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HDT-4611 and HDR-4611 High Definition Optical link

High Defnition Optical link

IRT HDT-4611 and HDR-4611 High Definition TV Fibre Optic Link are transmit and receive modules designed principally for use as a SMPTE292M 1.485 Gb/s serial digital video Fibre Optic transmission link, using 9/125 single mode fibre for path lengths with path attenuation of 22 dB or less. 

This enables the use of space saving fibre optic cable for reliable transmission of digital video signals over lengths greater than can be provided with coaxial cable. 

The High Definition TV Fibre Optic Link transmit / receive system specifications apply to all signal conditions, including the SMPTE 292M pathological test sequence. 

The HDT-4611 High Definition TV Fibre Optic transmitter features an input circuit with automatic cable equalisation for Belden 8281 (or equivalent) coaxial cable followed by a 1300nm LASER transmitter. A monitor output is provided on the rear assembly. 

The HDR-4611 High Definition TV Fibre Optic receiver uses a PIN photodiode detector preamplifier module, signal conditioning and a reclocking circuit for the 1.485 Gb/s data rate, or for 270 Mb/s SDI and ASI signals. 

Two in phase serial digital outputs are provided from the transmission link on the rear assembly. 

On the HDT-4611 High Definition TV Fibre Optic transmitter LED indicators on the front panel indicate the presence of signal, end of cable equaliser range, loss of laser power and presence of DC power. A relay contact output for remote indication will indicate failure of the laser operation. 

On the HDR-4611 High Definition TV Fibre Optic receiver LED indicators on the front panel indicate PLL lock, signal presence and presence of DC power. A relay contact output for remote indication will indicate loss of signal. 

The module comes standard with SC/PC style connectors. 

The HDT-4611 and HDR-4611 High Definition TV Fibre Optic Link are Eurocard modules designed to fit IRT’s standard Eurocard frames as well as IRT’s 4000 series frames for use with IRT’s SNMP system and may be used alongside any other of IRT’s analogue or digital Eurocards. 

Features: 

• Path lengths up to 50 km
• Work reliably
• Passes SMPTE 292M pathological test sequence
• LED indicators
• External alarm contacts
• Fibre, video and alarm connections

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