General Description QSFP28 passive copper cable assembly feature eight differential copper pairs,providing four data transmission channels at speeds up to 28Gbps per channel,and meets 100G Ethernet,25G Ethernet and InfiniBand Enhanced Data Rate(EDR) requirements.Available in a broad rang of wire gages-from 26AWG through 30AWG-this 100G copper cable assembly features low insertion loss and low cross talk. Designed for applications in the data center,networking and telecommunications markets that require a high speed,reliable cable assembly,this next generation product shares the same mating interface with QSFP+ form factor ,making it backward compatible with existing QSFP ports.QSFP28 can be used with current 10G and 14G applications with substantial signal integrity margin. Features and Benefits ◊ Compatible with IEEE 802.3bj,IEEE 802.3by and InfiniBand EDR ◊ Supports aggregate data rates of 100Gbps ◊ Optimized construction to minimize insertion loss and cross talk ◊ Backward compatible with existing QSFP+ connectors and cages ◊ Pull-to-release slide latch design ◊ 26AWG through 30AWG cable ◊ Straight and break out assembly configurations available ◊ Customized cable braid termination limits EMI radiation    ◊ Customizable EEPROM mapping for cable signature ◊ RoHS compliant Product Applications ◊ Switches,servers and routers ◊ Data Center networks ◊ Storage area networks ◊ High performance computing ◊ Telecommunication and wireless infrastructure ◊  Medical diagnostics and networking ◊ Test and measurement equipment Industry Standards ◊ 100G Ethernet(IEEE 802.3bj) ◊ 25G Ethernet(IEEE 802.3by) ◊ InfiniBand EDR ◊ SFF-8665 QSFP+ 28G 4X Pluggable Transceiver Solution(QSFP28) ◊ SFF-8402 SFP+ 1X 28Gb/s Pluggable Transceiver Solution(SFP28) Technical Documents ◊ 108-32081 QSFP28  Copper  Module  Direct  Attach  Cable  Assembly ◊ 108-2364 Single Port and Ganged SFP+ Cages,Zsfp+ Single Port and Ganged Cages,and SFP+  Copper Direct Attach Cable Assemblies. Specification High Speed Characteristics: Parameter Symbol Min Typical Max Unit Note Differential Impedance RIN,P-P 90 100 110 Ώ   Insertion loss SDD21 8   22.48 dB At 12.8906 GHz Differential Return Loss SDD11   12.45   See 1 dB At 0.05 to 4.1 GHz SDD22 3.12   See 2 dB At 4.1 to 19 GHz     Common-mode to SCC11       dB   common-mode 2     At 0.2 to 19 GHz SCC22     output return loss                             Differential to common-mode SCD11   12   See 3 dB   At 0.01 to 12.89 GHz           return loss SCD22 10.58   See 4   At 12.89 to 19 GHz                               10         At 0.01 to 12.89 GHz Differential to common Mode SCD21-IL       See 5 dB   At 12.89 to 15.7 GHz Conversion Loss           6.3         At 15.7 to 19 GHz Channel Operating Margin COM 3     dB   Notes: 1.Reflection Coefficient given by equation SDD11(dB) < 16.5 - 2 × SQRT(f ), with f in GHz 2.Reflection Coefficient given by equation SDD11(dB) < 10.66 - 14 × log10(f/5.5), with f in GHz 3.Reflection Coefficient given by equation SCD11(dB) < 22 - (20/25.78)*f, with f in GHz 4.Reflection Coefficient given by equation SCD11(dB) < 15 - (6/25.78)*f, with f in GHz 5.Reflection Coefficient given by equation SCD21(dB) < 27 - (29/22)*f, with f in GHz Pin Descriptions SFP28 Pin Function Definition: Pin Logic Symbol Name/Description Notes 1   VeeT Transmitter Ground   2 LV-TTL-O TX_Fault N/A 1 3 LV-TTL-I TX_DIS Transmitter Disable 2 4 LV-TTL-I/O SDA Tow Wire Serial Data   5 LV-TTL-I SCL Tow Wire Serial Clock   6   MOD_DEF0 Module present, connect to VeeT   7 LV-TTL-I RS0 N/A 1 8 LV-TTL-O LOS LOS of Signal 2 9 LV-TTL-I RS1 N/A 1 10   VeeR Reciever Ground   11   VeeR Reciever Ground   12 CML-O RD- Reciever Data Inverted   13 CML-O RD+ Reciever Data Non-Inverted   14   VeeR Reciever Ground   15   VccR Reciever Supply 3.3V   16   VccT Transmitter Supply 3.3V   17   VeeT Transmitter Ground     18 CML-I TD+   Transmitter Data Non-Inverted     19 CML_I TD-   Transmitter Data Inverted     20   VeeT   Transmitter Ground   1. Signals not supported in SFP+ Copper pulled-downto VeeT with 30K ohms resistor   2. Passive cable assemblies do not support LOS and TX_DIS   QSFP28 Pin Function Definition Pin Logic Symbol Description 1   GND Ground 2 CML-I Tx2n Transmitter Inverted Data Input 3 CML-I Tx2p Transmitter Non-Inverted Data Input 4   GND Ground 5 CML-I Tx4n Transmitter Inverted Data Input 6 CML-I Tx4p Transmitter Non-Inverted Data Input 7   GND Ground 8 LVTTL-I ModSelL Module Select 9 LVTTL-I ResetL Module Reset 10   Vcc Rx +3.3V Power Supply Receiver 11 LVCMOS- SCL 2-wire serial interface clock I/O       12 LVCMOS- SDA 2-wire serial interface data I/O       13   GND Ground 14 CML-O Rx3p Receiver Non-Inverted Data Output 15 CML-O Rx3n Receiver Inverted Data Output 16   GND Ground 17 CML-O Rx1p Receiver Non-Inverted Data Output 18 CML-O Rx1n Receiver Inverted Data Output 19   GND Ground 20   GND Ground 21 CML-O Rx2n Receiver Inverted Data Output 22 CML-O Rx2p Receiver Non-Inverted Data Output 23   GND Ground 24 CML-O Rx4n Receiver Inverted Data Output 25 CML-O Rx4p Receiver Non-Inverted Data Output 26   GND Ground 27 LVTTL-O ModPrsL Module Present 28 LVTTL-O IntL Interrupt 29   Vcc Tx +3.3V Power supply transmitter 30   Vcc1 +3.3V Power supply 31 LVTTL-I LPMode Low Power Mode 32   GND Ground 33 CML-I Tx3p Transmitter Non-Inverted Data Input 34 CML-I Tx3n Transmitter Inverted Data Input 35   GND Ground 36 CML-I Tx1p Transmitter Non-Inverted Data Input 37 CML-I Tx1n Transmitter Inverted Data Input 38   GND Ground    Mechanical Specifications The connector is compatible with the SFF-8432 and SFF-8665 specification. Length (m) Cable AWG 1 30 2 30 3 26 4 26 5 26 Regulatory Compliance Feature Test Method Performance Electrostatic Discharge (ESD) to the Electrical Pins MIL-STD-883C Method 3015.7 Class 1(>2000 Volts) Electromagnetic Interference(EMI) FCC Class B Compliant with Standards CENELEC EN55022 Class B CISPR22 ITE Class B   RF Immunity(RFI)   IEC61000-4-3 Typically Show no Measurable Effect from a 10V/m Field Swept from 80 to 1000MHz RoHS Compliance RoHS Directive 2011/6/5/EU and it's Amendment Directives 6/6 RoHS 6/6 compliant