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US Cage Code 06324

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GLENAIR, INC.

∙ 1211 AIR WAY ∙ GLENDALE, CA 91201-2497

∙ TEL: 818-247-6000

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PAGE 7 of 16

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050-331 Product Brief

PC Board Mount Dual-Transmitter

3G-SDI and HD-SDI, MMF, 3.3V

TRANSMITTER SECTION

Transmit Disable (TX1_Disable and TX2_Disable)

The transmitters accept a TTL and CMOS compatible transmit disable control signal input that shuts down the transmitter

optical output. A high signal disables the transmitter while a low signal allows normal dual-transmitter operation. Also laser

is disabled when TX Disable is open. In the event of a fault (e.g. eye safety circuit activated), cycling this control signal

resets the module. Host systems should allow a 10ms interval between successive assertions of this control signal.

Transmit Fault (TX1_FAULT and TX2_FAULT)

A catastrophic laser fault will activate the transmitter signal, TX*_FAULT, and disable the laser. This signal is an open

collector output (pull-up required on the host board). A low signal indicates normal laser operation and a high signal

indicates a fault. The TX*_FAULT will be latched high when a laser fault occurs and is cleared by toggling the

TX*_DISABLE input or cycling the power of the dual-transmitter. The transmitter fault condition can also be monitored via

the optional 2-wire serial interface (address A2, byte 110, bit 2).

Eye Safety Circuit

Figure 2

Board Mount Dual-Transmitter Block Diagram