Q-Logic 16HA Manuel D’Utilisation

its user ports. In this case there is a T_Port for each user port. If a T_Port or CC 
chassis fails, the chassis re-assigns the user port from the failed path to another 
T_Port/CC that is good. 

Note that any IO/T chassis can communicate with any other IO/T chassis with just 
three chassis hops (counting the source and destination chassis).

There are eight user ports remaining on each IO/T chassis. All user ports may be F, 
FL, SL, or TL_Ports.

Any port on an IO/T chassis may be a T_Port. If you are using 2, 3, or 4 T_Ports on 
each chassis, it is best to distribute these T_Ports as evenly as possible between the 
ASIC port groups on each IO/T chassis. That is, don’t bunch the T_Ports up in one 
ASIC port group. See 

 for more information about ASIC port 

groups. Using a port as a T_Port does not affect any other port on the chassis.

If you have individual connectors (one for each fiber), connect the transmit side of 
the T_Port on one chassis to the receive side of the T_Port on the other chassis. 
Connect the receive side of the T_Port on one chassis to the transmit side of the 
T_Port on the other chassis. On the top row of ports on a chassis, the transmit 
connector is the right-hand connector of each pair. On the bottom row of ports on a 
chassis, the transmit connector is the left-hand connector of each pair. Refer to 

 for a drawing showing the transmit and receive 

connectors in a port serviced by a fiber optic GBIC.

Keys on “Duplex” cable assemblies (a connector-pair containing both transmit and 
receive together in one unit), prevent you from connecting them incorrectly. 

HSSDC and DB-9 connectors are duplex cable assemblies. That is, both the 
transmit and receive contacts are part of the same keyed plug assembly. You can’t 
plug them in wrong.

The maximum cable length between chassis depends on the type of interconnec-
tion media and its associated GBICs. Refer to 

for the various types of interconnection media and GBICs.

Cable the user ports to their respective node devices. User ports are all those ports 
on an IO/T chassis that are not used as T_Ports. User ports may be F, FL, SL, or 
TL_Ports. Try to localize the traffic to each chassis as much as possible to 
minimize the amount of traffic across the T_Port links between chassis.