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25G SFP28 Direct Attach Cable

25G SFP28 Direct Attach Cable

25G SFP28 Direct Attach Cable

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 of 25G SFP28 Direct Attach Cable

  • Up to 25.78125Gbps data rate

  • Up to 5m transmission

  • Hot-pluggable SFP 20PIN footprint

  • Compatible to SFP28 MSA

  • Compatible to SFF-8402 and SFF-8432

  • Single 3.3V power supply

  • Temperature Range: 0~ 70 °C

  • RoHS Compliant


Applications of 25G SFP28 Direct Attach Cable

  • Low EMI radiation 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



Specifications of 25G SFP28 Direct Attach Cable

Mechanical Specifications
Ordering Information

Parameter

Minimum

Typical

Maximum

Unit

Cable Diameter (26AWG)

-

0.220

-

Inches

Bend Radius (26AWG)

1.102

-

-

Inches

Cable Diameter (28AWG)

-

0.185

-

Inches

Bend Radius (28AWG)

0.925

-

-

Inches

Cable Diameter (30 AWG)

-

0.181

-

Inches

Bend Radius (30 AWG)

0.906

-

-

Inches

Within Pair Skew

-

-

100

ps/10m

Cable Insertion Loss

-

15.43

-

dB/5m

Bulk Cable Time Delay

-


5.2

ns/m

Bulk Cable Impedance

95

100

105

Ohms

Insertion Force

-

-

40

N

Withdrawal Force

-

-

30

N

Retention Force

90

-

-

N

Durability

50 Cycles

-

-

-


25G SFP28 Copper Cable Assemblies, Passive

P/N

Length

Data Rate

AWG

Length Tolerance

TSSP-PC25G-01M

1M

25G

28 / 30

+3.5/-3.5cm

TSSP-PC25G-02M

2M

25G

28 / 30

+3.5/-3.5cm

TSSP-PC25G-03M

3M

25G

28 / 30

+4/-4cm

TSSP-PC25G-05M

5M

25G

26

+6/-6cm



Recommended Operation Condition of 25G SFP28 Direct Attach Cable

Parameter

Symbol

Min

Max

Unit

Operating Case Temperature

Topc

0

70

degC

Storage Temperature

Tst

-40

85

degC

Relative Humidity (non-condensation)

RS

35

60

%

Supply Voltage

VCC3

3.135

3.465

V

Voltage on LVTTL Input

Vilvttl

-0.3

VCC3  +0.2

V

Power Supply Current

ICC3

-

15

mA

Total Power Consumption

Pd

-

0.05

W

Notes:

Stress or conditions exceed the above range may cause permanent damage to the device.

This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not applied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.


Frequency Domain of 25G SFP28 Direct Attach Cable

Item

Test Parameter

IEEE802.3bj Specification

1

Differential Insertion Loss (SDD12)

Maximum insertion loss at 12.8906Ghz @22.48dB

Minimum insertion loss at 12.8906Ghz@8dB

2

Differential Insertion Loss (SDD21)

Maximum insertion loss at 12.8906Ghz@22.48dB

Minimum insertion loss at 12.8906Ghz@8dB

3

Differential Return Loss (SDD22)

-16.5+2xSQRT(f) @ 0.01 to 4.1GHz

-10.66+14xLog10(f/5.5) @4.1 to 19GHz

4

Differential Return Loss (SDD11)

-16.5+2xSQRT(f) @ 0.01 to 4.1GHz

-10.66+14xLog10(f/5.5) @4.1 to 19GHz

5

Common Mode Reflection (SCC22)

-2dB @ 0.01 to 19GHz

6

Common Mode Reflection (SCC11)

-2dB @ 0.01 to 19GHz

7

Common Mode Conversion (SCD22)

-22+(20/25.78)*(f) @ 0.01 to 12.89GHz

-15+(6/25.78)*(f) @ 12.9 to 19GHz

8

Common Mode Conversion (SCD11)

-22+(20/25.78)*(f) @ 0.01 to 12.89GHz

-15+(6/25.78)*(f) @ 12.9 to 19GHz

9

Differential to Common Mode Conversion Loss (SCD12)

-10dB @ 0.01 to 12.89GHz

-27+(29/22)*(f) @ 12.9 to 15.7GHz

-6.3dB @ 15.71 to 19GHz

10

Differential to Common Mode Conversion Loss (SCD21)

-10dB @ 0.01 to 12.89GHz

-27+(29/22)*(f) @ 12.9 to 15.7GHz

-6.3dB @ 15.71 to 19GHz


Pin definition of 25G SFP28 Direct Attach Cable

Pin

Symbol

Name/Description

1

VEET [1]

Transmitter Ground

2

Tx_FAULT [2]

Not used

3

Tx_DIS   [3]

Not used

4

SDA [2]

2-wire Serial Interface Data Line

5

SCL [2]

2-wire Serial Interface Clock Line

6

MOD_ABS [4]

Module Absent. Grounded within the module

7

RS0 [5]

Not used

8

RX_LOS [2]

Loss of Signal indication. Logic 0 indicates normal operation

9

RS1 [5]

Not used

10

VEER [1]

Receiver Ground

11

VEER [1]

Receiver Ground

12

RD-

Receiver Inverted DATA out. AC Coupled

13

RD+

Receiver DATA out. AC Coupled

14

VEER [1]

Receiver Ground

15

VCCR

Receiver Power Supply

16

VCCT

Transmitter Power Supply

17

VEET [1]

Transmitter Ground

18

TD+

Transmitter DATA in. AC Coupled

19

TD-

Transmitter Inverted DATA in. AC Coupled

20

VEET [1]

Transmitter Ground

Notes:

1.Module circuit ground is isolated from module chassis ground within the module.

2..should be pulled up with 4.7k – 10k ohms on host board to a voltage between 3.15Vand 3.6V.

3.Tx_Disable is an input contact with a 4.7 kΩ to 10 kΩ pullup to VccT inside the module.

4.Mod_ABS is connected to VeeT or VeeR in the SFP+ module. The host may pull this contact up to Vcc_Host with a resistor in the range 4.7 kΩ to10 kΩ.Mod_ABS is asserted “High” when the SFP+ module is physically absent from a host slot.

5. RS0 and RS1 are module inputs and are pulled low to VeeT with > 30 kΩ resistors in the module.

Pin-Descriptions4.jpg


Mechanical Dimensions of 25G SFP28 Direct Attach Cable

The connector is compatible with the SFF-8432 specification.

Mechanical-Dimensions4.jpg


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