HIGH SPEED INTERCONNECTION
100G QSFP28 Direct Attach Cable (DAC)
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 and InfiniBand EDR
• In accordance with the paging function in the protocol SFF-8636, paging can be selected
00H or 02H in 127 bytes
• 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
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HIGH SPEED INTERCONNECTION
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)
• InfiniBand EDR
• SFF-8665 QSFP+ 28G 4X Pluggable Transceiver Solution(QSFP28)
High Speed Characteristics
Parameter Symbol Min Typical Max Unit Note
Differential Impedance TDR 90 100 110 Ώ
Insertion loss SDD21 -22.48 dB At 12.8906 GHz
See 1 dB At 0.05 to 4.1 GHz
Differential Return Loss SDD11
SDD22 See 2 dB At 4.1 to 19 GHz
Common-mode to common- SCC11
-2 dB At 0.2 to 19 GHz
mode output return loss SCC22
Differential to common-mode SCD11 See 3 At 0.01 to 12.89 GHz
dB
return loss SCD22
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
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
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HIGH SPEED INTERCONNECTION
Pin Descriptions
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
LVCMOS-
SCL
11 I/O 2-wire serial interface clock
LVCMOS-
SDA
12 I/O 2-wire serial interface data
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
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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
Memory Map
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HIGH SPEED INTERCONNECTION
Mechanical Specifications
The connector is compatible with the SFF-8436 specification.
Length (m) Cable AWG
1 30
2 30
3 26/30
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)
FCC Class B
Electromagnetic Compliant with
CENELEC EN55022 Class B
Interference (EMI) Standards
CISPR22 ITE Class B
Typically Show no
Measurable Effect from a
RF Immunity (RFI) IEC61000-4-3
10V/m Field Swept from
80 to 1000MHz
RoHS Directive 2011/65/EU
RoHS Compliance RoHS (EU)2015/863
and it's Amendment
compliant
Directives (EU) 2015/863
REACH Regulation (EC) No
REACH Compliance REACH (EC) No
1907/2006
1907/2006 compliant
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