> # TL Ports

> Private loop devices refer to legacy devices that reside on arbitrated loops. These devices are not aware of a switch fabric because they only communicate with devices on the same physical loop. The legacy devices are used in Fibre Channel networks, and devices outside the loop may need to communicate with them. The communication functionality is provided through TL ports. See the "Interface Modes" topic.

> TL port mode is not supported on the following hardware:

> - Generation 2 switching module interfaces
> - Cisco MDS 9124 Fabric Switch
> - Cisco Fabric Switch for HP c-Class BladeSystem
> - Cisco Fabric Switch for IBM BladeCenter

> Table 12-6 lists the TL port translations supported in Cisco MDS 9000 Family switches.

> Table 12-6 Supported TL Port Translations
> Translation from | Translation to | Example
> --- | --- | ---
> Private initiator | Private target | From I1 to T1 or vice versa
> Private initiator | Public target — N port | From I1 to T2 or vice versa
> Private initiator | Public target — NL port | From I4 to T3 or vice versa
> Public initiator — N port | Private target | From I2 to T1 or vice versa
> Public initiator — NL port | Private target | From I3 to T1 or vice versa

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