Part Number: QSFP-40G-LR4-S-20-FL QSFP-40G-LR4-S-20-EXT-FL QSFP-40G-LR4-S-20-IND-FL
Form Factor: QSFP
TX Wavelength: 1270nm-1330nm
Reach: 20km
Cable Type: SMF
Rate Category: 40GBase
Interface Type: CWDM-LR4
DDM: Yes
Connector Type: Dual-LC
Optical Power Budget: 9 dB
TX Power Min/Max: -3 to +2.3 dBm
RX Power Min/Max: -12 to +2.3 dBm
Product Features Cisco QSFP-40G-LR4-S-20-FL
Compliant to the IEEE 802.3ba(40GBASE-LR4)
Compliant to the QSFP+ MSA SFF-8436 specification
Up to 20km over SMF
DFBs and PIN monitor photodiodes array for transmitter section
PIN detectors and TIAs array for receiver section
Four 10Gbps CWDM channels in the 1310nm band
I2C interface with integrated Digital Diagnostic Monitoring (DDM)
Utilizes two standard LC optical connector
Operating case temperature:
Standard: 0°C to +70 °C
Extended -5°C to +85 °C
Industrial -40°C to +85 °C
Applications Cisco QSFP-40G-LR4-S-20-FL
Extended 40GBASE‐LR4 Ethernet links
Infiniband QDR and DDR interconnects client‐side
40G Telecom connections
Overview Cisco QSFP-40G-LR4-S-20-FL
The QSFP-40G-LR4-S-20-FL is a transceiver module designed for 20km optical communication applications. The design is compliant to 40GBASE-LR4 of the IEEE P802.3ba standard. The module converts 4 inputs channels of 10Gbps
electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 40Gb/s input into 4 CWDM channels signals, and converts them to 4 channel output electrical data. The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm as members of the CWDM wavelength grid defined in ITU-T G694.2. It contains a duplex LC connector for
the optical interface and a 148-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be used. The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.
Functional Diagram
This product converts the 4-channel 10 Gbps electrical input data into CWDM optical signals (light), by a driven 4- wavelength Distributed Feedback Laser (DFB) array. The light is combined by the MUX parts as a 40 Gbps data, propagating out of the transmitter module from the SMF. The receiver module accepts the 40 Gbps CWDM optical signals input, and de-multiplexes it into 4 individual 10Gbps channels with different wavelengths. Each wavelength is collected by a discrete avalanche photodiode (APD), and then outputted as electric data after amplified first by a TIA and then by a post amplifier. Figure 1 shows the functional block diagram of this product.
A single +3.3V power supply is required to power up this product. Both power supply pins VccTx and VccRx are internally connected and should be applied concurrently. As per MSA specifications the module offers 7 low speed hardware control pins (including the 2-wire serial interface): ModSelL, SCL, SDA, ResetL, LPMode, ModPrsL and IntL.
Module Select (ModSelL) is an input pin. When held low by the host, this product responds to 2-wire serial communication commands. The ModSelL allows the use of this product on a single 2-wire interface bus – individual ModSelL lines must be used.
Laser Driver | DFB Laser | Micro- |
Array (4ch) | Array (4ch) | optics |
Tx3 Tx2 Tx1 Tx0
Rx3 Rx2 Rx1 Rx0
Serial Clock (SCL) and Serial Data (SDA) are required for the 2-wire serial bus communication interface and enable the host to access the QSFP+ memory map.
The ResetL pin enables a complete reset, returning the settings to their default state, when a low level on the ResetL pin is held for longer than the minimum pulse length. During the execution of a reset the host shall disregard all status bits until it indicates a completion of the reset interrupt. The product indicates this by posting an IntL (Interrupt) signal with the Data_Not_Ready bit negated in the memory map. Note that on power up (including hot insertion) the module should post this completion of reset interrupt without requiring a reset.
Low Power Mode (LPMode) pin is used to set the maximum power consumption for the product in order to protect hosts that are not capable of cooling higher power modules, should such modules be accidentally inserted.
Module Present (ModPrsL) is a signal local to the host board which, in the absence of a product, is normally pulled up to the host Vcc. When the product is inserted into the connector, it completes the path to ground though a resistor on the host board and asserts the signal. ModPrsL then indicates its present by setting ModPrsL to a “Low” state.
Interrupt (IntL) is an output pin. “Low” indicates a possible operational fault or a status critical to the host system. The host identifies the source of the interrupt using the 2-wire serial interface. The IntL pin is an open collector output and must be pulled to the Host Vcc voltage on the Host board.
