GarrettCom 6K8 User Manual download pdf (Page 52)

Magnum 6K8-Series Industrial Field Switch Installation and User Guide (04/07)

attempting to transmit to one 100Mb port, and in other protracted heavy traffic situations.

Magnum 6K8-Series 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 6K8-Series 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 6K8-Series Switch implements a backpressure

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. The flow control option may

(enable/disable) through setport command of MSN-6K software as per the requirement of

network. By default the Flow control is disabled.

4.5 Power Budget Calculations for Magnum 6K8-Series PM’s with

Fiber Media

Receiver Sensitivity and Transmitter Power are the parameters necessary to

compute the power budget. To calculate the power budget of different fiber media

installations using Magnum products, the following equations should be used:

OPB (Optical Power Budget) = P

(min) - P

(min)

where P

= Transmitter Output Power, and P

= Receiver Sensitivity

Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss)

Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]

where the “Cable Loss” for 62.5/125 and 50/125

m

(Mm) is 2.8 dB/km,

and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km,

and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km

and the “Cable Loss” for 9/125 (Single-mode) is 0.4 dB/km (LXSC25)

and the “Cable Loss” for 9/125 (Single-mode) is 0.25 dB/km

(LXSC40)

and the “Cable Loss” for 9/125 (Single-mode) is 0.2 dB/km (LXSC70)

The following data has been collected from component manufacturer’s (Agilent’s and

Lucent’s) web sites and catalogs to provide guidance to network designers and installers.

www GarrettCom com

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