The maximum recommended I/O cable length is 15 m. Cables longer than this may be specified if 

necessary but may suffer from voltage drop, offset, crosstalk and noise and will present materials 

handling problems.  

Internal cables are designed for cables where they are terminated in adjacent enclosures. If the 

cable needs to leave the enclosure environment, the external cable has more protection. Note that 

the ‘external’ cables are not armoured and are not suitable for truly external use and must still be 

treated with care. These cables will need protection when drawn through a cable route, and should 

also not be pulled by the connector(s). They should enter cabinets through transit/compression 

blocks and cannot be glanded. 

The Companion Slot cables described in this document allow hot-swap modules to be sited in 

adjacent slots using a double width chassis socket. For SmartSlot cables, allowing a remote slot to 

be assigned as necessary for a hot-swap, refer to Trusted I/O SmartSlot Cables, publication ICSTT

RM313 (PD-TC500).