Specifications

5
Serial-over-LAN
65
Serial-over-LAN
Serial‐over‐LAN(SOL)isthespecificationofpacketformatsandprotocolsfortransmitting
serialdataoveraLANusingIPMI‐over‐LANpack ets.SOLoperationisconceptually
straightforward.AremotemanagementapplicationcanestablishanIPMI‐over‐LAN
sessionwiththeIPMC.Oncethesessionisestablished,theremoteconsolecanrequest
SOLsessionactivation.
TheCOMuxCPLDcontainsthemultiplexerfunctionalityforroutingCOMportsignals.The
COMportselectionisacombinationoftheCOMuxCPLDandBIOSmenuselection.There
isaBIOSbitthatselectstheCOMsnoopandselectionpriorityforCOM1orCOM2(front
orrearports,respectively).Figure 13showstheoverallSOLarchitecture.
Figure 13. Serial-over-LAN – overall architecture
ASOLsessionisestablishedonafirst‐come,first‐servebasisthroughoneoftheBase
EthernetportsorthefrontandrearEthernetports.Ifneitherthefrontnortherearserial
porthasacableconnectedtoit,thenthesystemBIOSconfigurationdetermineswhich
portsgetreadandwriteaccess.Ifcablesareconnectedtoboththefrontandrearports,
theBIOSconfigurationdetermineswhichportisgrantedaccess.Ifonlyonecableis
connected,readaccessisgrantedtothatport.
IftherearenoserialcablesattachedtoeitherthefrontorrearRJ‐45s,andCOM1_GPIOis
setlow,IPMCSOLconnectstotheSuperI/OCOM1.IfCOM1_GPIOissethigh,IPMCSOL
connectstotheSuperI/OCOM2.Inthismode,theIPMCSOLconnectionallowsforboth
RXandTXmodes.Figure 14onpage 66showsthisscenario.
Front
RJ-45
IPMC
Base
Ethernet
Controller
(82576EB)
Super I/O
COM1
COM1
COMux
CPLD
Base
Interface
COM1
I
2
C Bus 4
Front/
Rear
Ethernet
Ports
Front/Rear
Ethernet
Controller
(82576EB)
Rear
RJ-45
COM2
COM2
I/O
Controller
Hub
(ICH10R)
CON_COM1=[0,1]
Network
Selection
Logic
2
SOL is supported through the Base interface or
the Front/Rear ports, but not both simultaneously.
CON_COM1 is set by a BIOS menu selection.
No
cable
No
cable
OR