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Magnum 500-Series Switching Hubs Installation and User Guide (08/98)
GARRETT
19
Figure 3.5.
Be certain that the main power is off before opening the unit or
changing any internal settings.
Figure 3.5 : Magnum 528’s internal jumpers for auto-negotiation ON or OFF
Note that auto-negotiation is an on-going process that can introduce changes in
network operation at any time, whether intended or accidental. Getting an auto-
negotiating network running properly once is not enough to make certain that it will
continue to operate correctly indefinitely. Attached devices can and do change while the
network is operating. In addition, there may be intermediate devices (such as media
converters, which do not support auto-negotiation) in the cabling between the switched
port and the rest of the network, requiring the switching port to be fixed in speed and
mode in order to achieve and maintain the desired overall network operation.
Therefore, the default setting of fixed 100Mb speed with F/H manual selection
(no auto-negotiation, copper ports) is generally desirable because it is a safe and a
maximum-performance condition for the Model 528’s Fast Ethernet high speed ports.
See Section 4.4 for additional information on auto-negotiation functionality.
4.0 OPERATION
This chapter describes the functions and operation of the Magnum 508, 528
and 528F Switching Hubs.
100
JP3 10
1
= UPLINK X
PORT 1
SW7
100 Mb
SW7
JP3
100
JP4
10
1
JP4
AUTO
100 Mb PORTS
NEGOTIATION
SW2
100 Mb
SW2
Switch Port Function Default setting Manual setting
SW2 Both 100Mb Auto-negotiation 100 Mb (Non-Auto) AUTO
SW7 Port 1 Uplink Uplink = Uplink X
When Non-Auto:
Jumper Port Function Position 1 - 2 Position 2 - 3
JP4 Port 1 10 / 100 config 100 Mb (default) 10 Mb
JP3 Port 2 10 / 100 config 100 Mb (default) 10 Mb