If your Guide Port RJ-12 cables are not long enough, use this to join two together.
For extension cables see the Guide Port Extension Cable.
Warning About Cables
The use of improperly wired cables with mounts can result in damage
to the electronics in the mount, as well as damage to the interface adapter.
The importance of using a properly wired cable cannot be stressed enough. If
you choose to make or buy your own from another source, please be sure it is
built per the description in the user manual.