Ascent’s 400G OSFP product is an OSFP to 2x QSFP56, 400Gb/s to 2 x 200Gb/s Active Optical Breakout Cable (AOC) designed for connecting Mellanox NDR switch with OSFP cage to legacy 2 Mellanox HDR switch/HCA QSFP56 cages. The cable is compliant with SFF-8665 for the QSFP56 pluggable solution. It provides connectivity between system units with a OSFP 400Gb/s connector on one side and two separate QSFP56 200Gb/s connectors on the other side, such as a switch and two servers. The cable connects data signals from each of the 8 MMF (Multi Mode Fiber) pairs on the single OSFP end to the four pairs of each of the QSFP56 multiport ends. It supports 53.125Gb/s per channel. Ascent’s active fiber cable solutions provide power-efficient connectivity for data center interconnects. It enables higher port bandwidth, density and configurability at a low cost, and reduced power requirement in the data centers. four-channel full-duplex active optical cable. The OSFP cable has low power dissipation and 8x50g PAM VCSEL/PIN photo detector. Its operating case temperature is 0°C~70°C.
· Four-Channel full-Duplex active optical cable from OSFP to two QSFP56 cable end
· Supports 53.125Gb/s per channel
· Low Power Dissipation, Max 8W on OSFP end, Max. 4W on QSFP56 end.
· 8x50G PAM4 VCSEL/PIN photo detector
· Operating Case Temperature: 0°C ~70
· Compliant to Class 1M Laser Safety
· OSFP form factor compliance to
n Compliant to OSFP Rev. 5.0
n SFF-8679 electrical interface
n SFF-8661 Pluggable Module
n CMIS Rev. 4.0 Management Interface
n IEEE 802.3cd: Physical Layer Specifications and Management Parameters
· QSFP form factor compliance to
n SFF-8636 Management Interface
n IEEE 802.3cd: Physical Layer Specifications and Management Parameters
Absolute Maximum Parameters
Exceeding the limits below may damage the active optical cable permanently.
Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref |
Maximum Supply Voltage | TCC | -0.5 | 3.6 | °C | ||
Storage Temperature | Vsto | -40 | 85 | °C | ||
Case Operating Temperature | TOP_1 | 0 | 60 | °C | 1、2 | |
Top_2 | 0 | 70 | °C | 2 | ||
Relative Humidity | RH | 5 | 85 | % |
① DDMI temperature reading is measured by the position of Top_1
② Case operating temperature definition:
Top view of module:
Top View of Module
Bottom view of module:
Bottom View of Module
Combination view of module:
Combination View of Module
PARAMETERS
Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref |
Supply Voltage | Vcc | 12 | W | |||
Power Consumption | PCon | 3.63 | A | |||
Bit Rate (PAM4)BR | BR | 26.5625 | GBd | 1 | ||
Bit Rate (NRZ) | BR | 25.78125 | Gbps | |||
Pre-FEC Bit Error Ratio (PAM4) | BER | 2.4x10-4 | 2 | |||
Post-FEC Bit Error Ratio (PAM4) | BER | 10-12 | ||||
Pre-FEC Bit Error Ratio (NRZ) | BER | 5x10-5 | ||||
Post-FEC Bit Error Ratio (NRZ) | BER | 10-12 | ||||
Center Wavelength | λc | 840 | 868 | nm | 3 | |
Beam Divergence Angle | 23 | ° | ||||
Number of Lanes | ||||||
Management Interface | Serial, I2C-based, maximum frequency 400 kHz | 4 | ||||
Logic Input Voltage High | Vih | 2 | Vcc+0.3 | V | ||
Logic Input Voltage Low | Vil | -0.3 | 0.8 | V |
① Single lane
② PRBS31Q test pattern is used.
