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The DECrepeater 90C is a 7-port 10base2 repeater. Ports 1 through 6 are internally terminated (you don't need a T connector and terminator at the DECrepeater 90C end). Port 0 (on the side or through the DEChub 90 backplane) is not internally terminated so a T connector is required. Ports 1 through 6 are also internally grouted - no other connections to ground are allowed.