Cisco Model 8653-SU Addressable Transmitter Data Sheet

 

 
 

The Scientific Atlanta

®

 Stretch Tap (SGST) is now part of the 

Surge-Gap

™

 Tap family.  It retains the legacy features of our 

Multimedia Stretch

™

 Tap with the additional benefit of improved 

surge protection.  All Surge-Gap™ taps and passives provide 
IEEE compliant 6 kV surge protection for the device, 
surpassing the industry standard of 1 kV and offering 
significantly improved protection against voltage transients in 
lightning strike areas and locations with unreliable power 
networks. 
 
The Surge-Gap Stretch Tap was specifically designed to minimize costs associated with plant upgrades.  When 
replacing older taps as part of a network upgrade, the existing coaxial feeder cables are often cut back to allow new 
connectors to be installed.  The Surge-Gap Stretch Tap has a nine inch (stretch) housing that fills the extended gap 
between the coaxial cable ends without using costly or performance reducing extension connectors or splices. 
 
The Surge-Gap Stretch Tap has also been designed to allow a variety of plug-in components which add a great 
degree of flexibility to system operators.  The tap value is determined by the value of the directional coupler (DC) 
plug-in.  Additionally, the in/out signal direction through the tap can be reversed simply by reversing the orientation 
of the DC plug-in. 
 
The DC plug-ins are available in three configurations: 

•  The standard DC plug-in is a directional coupler only, which produces insertion losses and tap losses similar to 

those of traditional tap products. 

•  The DC/EQ plug-in has a directional coupler and also incorporates a broadband equalizer (EQ) on the tap leg 

that ties to the ports.  The EQ increases tap loss at lower frequencies - primarily in the reverse path.  The 
increased reverse path tap losses are of particular benefit at lower value tap locations. 

•  The DC/RW (Reverse Window) plug-in has a directional coupler and also incorporates a cable simulator circuit 

that allows lower, as well as more uniform tap losses in the reverse path.  The reduced reverse path tap losses 
are of particular benefit in higher value tap locations. 

By selectively making use of the standard DC, DC/EQ, and DC/RW plug-ins, the total range of reverse path tap 
losses in the HFC plant can be significantly narrowed.  This allows the range of RF levels transmitted from closed 
loop customer premise equipment (CPE) to also be narrowed – thus improving the reliability of upstream 
transmissions. 
 

•  Connection-Beam AC/RF bypass switch, providing interruption-free service to downstream customers during 

faceplate removal 

•  Faceplate-confined circuitry isolates and simplifies maintenance efforts 

•  Per-port power activation and protection, decreasing cost and increasing customer service effectiveness 

•  Nine-inch housing, simplifying system upgrades 

•  Faceplate reversibility, eliminating costly re-splicing 

•  Plug-in directional coupler, enabling field modification without costly resplicing 

•  Available in 2-,4-, and 8-way versions 

•  Compatible with aerial or pedestal mounting 

•  Available space for future enhancements 

•  Durable powder paint coating for superior environmental protection