GarrettCom Quad 사용자 설명서

Magnum Quad-Series Fiber Switches 

Installation and User Guide (06/03) 

converters mostly do not support auto-negotiation properly, and require that the switched

port to which they are connected be at 100Mb fixed speed.  Attachment to 10/100 auto-

negotiation ports typically will not work properly.  The Quad-Switch’s RJ-45 ports 

 

ection 3.4) 

0Mb 

lly 

highest order mode that both devices can support at that time. (Since auto-

negotiati

f 

When operating in 100Mb half-duplex mode, cable distances and hop-counts 

t collision domain. The Path Delay Value (PDV) bit-times must 

account f

s 

Fast Ethernet switched ports operating at 100Mb half-duplex, the bit time delay is 50BT. 

handle this situation by changing the internal jumper settings.  (see S

When Quad-Switch’s RJ-45 copper ports are set for auto-negotiation and 

connected to an another auto-negotiating device, there are 4 different speed and F/H 

modes selection depending on what the other device supports.  These are: (1) 10

full-duplex, (2) 100Mb half-duplex, (3) 10 Mb full-duplex and (4) 10 Mb half-duplex. 

The auto-negotiation logic will attempt to operate in descending order and will norma

arrive at the 

on is potentially an externally-controlled process, the original “highest order 

mode” result can change at any time depending on network changes that may occur).  I

the device at the other end is not an auto-negotiating device, the Quad-Switch’s RJ-45 

ports will try to detect its idle signal to determine 10 or 100 speed, and will default to 

half-duplex  at that speed per the IEEE standard. 

 

    General information - 

 the devices at both ends of the cable are capable of operation at either 10 

Mb or 100Mb speed and/or in full- or half-duplex mode, and can 

send/receive auto-negotiation pulses, and . . .  

 --   when the second of the two connected devices is powered up*, i.e., 

when LINK is established for a port, or 

--   when LINK is re-established on a port after being lost temporarily. 

• 

NOTE  –  some NIC cards only auto-negotiate when the computer system 

LINK – enabled” rule above, but may be occasionally encountered. 

may be limited within tha

or all devices and cable lengths within that domain. For Magnum Quad-Serie

 

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