S-A Unwraps New Interoperable Transponder


Scientific-Atlanta Inc. has unveiled two technology tweaks that it said will
make life easier for cable-network operators.

First, the Atlanta-based equipment provider introduced a new hybrid
management sublayer-compliant transponder that it said will marry optical nodes
and amplifiers to hybrid fiber-coaxial networks.

The HMS-compliant transponder will allow optical nodes and amplifiers to be
deployed within any HFC network that is managed by a HMS-compliant control

The new transponder is already compliant with S-A's Transmission Network
Control System and the ROSA system developed by its newly acquired European
equipment arm, BarcoNet.

In October, the Society of Cable and Telecommunications Engineers adopted the
first trio of standards for HMS, aimed at creating a group of protocols to allow
differing cable-management systems to interoperate.

In initial SCTE-sponsored interoperability tests, several vendors of HMS
transponders were able to make them work with S-A's management systems,
according to S-A.

S-A also unveiled a new coarse wave-division-multiplexing optical-transport
system that it said will expand the return-path bandwidth for cable plants.

Using new filtering technology, the CWDM system can increase eightfold the
number of light wavelengths an existing strand of fiber can deliver. Expanding
the bandwidth capacity from subscribers back to the main cable plant will speed
the introduction of more interactive services, according to S-A.

Because it uses wide-channel spacing requiring uncooled lasers, it can also
cut operating costs by lowering power consumption.