Absolute Maximum Ratings
Parameter | Symbol | Min | Max | Unit |
Storage Temperature | Tst | -40 | +85 | °C |
Relative Humidity (non-condensation) | RH | 5 | 85 | % |
Operating Case Temp (Standard) | Topc | 0 | 70 | °C |
Operating Case Temp (Industrial) | Topc | -40 | 85 | °C |
Recommended Operating Conditions
Parameter | Symbo | l | Min | Typ | Max | Unit |
Power Supply Voltage | Vcc | 3.15 | 3.3 | 3.45 | V | |
Power Supply Current | Icc | 1000 | mA | |||
Power Dissipation | PD | 3.5 | W | |||
Aggregate Bit Rate | BRAVE | 41.25 | Gbps | |||
Lane Bit Rate | BRLANE | 10.3125 | Gbps | |||
Electrical Characteristics – Transmitter
Parameter | Symbol | Min | Typ | Max | Unit | Notes | |
Single ended input voltage tolerance | -0.3 | 4 | V | Referred to TP1 signal common | |||
AC common mode input voltage tolerance | 15 | mV | RMS | ||||
Input Impedance (Differential) | Zin | 85 | 100 | 115 | ohms | Rin > 100 kohms @ DC | |
TX Disable | Disable | VIH | 2 | Vcc+0.3 | V | ||
Enable | VIL | 0 | 0.8 | ||||
TX FAULT | Fault | VOH | 2.4 | Vcc+0.3 | V | ||
Normal | VOL | 0 | 0.8 | ||||
Electrical Characteristics - Receiver
Parameter | Symbol | Min | Typ | Max | Unit | Notes |
Single ended output voltage | -0.3 | 4 | V | Referred to signal common | ||
AC common mode voltage | 7.5 | mV | RMS | |||
Termination mismatch at 1MHz | 5 | % | ||||
Output Impedance (Differential) | Zout | 85 | 100 | 115 | ohms | |
Output Rise/Fall Time | tr/tf | 30 | ps | 10%~90% | ||
LOS | VoH | 2.4 | Vcc+0.3 | V | ||
RX_LOS | ||||||
Normal | VoL | 0 | 0.8 | V |
Optical and Electrical Characteristics
Parameter | Symbol | Min | Typ | Max | Unit |
SMF | L | 20 | km | ||
Aggregate Bit Rate | BRAVE | 41.25 | Gbps | ||
Per Lane Bit Rate | BRLANE | 10.3125 | Gbps |
Optical Characteristics – Transmitter
Parameter | Symbol | Min | Typ | Max | Unit |
Channels wavelength | λC | 1264.5 | 1271 | 1277.5 | nm |
1284.6 | 1291 | 1297.5 | |||
1304.5 | 1311 | 1317.5 | |||
1324.5 | 1331 | 1337.5 | |||
-20dB spectral width | ∆λ | 1 | Nm | ||
Average Launch Power, Each Lane | Pout/lane | -3 | 2.3 | dBm | |
Per Lane Bit Rate | Er | 3.5 | |||
Output Optical Eye | IEEE 802.3ba-2010 Compliant | ||||
Optical Characteristics - Receiver
Parameter | Symbol | Min | Typ | Max | Unit |
Channels wavelength | λC | 1264.5 | 1271 | 1277.5 | nm |
1284.6 | 1291 | 1297.5 | |||
1304.5 | 1311 | 1317.5 | |||
1324.5 | 1331 | 1337.5 | |||
Damage Threshold | 3.3 | dBm | |||
Receiver sensitivity in OMA, each lane | Pmins | -12 | dBm | ||
Maximum Receive Power, each lane | Pmax | 2.3 | dBm | ||
Receiver reflectance | Rr | -26 | Db | ||
LOS De-Assert | LOSD | -11.5 | dBm | ||
LOS Assert | LOSA | -20 | dBm |
PIN Assignment and Function Definitions
PIN Assignment
PIN Definition
PIN | Signal Name | Description |
1 | GND | Ground (1) |
2 | Tx2n | CML-I Transmitter 2 Inverted Data Input |
3 | Tx2p | CML-I Transmitter 2 Non-Inverted Data Input |
4 | GND | Ground (1) |
5 | Tx4n | CML-I Transmitter 4 Inverted Data Input |
6 | Tx4p | CML-I Transmitter 4 Non-Inverted Data Input |
7 | GND | Ground (1) |
8 | ModSelL | LVTLL-I Module Select |
9 | ResetL | LVTLL-I Module Reset |
10 | VCCRx | +3.3V Power Supply Receiver (2) |
11 | SCL | LVCMOS-I/O 2-Wire Serial Interface Clock |
12 | SDA | LVCMOS-I/O 2-Wire Serial Interface Data |
13 | GND | Ground (1) |
14 | Rx3p | CML-O Receiver 3 Non-Inverted Data Output |
15 | Rx3n | CML-O Receiver 3 Inverted Data Output |
16 | GND | Ground (1) |
17 | Rx1p | CML-O Receiver 1 Non-Inverted Data Output |
18 | Rx1n | CML-O Receiver 1 Inverted Data Output |
19 | GND | Ground (1) |
20 | GND | Ground (1) |
21 | Rx2n | CML-O Receiver 2 Inverted Data Output |
22 | Rx2p | CML-O Receiver 2 Non-Inverted Data Output |
23 | GND | Ground (1) |
24 | Rx4n | CML-O Receiver 4 Inverted Data Output |
25 | Rx4p | CML-O Receiver 4 Non-Inverted Data Output |
26 | GND | Ground (1) |
27 | ModPrsL | Module Present |
28 | IntL | Interrupt |
29 | VCCTx | +3.3V Power Supply Transmitter (2) |
30 | VCC1 | +3.3V Power Supply |
31 | LPMode | LVTLL-I Low Power Mode |
32 | GND | Ground (1) |
33 | Tx3p | CML-I Transmitter 3 Non-Inverted Data Input |
34 | Tx3n | CML-I Transmitter 3 Inverted Data Input |
35 | GND | Ground (1) |
36 | Tx1p | CML-I Transmitter 1 Non-Inverted Data Input |
37 | Tx1n | CML-I Transmitter 1 Inverted Data Input |
38 | GND | Ground (1) |
Notes:
All Ground (GND) are common within the QSFP+ module and all module voltages are referenced to this potential unless noted otherwise. Connect these directly to the host board signal common ground plane.
VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and shall be applied concurrently. The connector pins are each rated for a maximum current of 500mA.
Licensing
The following U.S. patents are licensed by Cisco to FluxLight, Inc.:
U.S. Patent Nos: 7,184,668, 7,079,775, 6,957,021, 7,058,310, 6,952,531, 7,162,160, 7,050,720