On all installations, and particularly on large jobs, two way radios or internal telephone lines should be used to ensure correct numbering of outlets and patch panels during testing.
They checked every known communication media, including ham radio, police walkie-talkies and cellular phones, as alternatives, but all failed to find a static-free connection for such diverse signals.
Instruct people by radio to go into the canteen and stay there and send one operator from North to go there with a radio to do a check of people and stop anyone leaving.
Instruct people by radio to go into the canteen and stay there and send one operator from North to go there with a radio to do a check of people and stop anyone leaving.