. This is most likely to occur when data is moving from a 100Mb port to a 10 Mb port and the 10Mb port is unable to keep up. It can also occur when multiple 100Mb ports are attempting to transmit to one 100Mb port, and in other protracted heavy traffic situations.
Magnum 6K32T Switches implement the 802.3x flow control (non-blocking) on Full-Duplex ports, which provides for a “PAUSE” packet to be transmitted to the sender when the packet buffer is nearly filled and there is danger of lost packets. The transmitting device is commanded to stop transmitting into the 6K32T Switch port for sufficient time to let the Switch reduce the buffer space used. When the available free- buffer queue increases, the Switch will send a “RESUME" packet to tell the transmitter to start sending the packets. Of course, the transmitting device must also support the 802.3x flow control standard in order to communicate properly during normal operation. Note: When in Half-Duplex mode, the 6K32T Switch implements a back-pressure algorithm on 10/100 Mb ports for flow control. That is, the switch prevents frames from entering the device by forcing a collision indication on the half-duplex ports that are receiving. This temporary “collision” delay allows the available buffer space to improve as the switch catches up with the traffic flow.
5.0Magnum 6K32T Managed Switch Port Modules
This chapter describes each Port Module (PM), including appearance, functionality, and status displays.
5.1Inspecting the Package and Product
This section applies only to PMs shipped as separate items, i.e., 6K32T PMs not factory installed in a Magnum 6K32T modular slot.
Examine the shipping container for obvious damage prior to installing a 6K32T PM; notify the carrier of any damage you believe occurred during shipment or delivery. Inspect the contents of this package for any signs of damage and ensure that the items listed below are included.
This package should contain:
6K32T PMs
Installation instructions, with illustrations
Remove the 6K32T PM(s) from the shipping container. Be sure to keep the shipping container should you need to ship any of the PMs separately
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