③ As defined by IEEE Std. 802.3bs ™/D3.5
④ As defined by SFF-8636
Electrical Characteristics for OSFP
Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref |
Transmitter at TP1a | ||||||
AC Common-Mode Output Voltage (RMS) | 17.5 | mV | ||||
Differential Peak-to-Peak Output Voltage (Transmitter Disabled) | 35 | mV | ||||
Differential Peak-to-Peak Output Voltage (Transmitter Enabled) | 880 | mV | ||||
Eye Symmetry Mask Width | ESMW | 0.22 | UI | |||
Eye Height, Differential | EH | 32 | mV | |||
Differential Output Return Loss | See Eq. 1 | |||||
Common to Differential Mode Conversion Return Loss | See Eq. 2 | |||||
Differential Termination Mismatch | 10 | % | ||||
Transition Time (20% To 80%) | Tr, Tf | 10 | ps | |||
Receiver At TP4 | ||||||
Far-End Eye height, Differential | 30 | |||||
Far-End Pre-Cursor ISI Ratio | -4.5 | 2.5 | % | |||
Differential Output Return Loss | λ | See Eq. 1 | ||||
Common to Differential Mode Conversion Return Loss | See Eq. 2 | |||||
Differential Termination Mismatch | 10 | % | ||||
Transition Time (20% To 80%) | Tr, Tf | 10 | ps | |||
DC Common Mode Voltage | -350 | 2850 | mV |
where
f is the frequency in GHz, RLdc is the CAUI-4 Chip-to-module input differential to common mode input return loss
where
f is the frequency in GHz, RLdc is the CAUI-4 Chip-to-module input differential to common mode input return loss
Electrical Characteristics for QSFP
Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref |
Transmitter at TP1a | ||||||
AC Common-Mode Output Voltage (RMS) | 17.5 | mV | ||||
Differential Peak-to-Peak Output Voltage (Transmitter Disabled) | 35 | mV | ||||
Differential Peak-to-Peak Output Voltage (Transmitter Enabled) | 880 | mV | ||||
Eye Symmetry Mask Width | ESMW | 0.22 | UI | |||
Eye Height, Differential | EH | 32 | mV | |||
Differential Output Return Loss | See Eq. 1 | |||||
Common to Differential Mode Conversion Return Loss | See Eq. 2 | |||||
Differential Termination Mismatch | 10 | % | ||||
Transition Time (20% To 80%) | Tr, Tf | 10 | ps | |||
Receiver At TP4 | ||||||
Far-End Eye height, Differential | 30 | |||||
Far-End Pre-Cursor ISI Ratio | -4.5 | 2.5 | % | |||
Differential Output Return Loss | λ | See Eq. 1 | ||||
Common to Differential Mode Conversion Return Loss | See Eq. 2 | |||||
Differential Termination Mismatch | 10 | % | ||||
Transition Time (20% To 80%) | Tr, Tf | 10 | ps | |||
DC Common Mode Voltage | -350 | 2850 | mV |
where
f is the frequency in GHz, RLdc is the CAUI-4 Chip-to-module input differential to common mode input return loss
where
f is the frequency in GHz, RLdc is the CAUI-4 Chip-to-module input differential to common mode input return loss
General Product Characteristics
Parameter | Value | Unit | Comments |
Module Form Factor | OSFP and QSFP | Module Form Factor | |
Number Of Lanes | 8 TX and 8 RX | ||
Maximum Aggregate Data Rate | 425(OSFP) 212.5(QSFP) | Gb/s | |
Maximum Data Rate Per Lane | 53.125 | Gb/s | |
Standard Cable Lengths | 3, 5, 7,10, 15, 20 | m | Other lengths may be available upon request |
Protocols Supported | InfiniBand, Ethernet | ||
Electrical Interface And Pinout | 60-pin edge connector (OSFP) 38-pin edge connector (QSFP56) | Pin-out as defined by OSFP Rev. 5.0 & QSFP SFF8679 | |
Standard Optical Cable Type | Multimode OM3(≤70m) Multimode OM4(<100m) | ||
Maximum Power Consumption Per End | 8 (OSFP) and 4 (QSFP56) | W | Varies with output voltage swing and pre-emphasis settings |
Management Interface | Serial, I2C-based, 400 kHz maximum frequency | As defined by CMIS Rev 4.0 |
The force specification for AOC is in the list below:
Parameter | Min. | Max. | Unit. | Comments. |
Module Insertion | 40 (OSFP) 40 (QSFP56) | N | ||
