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2 – General Description
Fibre Channel Ports
2-6 59042-02 A
2.2.2.2
Translated Loop Port
A TL_Port supports a loop of up to 125 private initiator devices or up to 124
private target devices with the ability to communicate with “off-loop” devices. This
includes public fabric devices and private devices on other TL_Ports. TL_Ports
connect to devices that conform to the Fibre Channel-Private Loop SCSI Direct
Attach (FC-PLDA) standard. Devices connected to TL_Ports are registered with
the Name Server.
A TL_Port acts as a proxy for the off-loop device translating private frames into
and from public frames. Each TL_Port can proxy up to 63 off-loop initiator devices
or up to 64 off-loop target and initiator devices. The set of off-loop devices are
maintained in the TL_Port’s translation entries list.
■ For a TL_Port connected to private target devices, the switch firmware
automatically creates an entry in the translation entries list for each off-loop
initiator device that attempts to establish communication. Soft or VPF zoning
can be used to limit the number of potential initiators to 63. Zone
membership must be done by worldwide name, or domain ID and port ID.
■ For a TL_Port connected to private initiator devices, the switch firmware
automatically creates an entry in the translation entries list for up to 64 target
and initiator devices that are members of the same soft or VPF zone. Zone
membership must be done by worldwide name, or domain ID and port ID.
2.2.2.3
Expansion Port
E_Ports enable you to expand the fabric by connecting SANbox2-8c switches with
other FC-SW-2 compliant switches. SANbox2-8c switches self-discover all
inter-switch connections. Refer to ”Multiple Chassis Fabrics” on page 3-2 for more
information about multiple chassis fabrics.
2.2.3
Logged-In LED
The Logged-in LED indicates the logged-in or initialization status of the connected
devices. After successful completion of the POST, the switch extinguishes all
Logged-In LEDs. Following a successful loop initialization or port log-in, the switch
illuminates the corresponding logged-in LED. This shows that the port is properly
connected and able to communicate with its attached devices. The Logged-In
LED remains illuminated as long as the port is initialized or logged-in. An
Logged-In LED will also illuminate when the port has been designated as a donor
port and its buffer credits are being used by another port. Refer to ”Distance” on
page 3-6 for more information about extended credits and donor ports.
If the port connection is broken or an error occurs that disables the port, the
Logged-In LED will flash. Refer to ”Logged-In LED Indications” on page 5-5 for
more information about the Logged-In LED.