Grass Valley Telethon 3G - Manual (Page 6)

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About Telethon 3G
About the Telethon 3G System
About the Telethon 3G System
The Telethon 3G 8x8 Transceiver is a single optical and electrical multiplexer that combines
up to eight HD/SDI signals and eight optical signals on a pair of Single-Mode Fiber Optic
Cables at distances up to 30km. The system is bidirectional capable of sending and
receiving four HD/SDI signals and four optical signals.
This Telethon 3G is delivered in a single standard model – the Model TN3-GRNP-W8W8 with
4 x 4 HD + 4 x 4 optical over two fibers.
Fig. 1-1: Telethon 3G Front and Rear Panels
A pair of Telethon 3G units (one at each end of the two Fiber Optic cables) accepts electrical
digital signals (via BNC), ranging from 19.4 Mbps up to 3Gbps uncompressed HD/SDI and
optical signals of up to 3Gbps each, and multiplexes them for transmission in both
directions. The CWDM (coarse wavelength division multiplexing) capability of the Telethon
3G system increases the capacity of fiber optic cables and in the case of the Telethon 3G
reduces 16 channels down to two fiber optic cables.
Along with LEDs to indicate the presence of an HD/SDI signal at each BNC input and output,
the Telethon 3G features an integrated optical power meter for monitoring the received
power for each optical HD/SDI signal.
The Telethon 3G also features dual 12-18 VDC power inputs for electrical redundancy.
Each optical channel can support up to 3Gbps. The transceiver handles a wide range of
digital video rates. Supported formats include:
• 3 Gb/s HD/SDI: SMPTE 424M
• 1.5 Gb/s HD/SDI: SMPTE 292M
• 143 Mb/s: SMPTE 259M
• 270 Mb/s DVB/ASI (re-clocked)
• 19.4 Mb/s ATSC: SMPTE 310M
• Non-standard digital signals to 3 Gb/s
The unit is interoperable with industry standard optical HD/SDI signals to/from other
equipment, such as Rattler™, Diamondback™, SHED™, HDX™, and Viper™ series frames and
modules, as well as other manufacturers' routers, DAs, etc.
This examplein Figure 1-2 is just one of many possible uses for the Telethon 3G. It features
a remote location (perhaps an auditorium venue) where a series of devices are combined
together on a single
Telethon 3G unit and transmitted to a Telethon 3G unit at a central
Front Panel
Rear Panel