|
The IRT HDT-4611 and HDR-4611
are transmit and receive modules designed principally for use as a
SMPTE292M 1.485 Gb/s serial digital video fibre
optic transmission link, using 9/125µm single mode
fibre for path lengths with path attenuation of 5- 31dB. 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 transmit / receive system specifications apply to all signal conditions, including the SMPTE292M pathalogical test sequence.
The HDT-4611 transmitter features an input circuit with automatic cable equalisation for Belden 8281 (or equivalent) coaxial cable followed by a plug in laser transmitter. A monitor output is provided on the rear assembly.
The HDR-4611 receiver uses a plug in APD 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 transmitter LED indicators on the front panel indicate the presence of signal, loss of laser power and presence of DC power. Relay contact outputs for remote indication will indicate failure of the laser operation, loss of input signal, and loss of power.
On the HDR-4611 receiver LED indicators on the front panel indicate PLL lock at 1.485 Gb/s or 270 Mb/s operation, locked signal presence, optical input failure, and presence of DC power. Relay contact outputs for remote indication will indicate loss of signal, loss of optical input, and loss of power.
An optional SNMP (Simple Network Management
Protocol) plug-in module is available, for each unit,
for remote monitoring when used in conjunction with
IRT's 4000 series frame fitted with SNMP capability.
The HDT-4611 and HDR-4611 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.
|
