The Prisma II™ optical network is an advanced transmission system designed to optimize network architectures and increase reliability, scalability, and cost effectiveness. The Prisma II Reverse Optical Receivers are available in two form-factors; the original full-height Reverse Data/Video Receiver and the new half-height High Density Dual Reverse Receiver. Each High Density Dual Reverse Receiver (HD-RXR) module contains two independent reverse optical receivers and two RF output ports. Two HD-RXR modules can be vertically stacked in an associated Host Module which occupies a single wide slot in the Prisma II chassis. Up to 26 HD-RXR modules can operate in a standard 6RU chassis*. The ability to mix high density receivers with other Prisma II modules in the same chassis greatly enhances the flexibility of the platform. The HDRXR modules are available in both High Gain and Standard Gain versions. Each Reverse Data Receiver and Reverse Video Receiver module contains two independent optical receivers and two RF output ports. Both of these receiver modules occupy a single wide slot in the Prisma II chassis. *The 56 connector version of the chassis is required to utilize all 4 receivers in one slot.