PRODDUCTS
Shenzhen JHA Technology Co., Ltd is one of the leading manufacturers of hardened Ethernet, PoE, and fiber connectivity products specifically designed for harsh and demanding environments.
PRODUCTS
25G SFP28 Direct Attach Cable (DAC) JHA-SFP28-25G-PCU
-
- 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
-
Applications
◊ 25G Ethernet
Classification
Network Cabling
DAC(Direct Attach Cable)
- DESCRIPTION
- DIMENSION
- ORDER INFORMATION
- DOWNLOAD
- APPLICATIONS
-
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).
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.
Benefits
◊ Cost-effective copper solution
◊ Lowest total system power solution
◊ Lowest total system EMI solution
◊ Optimized design for Signal Integrity
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
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 -
Applications
◊ 25G Ethernet
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