consumption BIDI 1.25G Duplex LC CSFP Optical Transceiver CSFP

The GACC-3512/5312-10D CSFP transceivers are compatible with the Compact Small Form- Factor Pluggable (CSFP) Multi-Source Agreement (MSA) option 2, The transceiver consists of 2-channel Bi-directional Optical Transceiver unit with five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the 1310nm FP laser (the 1550nm DFB laser) and the PIN photo-detector .The module data link up to 10KM in 9/125um single mode fiber.

The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.

Conventional SFP will function when plugged into a C-SFP socket, at the same time no damage to C-SFP and host board if C-SFP module is plugged into a conventional SFP socket

Features 

1250Mbps Typical Data Rate and compliant to 1000Base BX10 IEEE802.3ah

1310nm FP laser transmitter for GACC-3512-10D

1550nm DFB laser transmitter for GACC-5312-10D

PIN photo-detector

Ultra-Low consumption

Up to 10km on 9/125µm SMF

Hot-pluggable CSFP footprint

LC/UPC type pluggable optical interface

Achieve operational compatibility with conventional SFP

Metal enclosure, for lower EMI

RoHS compliant and lead-free

Single +3.3V power supply

Support Digital Diagnostic Monitoring interface

Compliant with SFF-8472

Case operating temperature: Industrial / Commercial optional, 0°C to +70°C

Applications

Gigabit Ethernet(1000BASE-BX10)

Point to Point FTTH Application

Switched Backplane Applications

Router/Server Interface

Switch to Switch Interface

Pin Descriptions

 Note 1: When high, output indicates a laser fault of some kind either in Channel A or Channel B. The Host shall  read Channel A/B for details: TX Fault  from  channel A  if bit 2  is  set  in  [A2H:110]; TX Fault  from channel B if bit 2 is set in [B2H: 110]. Low indicates normal operation. In the low state, the output will be pulled to < 0.8V.

Note 2: When high, this output indicates the received optical power is below the worst-case receiver sensitivity (as defined by the standard in use). Low indicates normal operation. In the low state, the output will be pulled

to < 0.4V.

Note 3: VccT VccR are the power supplies. They are defined as 3.3V ±5% at the SFP connector pin. Maximum supply current is 400Ma@3.3V. Vcc may be internally connected within the SFP transceiver module.

Figure 2: Pin out of Connector Block on Host Board

 Absolute Maximum Ratings

Recommended Operating Conditions

Specification of Transmitter

Note (1): Measure at 2^7-1 NRZ PRBS pattern

Note (2): Transmitter eye mask definition, and eye mask diagram with at least 10% margin.

Specification of Receiver

Note (1): Measured with Light source 1550nm(1310nm), ER=9dB; BER =<10^-12 @PRBS=2^7-1 NRZ

Note (2): When LOS de-asserted, the RX data+/- output is signal output.

Electrical Interface Characteristics

Digital Diagnostic Functions

GACC-3512/5312-10D transceivers support the 2-wire serial communication protocol as defined in the CSFP MSA. It is very closely related to the E2PROM defined in the GBIC standard, with the same electrical specifications.

The standard CSFP serial ID provides access to identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer, and other information.

      Additionally, CSFP transceivers provide a unique enhanced digital diagnostic monitoring interface, which allows real-time access to device operating parameters such as transceiver temperature, laser bias current, transmitted optical power, received optical power and transceiver supply voltage. It also defines a sophisticated system of alarm and warning flags, which alerts end-users when particular operating parameters are outside of a factory set normal range.

The CSFP MSA defines a 256-byte memory map in E2PROM that is accessible over a 2-wire serial interface at the 8 bit address 1010000X (A0h) or 1011000X(B0h). The digital diagnostic monitoring interface makes use of the 8 bit address 1010001X (A2h) or 1011001X(B2h), so the originally defined serial ID memory map remains unchanged. The digital diagnostic memory is defined as follow:

The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. When the serial protocol is activated, the serial clock signal (SCL, Mod Def 1) is generated by the host.  The positive edge clocks data into the SFP transceiver into those segments of the E2PROM that are not write-protected. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and end of serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.

Digital diagnostics for the GACC-3512/5312-10D are internally calibrated by default.

Recommend Circuit Diagram

Outline Dimensions (mm)

Notice

Gigac reserves the right to make changes to or discontinue any optical link product or service identified in this publication, without notice, in order to improve design and/or performance. Applications that are described herein for any of the optical link products are for illustrative purposes only. Gigac makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification.

Revision History