25Gbps SFP28 Compatible Direct Attach Copper Twinax Passive Cable

（ITEM）

（REQUIREMENT）

（TEST CONDITION）

（Differe ntial Impedan ce）

Cable

Impedance

105+5/-10Ω

Rise time of 25ps (20 % - 80 %).

Paddle Card

Impedance

100±10Ω

Cable Termination

Impedance

100±15Ω

[Differential (Input/Output)Return loss SDD11/SDD22]

16.5-2√f                              0.05≤f﹤4.1

Return_loss(f)≥

10.66-14log10(f/ 5.5)        4.1≤f≤19

Where

f       is the frequency in GHz

Return loss(f)   is the return loss at frequency f

10MHz≤f ≤19GHz

[Differential to common-mode (Input/Output)Return loss SCD11/SCD22]

22-(20/25.78)f     0.01≤f﹤12.89

Return_loss(f)≥

15-(6/25.78)f       12.89≤f≤19

Where

f                        is the frequency in GHz

Return_loss(f)   is the Differential to common-mode return loss at frequency f

10MHz≤f ≤19GHz

[Common-mode to Common-mode (Input/Output)Return

loss SCC11/SCC22]

Return_loss(f)≥2dB                                        0.2≤f≤19 Where

f                        is the frequency in GHz

Return_loss(f) is the common-mode to common-mode return loss at frequency f

10MHz≤f ≤19GHz

[Differential Insertion Loss (S_DD21 Max.)]

(Differential InsertionLoss Max. For TPa to TPb Excluding

Test fixture )

10MHz≤f ≤19GHz

F AWG

1.25GHz

2.5GHz

5.0GHz

7.0GHz

10Ghz

12.89Ghz

30(1m)

4.5dB

5.4dB

6.3dB

7.5dB

8.5dB

10.5dB

Max.

30/28(

3m)Ma x.

7.5dB

9.5dB

12.2dB

14.8dB

18.0dB

21.5dB

26(3m)

Max.

5.7dB

7.2dB

9.9 dB

11.9dB

14.1dB

16.5dB

26/25(

5m)Ma x.

7.8dB

10.0dB

13.5dB

16.0dB

19.0dB

22.0dB

Differential to common-mode Conversion Loss-Differential Insertion

Loss(S_CD21-S_DD21)

10                            0.01≤f﹤12.89

Conversion _loss(f) – IL(f)≥   27-(29/22)f          12.89≤f﹤15.7

6.3                          15.7≤f≤19

Where

f                                 is    the frequency in GHz Conversion_loss(f )    is     the cable assembly differential to common-mode conversion loss

IL(f)                            is    the cable assembly insertion loss

10MHz≤f ≤19GHz

[MDNEXT(multiple disturber

near-end crosstalk)]

≥26dB @12.89GHz

10MHz≤f ≤19GHz

[Intra Skew]

15ps/m,

10MHz≤f ≤19GHz

（ITEM）

（REQUIREMENT）

（TEST CONDITON）

[Low Level Contact Resistance]

70milliohms Max. From initial.

EIA-364-23:Apply a maximum voltage of 20mV

And a current of 100 mA.

Insulation Resistance

10Mohm(Min.)

EIA364-21:AC 300V 1minute

 [Dielectric Withstanding Voltage]

NO disruptive discharge.

EIA-364-20:Apply a voltage of 300 VDC for 1minute between adjacent terminals And between adjacent terminals and

ground.

（ITEM）

（REQUIREMENT）

（TEST CONDITON）

[Operating Temp.

Range]

-20°C to +75°C

Cable operating temperature range.

[Storage Temp.

Range

(in packed condition)]

-40°C to +80°C

Cable storage temperature range in packed condition.

[Thermal Cycling

Non-Powered]

No evidence of physical damage

EIA-364-32D, Method A, -25 to 90C, 100

cycles, 15 min. dwells

[Salt Spraying]

48 hours salt spraying after shell

corrosive area less than 5％.

EIA-364-26

Mixed Flowing Gas

Pass electrical tests per 3.1 after

stressing. (For connector only)

EIA-364-35 Class II,14 days.

Temp. Life

No evidence of physical damage

EIA-364-17C w/ RH, Damp heat 90℃ at

85% RH for 500 hours then return to ambient

Cable Cold Bend

4H,No evidence of physical damage

Condition: -20℃±2℃, mandrel diameter is 6 times the cable diameter.

（ITEM）

（REQUIREMENT）

（TEST CONDITON）

Vibration

Pass electrical tests per 3.1 after stressing.

Clamp & vibrate per EIA-364-28E,

TC-VII, test condition letter – D, 15 minutes in X, Y & Z axis.

Twist

No evidence of physical

Twist cable 180° (±90° from nominal

Twist

damage

position) for 100 cycles at 30 cycles per minute with a 0.5kg load applied to the cable jacket.

Clamp position: 300mm

Cable Flex

No evidence of physical damage

Flex cable 180° for 20 cycles (±90° from nominal position) at 12 cycles per minute with a 1.0kg load applied to the cable jacket. Flex in the boot area 90º in each

direction from vertical. Per EIA-364-41C

Cable Plug Retention in Cage

90N Min.

No evidence of physical damage

Force to be applied axially with no damage to cage. Per SFF 8661 Rev 2.1

Pull on cable jacket approximately 1 ft behind cable plug. No functional damage to cable plug below 90N.

Per SFF-8432 Rev 5.0

Cable Retention in Plug

90N Min.

No evidence of physical damage

Cable plug is fixtured with the bulk cable hanging vertically. A 90N axial load is applied (gradually) to the cable jacket and

held for 1 minute. Per EIA-364-38B

Mechanical Shock

Pass electrical tests

Per 3.1 after stressing.

Clamp and shock per EIA-364-27B, TC-G,3

times in 6 directions, 100g, 6ms.

Cable Plug Insertion

18N Max.(SFP28)

Per SFF-8432 Rev 5.0

Cable plug Extraction

12.5N Max. (SFP28)

Measure without the aid of any cage kick-out springs. Place axial load on

de-latch to de-latch plug. Per SFF-8432

Rev 5.0

Durability

50 cycles,No evidence of physical damage

EIA-364-09, perform plug &unplug cycles:Plug and receptacle mate rate: 250times/hour. 50times for QSFP28/SFP28

module (CONNECTOR TO PCB)