CSFP-OC24-20Axx 1.25Gbps Compact Bi-Di SFP Transceiver, 20km Reach 1310nm TX / 1490 nm RX

Features

•  Support 1.25Gbps data links
•  1310nm FP laser and PIN photodetector for 20km transmission
•  2xBi-directional transceivers in 1 SFP transceiver package
•  Compliant with CSFP MSA Option 2 and SFF-8472
•  Digital Diagnostic Monitoring:
• Internal Calibration or External Calibration
•  Compatible with SONET OC-24 system
•  Compatible with RoHS
•  +3.3V single power supply
•  Operating case temperature:

 0 to +70°C(Commercial)

-40°C to +85°C (Industrial)

Applications

•  SONET OC-24 system
•  Gigabit Ethernet
•  Fiber Channel
•  Switch to Switch interface
•  Point to Point FTTH Application
•  Other optical transmission systems

Description

The CSFP transceivers are high performance, cost effective modules supporting 1.25Gbps and 20km transmission distance with SMF.The transceiver consists of three sections: a FP laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.The transceivers are compatible with Compact SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.

Absolute Maximum Ratings

Table 1 - Absolute Maximum Ratings

Recommended Operating Conditions

Table 2 - Recommended Operating Conditions

Optical and Electrical Characteristics

CSFP-OC24-20Axx:  (FP and PIN, 1310nm, 20km Reach)

Table 3 - Optical and Electrical Characteristics

Notes:

1. The optical power is launched into SMF.

2. PECL input, internally AC-coupled and terminated.

3. Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.

4. Internally AC-coupled.

Timing and Electrical

Table 4 - Timing and Electrical

Diagnostics

Table 5 – Diagnostics Specification

Pin Descriptions

Notes:

Plug Seq.: Pin engagement sequence during hot plugging.

1) TX Fault report transceiver status as following:

TX Fault is an open collector/drain output, which should be pulled up with a 4.7K–10kΩ resistor on the host board. Pull up voltage between 2.0V and VccT, R+0.3V. When high, output indicates a laser fault of some kind either in Channel 1 or Channel 2. The Host shall read Channel 1/2:A2H/AAH: 110 for details: TX Fault from channel 1 if bit 2 is set in [A2H:110]; TX Fault fromchannel 2 if bit 2 is set in [B2H: 110]. Low indicates normal operation. In the low state, the output will be pulled to < 0.8V.

2) TX_disable1, 2 are an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 4.7–10 kΩ resistor. Its states are:

Low (0 – 0.8V):              Transmitter on

(>0.8V, < 2.0V):             Undefined

High (2.0 to 3.465V):         Transmitter Disabled

Open:                      Transmitter Disabled

1. 1,kΩ resistor on the host board. The pull-up voltage shall be VccT or VccR.

Mod-Def 1 is the clock line of two wire serial interface for serial ID

Mod-Def 2 is the data line of two wire serial interface for serial ID

1. 1,2is an open collector output, which should be pulled up with a 4.7k~10kΩ Llsignal; L0 indicates normal operation. In the low state, the output will be pulled to less than

5) RD1,2-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user SERDES.

6) TD1,2-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.

Regulatory Compliance

F-tone Networks SFP transceiver is designed to be Class I Laser safety compliant and is certified per the following standards

Ordering information

Important Notice

Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by F-tone Networks before they become applicable to any particular order or contract. In accordance with the F-tone Networks policy of continuous improvement specifications may change without notice.

The publication of information in this data sheet does not imply freedom from patent or other protective rights of F-tone Networks or others. Further details are available from any F-tone Networks sales representative.