Just posting some found info.
SWM8 SWM-8 AU9/AT9 Satellite Stacker w/ Power Supply - SWM-8
DIRECTV SWM-8 Way Multiswitch Satellite Dish Single Wire Channel Multi-Switch DIRECTV AU9 / AT9 Antenna Stacker Receiver Multi Switch with SWM-PI Power Supply, Part # SWM8: Oak Entertainment Centers and Home Office Furniture, TV Antennas, Audio/Video
http://www.sonoradesign.com/images/Sheet_HRPIR.pdf
The new SWM-8 allows installers to run an AT9 or AU9 DirecTV satellite antenna plus 2 Flex ports (72.5 & 95) down a single RG6 Coaxial cable! At the end of the single wire a STS-2, STS-4, or STS-8 splitter is required (not included) to distribute the signal to as many as 4 DVR's or 8 HD receivers! Please Note: STS series splitters are specially designed for the SWM-8; you must have an STS-2, STS-4, or STS-8. The SWM-8 is ONLY compatible with the HR20 (Firmware .2042), H21, and HR21. It WILL NOT work with older model DIRECTV receivers.
* Provides eight (8) independent channels for supporting up to 8 DIRECTV satellite tuners
* Provides two outputs to serve two customer dwellings (typical)
* Contains a built-in diplexer for combining off-air signals with DIRECTV satellite signals onto a single home-run wire to the dwelling
* Provides AGC for the satellite input signal.
* Die-cast housing is suitable for both indoor and outdoor use.
* Supports six (6) LNB inputs, each triple-band stacked four ports (Ports 1 - 4) cover existing 99/101, 103/110/119 satellites, plus two Flex Ports (95 sat and 72.5 sat)
* Uses only 1 RG6 between SWM-8 and STS Splitter (not included)
* Maximum Distance from SWM8 to Splitter: 200'
* Power Supply Included
Specifications:
* Satellite Input Frequency Range: 250 - 2150Mhz
* Terrestrial & SMATV Input Frequency Range: 54 - 806Mhz
* Return Path Input Frequency Range: 5 - 40 (CMTS return path must use 33-40 MHz band)
* Number of Input Ports: 6 Satellite & 1 Terrestrial /SMATV
* Input Signal Power Level: dBm -45 to -15 dBm per transponder
* Output Frequency Range: MHz 950 - 2150 (Satellite) & 54 - 806 (Terrestrial & SMATV)
* SWM Channel frequencies: MHz 950 - 1800 (Channels 1-9)
* Satellite SWM Module Output Ports: 6 per SWM Module
* Terr/SMATV/Return SWM Module Output Ports: 1 per SWM Module
* Output Signal Power Level dBm -31 dBm (min) per SWM channel
* DC Power: Power Supply (24Vdc, 2.1A)
* Ground Stud: 1
* Operating temperature range: C -34 to +52