Module Extraction | 30 (OSFP) 30 (QSFP56) | N | ||
Module Retention | 125 (OSFP) 90 (QSFP56) | N | ||
Insertion And Removal Cycles | 50 | Cycle | ||
Cable Outer Diameter | 2.9 | 3.1 | mm | |
Fiber Cable Material | Aqua, OFNP, Corning fiber |
Pin Desciptions (compliant OSFP Rev. 5.0)
Pin | Symbol | Description | Plug Sequence | |
1 | GND | Ground | 1 | |
2 | TX2p | Transmitter Data Non-Inverted | 3 | |
3 | TX2n | Transmitter Data Inverted | 3 | |
4 | GND | Ground | 1 | |
5 | TX4p | Transmitter Data Non-Inverted | 3 | |
6 | TX4n | Transmitter Data Inverted | 3 | |
7 | GND | Ground | 1 | |
8 | TX6p | Transmitter Data Non-Inverted | 3 | |
9 | TX6n | Transmitter Data Inverted | 3 | |
10 | GND | Ground | 1 | |
11 | TX8p | Transmitter Data Non-Inverted | 3 | |
12 | TX8n | Transmitter Data Inverted | 3 | |
13 | GND | Ground | 1 | |
14 | SCL | 2-wire Serial interface clock | 3 | |
15 | VCC | +3.3V Power supply | 2 | |
16 | VCC | +3.3V Power supply | 2 | |
17 | LPWn/PRSn | Low-Power Mode / Module Present | 3 | |
18 | GND | Ground | 1 | |
19 | RX7n | Receiver Data Inverted | 3 | |
20 | RX7p | Receiver Data Non-Inverted | 3 | |
21 | GND | Ground | 1 | |
22 | RX5n | Receiver Data Inverted | 3 | |
23 | RX5p | Receiver Data Non-Inverted | 3 | |
24 | GND | Ground | 1 | |
25 | RX3n | Receiver Data Inverted | 3 | |
26 | RX3p | Receiver Data Non-Inverted | 3 | |
27 | GND | Ground | 1 | |
28 | RX1n | Receiver Data Inverted | 3 | |
29 | RX1p | Receiver Data Non-Inverted | 3 | |
30 | GND | Ground | 1 | |
31 | GND | Ground | 1 | |
32 | RX2p | Receiver Data Non-Inverted | 3 | |
33 | RX2n | Receiver Data Inverted | 3 | |
34 | GND | Ground | 1 | |
35 | RX4p | Receiver Data Non-Inverted | 3 | |
36 | RX4n | Receiver Data Inverted | 3 | |
37 | GND | Ground | 1 | |
38 | RX6p | Receiver Data Non-Inverted | 3 | |
39 | RX6n | Receiver Data Inverted | 3 | |
40 | GND | Ground | 1 | |
41 | RX8p | Receiver Data Non-Inverted | 3 | |
42 | RX8n | Receiver Data Inverted | 3 | |
43 | GND | Ground | 1 | |
44 | INT/RSTn | Module Interrupt / Module Reset | 3 | |
45 | VCC | +3.3V Power | 2 | |
46 | VCC | +3.3V Power | 2 | |
47 | SDA | 2-wire Serial interface data | 3 | |
48 | GND | Ground | 1 | |
49 | TX7n | Transmitter Data Inverted | 3 | |
50 | TX7p | Transmitter Data Non-Inverted | 3 | |
51 | GND | Ground | 1 | |
52 | TX5n | Transmitter Data Inverted | 3 | |
53 | TX5p | Transmitter Data Non-Inverted | 3 | |
54 | GND | Ground | 1 | |
55 | TX3n | Transmitter Data Inverted | 3 | |
56 | TX3p | Transmitter Data Non-Inverted | 3 | |
57 | GND | Ground | 1 | |
58 | TX1n | Transmitter Data Inverted | 3 | |
59 | TX1p | Transmitter Data Non-Inverted | 3 | |
60 | GND | Ground | 1 | |
Name | Direction | Description | ||
TX[8:1]p | input | Transmit differential pairs from host to module. | ||
TX[8:1]n | input | |||
RX[8:1]p | output | Receiver differential pairs from module to host. | ||
RX[8:1]n | output | |||
SCL | bidir | 2-wire serial clock signal. Requires pull-up resistor to 3.3V on host. | ||
SDA | bidir | 2-wire serial data signal. Requires pull-up resistor to 3.3V on host. | ||
LPWn/PRSn | bidir | Multi-level signal for low power control from host to module and module presence indication from module to host. This signal requires the circuit as described in Section 11.5.3 | ||
INT/RSTn | bidir | Multi-level signal for interrupt request from module to host and reset control from host to module. This signal requires the circuit as described in Section 11.5.2 | ||
VCC | power | 3.3V power for module. | ||
GND | ground | Module Ground. Logic and power return path. |
Mechanical Outline
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