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25G SFP28 Direct Attach Cable (DAC)

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公司名稱上海匯海信息科技股份有限公司
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型號(hào)FGT-25GSFP
所在地上海
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更新時(shí)間2024/11/27 9:39:18
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GeneralDescriptionGeneralDescriptionSFP28DirectAttachCablesarecompliantwithSFF-8432andSFF-8402specifications

25G SFP28 Direct Attach Cable (DAC) 產(chǎn)品信息

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
Differential Return Loss	SDD11 SDD22			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
Differential to common-mode return loss	SCD11 SCD22			See 4	dB	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

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