Black Box TL421A RS232 Passive Splitter - RJ45, 4-Port

Serial does not travel far on its own, and the TL421A is Black Box's answer: RJ45, 4-Port. Connectors are Master Port: (1) RJ45 (RS-232).

Power: Non-powered. It measures 0.9-in. H x 2.25-in. W x 4-in. D (2.3 x 5.7 x 10.2-cm).