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Connect T1 or E1 PBXs, CSUs, or routers over fiber to protect against noise and increase network reliability. Support AMI, B8ZS, and HDB3 line codes. A crossover switch on the RJ-45/RJ-48 port enables easy equipment connections. Extensive diagnostics, including local and remote fiber loopback switches. LEDs display T1/E1 link status, modes of operation, and line segment errors.