Ascent’s QSFP28 passive direct attach copper twinax cable assemblies are high-performance, cost-effective I/O solutions for 100G Ethernet and 100G Fiber Channel applications.
• QSFP28 conforms to Small Form-Factor SFF8665
• 4-channel full-duplex passive copper cable transceiver
• Supports data rates: 25.78 Gb/s (per channel)
• Maximum aggregate data rate: 100Gb/s (4 x 25.78Gb/s)
• IEEE 802.3bj 100GEBASE-CR4
• Copper link x (x=1m, 2m, 3m, 5m)
• Power Supply: +3.3V
• Low crosstalk
• I2C based two-wire serial interface for EEPROM signature which can be customized
• Operating temperature: 0 °C to +70 °C
• Compatible to QSFP28 MSA
• RoHS Compliant
Parameter | Symbol | Min. | Typ. | Max. | Unit |
Storage Temperature | ‑40 | +85 | °C | ||
Operating Case Temperature | Tc | 0 | +70 | °C | |
Power Supply Voltage | VCC3 | 3.14 | 3.3 | 3.47 | V |
Data Rate Per Lane | 1 | 25.78 | Gb/s |
Note: Damage may occur if the transceiver is subjected to conditions beyond the limits.
High Speed Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Differential Impedance | RIN, P | 9 | 100 | 110 | Ω | |
Insertion Loss | SDD2 | 8 | 22.48 | dB | At 12.8906 | |
Differential Return Loss | SDD11 SDD22 | 12.45 | See 1 | dB | At 0.05 to | |
3.12 | See 2 | At 4.1 to 19 | ||||
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 | 12 | See 3 | dB | At 0.01 to | |
10.58 | See 4 | At 12.89 to | ||||
Differential to Common Mode Conversion Loss | SCD21‑IL | 10 | dB | At 0.01 to | ||
See 5 | At 12.89 to | |||||
6.3 | At 15.7 to | |||||
Channel Operating Margin | COM | 3 | dB |
Notes:
1. Reflection Coefficient given by equation SDD11(d B) < 16.5 ‑ 2 × SQRT(f ), with finGHz.
2. Reflection Coefficient given by equation SDD11(dB) < 10.66 ‑ 14 × log10(f/5.5), with finGHz.
3. Reflection Coefficient given by equation SCD11(d B) < 22 ‑ (20/25.78)*f, with finGHz.
4. Reflection Coefficient given by equation SCD11(dB) < 15 ‑ (6/25.78)*f, with finGHz.
5. Reflection Coefficient given by equation SCD21(dB) < 27 ‑ (29/22)*f, with finGHz.
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