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General Description
General Description
SFP28 Direct Attach Cables are compliant with SFF-8432 and SFF-8402 specifications. Various choices of wire gauge are available from 30 to 26 AWG with various choices of cable length (up to 5m).
Features
? Up to 25.78125 Gbps data rate
? Up to 5 meter transmission
? Hot-pluggable SFP 20PIN footprint
? Improved Pluggable Form Factor(IPF)
compliant for enhanced EMI/EMC
performance
? Compatible to SFP28 MSA
? Compatible to SFF-8402 and SFF-8432
? Temperature Range: 0~ 70 °C
? RoHS Compatible
Benefits
? Cost-effective copper solution
? Lowest total system power solution
? Lowest total system EMI solution
? Optimized design for Signal Integrity
Applications
? 25G Ethernet
Product Description
? The SFP28 passive cable assemblies are high performance, cost effective I/O solutions for 25G Ethernet. SFP28 copper cables allow hardware manufactures to achieve high port density, configurability and utilization at a very low cost and reduced power budget
High Speed Characteristics
Parameter | Symbol | Min | Typical | Max | Unit | Note |
Differential Impedance | TDR | 90 | 100 | 110 | ? | |
Insertion loss | SDD21 | -22.48 | dB | At 12.8906 GHz | ||
Differential Return Loss | SDD11 SDD22 | See 1 | dB | At 0.05 to 4.1 GHz | ||
See 2 | dB | At 4.1 to 19 GHz | ||||
Common-mode to common-mode output return loss | SCC11 SCC22 | -2 | dB | At 0.2 to 19 GHz | ||
Differential to common-mode return loss | SCD11 SCD22 | See 3 | dB | At 0.01 to 12.89 GHz | ||
See 4 | At 12.89 to 19 GHz | |||||
Differential to common Mode Conversion Loss | SCD21-IL | -10 | dB | At 0.01 to 12.89 GHz | ||
See 5 | At 12.89 to 15.7 GHz | |||||
-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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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 | ||||
Mechanical Specifications
The connector is compatible with the SFF-8432 specification.
Length (m) | Cable AWG |
1 | 30 |
2 | 30 |
3 | 30/26 |
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 2011/65/EU and it's Amendment Directives 6/6 | RoHS 6/6 compliant |
