The Optical Internetworking Forum (OIF) has published a TDM Fabric to Framer Interface Implementation Agreement (IA) intended to allow framer and switch components from multiple vendors to interoperate. Target applications include add/drop multiplexers, TDM cross connect and grooming switches. The IA, known as TFI-5, defines support for key functionality including link integrity monitoring, connection management and mapping mechanisms for both SONET/SDH and non-SONET/SDH clients such as Ethernet and Fiber Channel. The OIF noted that there are...