The TC8116 can also be used to extend telephone lines to remote locations with the Model TC1900 RS-232 or Fiber Telephone Extenders.
Optical redundancy is optional.
Synchronous versions must be RS-232. Because different interfaces can be mixed in 4-Channel increments, a wide variety of interface combinations are available. The built-in test signal generator verifies both device and fiber optic link operation. No other test equipment is required for link and device verification. Electrical connectors are RJ-11.