Ricky,
The cable is a standard RJ12, 6 Conductor Cross Wired Modular Telephone cable. They are available in several lengths here on Amazon.
Regarding cable length, consider the following from The DCS Companion 3rd Edition page 68 and The DCS Wifi Companion 1st Edition page 33:
The AIU to TIU cable carries both DCS commands to control the relays and the electrical current to energize them. If only switch terminals are being used, the total AIU cable length can be well over 100 feet, because only one relay is energized at a time. When using accessory terminals, however, many relays may be energized simultaneously causing a greater voltage drop over a long wire run. If so, it's safest to stay under 25 feet of total length between all the AIUs on a chain.
| This and a whole lot more about DCS is all in MTH’s “The DCS Companion 3rd Edition!"
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| This and a whole lot more about DCS WiFi is all in MTH’s “The DCS WiFi Companion 1st Edition!"
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