If the need is for transport testing at all rates up to 10 Gbit/s, then the FTB-810G is the perfect solution.
* SFP port for OC-3/12/48 or STM-1/4/16
* SFP+ port for OC-192 or STM-64
* RJ-48C and bantam ports for DS1 or E1
*BNC port for DS3, E1/E3/E4,
*STS-1e/STS-3e or STM-0e/STM-1e