©2013 Glenair, Inc.

REV: 2

US Cage Code 06324

Printed in USA

GLENAIR, INC.

∙ 1211 AIR WAY ∙ GLENDALE, CA 91201-2497

∙ TEL: 818-247-6000

∙ FAX: 818-500-9912

www.glenair.com

PAGE 7 of 15

E-mail: sales@glenair.com

050-342 Product Brief

PCB Mount CWDM Transceiver

100 Mbps – 2.5 Gbps, SMF, 3.3V

Eye Safety Circuit

The Transmitter section provides Class 1 eye safety by design and is compliant with US FDA CDRH AEL Class 1 and

EN(IEC) 60825-1,2, EN60950 Class 1. The eye safety circuit continuously monitors optical output power levels and will

disable the transmitter and assert a TX_FAULT signal upon detecting an unsafe condition. Such unsafe conditions can be

created by inputs from the host board (Vcc fluctuation, unbalanced code) or faults within the module.

RECEIVER SECTION

Receiver Loss of Signal (LOS)

The Loss Of Signal (LOS) output indicates an unusable optical input power level. The post-amplification IC includes

transition detection circuitry which monitors the ac level of incoming optical signals and provides a TTL/CMOS compatible

status signal to the host. A low LOS logic level indicates the presence of an optical input while a high LOS logic level

indicates an unusable optical input. The LOS thresholds are factory-set so that a high output indicates a definite optical

fault has occurred (e.g. failed transmitter, broken or disconnected fiber connection to the transceiver, etc.). The LOS can

also be monitored via the 2-wire serial interface (address A2h, byte 110, bit 1).

FUNCTIONAL I/O

The PCB mount transceiver accepts industry standard differential signals such as LVPECL and CML within the scope of

the SFP MSA. To simplify board requirements, transmitter bias resistors and ac coupling capacitors are incorporated, per

SFF-8074i, and hence are not required on the host board. The module is AC-coupled and internally terminated.

Figure 3 illustrates a recommended interface circuit to link the PCB mount transceiver to the supporting Physical Layer

integrated circuits.

The PCB mount transceiver interfaces with the host circuit board through twenty I/O pins identified by function in Table 7.

The transceiver high speed transmit and receive interfaces requires SFP MSA compliant signal lines on the host board.

The Tx_Disable, Tx_Fault, and Rx_LOS lines require TTL lines on the host board (per SFF-8074i) if used. If an

application chooses not to take advantage of the functionality of these pins, TX_Disable need to be tied to GND, TX_Fault

and RX_LOS do not need to be connected.

Digital Diagnostic Interface and Serial Identification (EEPROM)

The PCB mount transceiver is compatible with the SFF-8074i SFP specification and with SFF-8472, the SFP specification

for Digital Diagnostic Monitoring Interface. Both specifications can be found at http://www.sffcommittee.org.