Ascent Communication Technology

QSFP+ 40G AOC Cable

ASCENT 40G QSFP+ Active Optical Cable is a high-performance integrated cable suitable for high-speed core network and data center applications.

• Full duplex 4 channel 850 nm parallel active optical cable

• Up to 11.1 Gbps data rate per channel

• Maximum link length of 300m links on OM3 multi-mode fiber

• High-reliability 850 nm VCSEL technology

• Electrically hot-pluggable

• < 1.5 W power dissipation per cable end

• QSFP+ MSA compliant

• RoHS compliant

• Case operating temperature range: 0 °C to +70 °C

Absolute Maximum Ratings

Recommended Operating Conditions

General Product Characteristics

Parameter	Value	Notes
Module Form Factor	QSFP+
Number of Lanes	4 Tx /Rx
Maximum Aggregate Data Rate	42.0
Maximum Data Rate per Lane	10.5
Standard Cable Lengths	3, 5, 7, 10, 50, 100	1
Protocols Supported	Typical applications include Infiniband, Fiber Channel, 40G Ethernet
Electrical Interface and Pin‑out	38‑pin edge connector	2
Standard Optical Cable Type	Multi‑mode ribbon fiber cable assembly, riser‑rated
Maximum Power Consumption per End	1.5
Management Interface	Serial, I2C‑based, 400 kHz maximum frequency	3

Notes:

1. Please contact sales for other lengths

2. Pin‑out as defined by the QSFP+ MSA

3. As defined by the QSFP+ MSA

Electrical Characteristics

Parameter	Symbol	Value	Notes
Supply Voltage	Vcc1, VccTx, VccRx	3.14 V to 3.46 V, 3.3 V typical
Supply Current	Icc	450 mA maximum
Transmitter
Differential Data Input Swing	Vin,pp	180 mV to 1000 mV	1
Single Ended Input Voltage tolerance	VinT	‑0.3 V to 4.0 V
Receiver
Differential Data Output Swing	Vout,pp	300 mV to 850 mV	2
Single‑ended Output Voltage		‑0.3 V to +4.0 V

Notes:

1. AC coupled internally. See Figure 1 for input eye mask requirements. Self‑biasing 100 Ω differential input.

2. AC coupled with 100Ω differential output impedance. See Figure 2 for output eye mask.

Figure 1 ‑ Transmitter Input Differential Signal Mask

Figure 2 ‑ Receiver Output Differential Signal Mask

High‑speed Electrical Characteristics per Lane

Parameter‑Inputs	Symbol	Value	Notes
Reference Differential Input Impedance	Zd	100 Ω
Termination Mismatch	ΔZM	5% maximum	1
Input AC Common Mode Voltage		25 mV (RMS) maximum
Differential Input Return Loss	SDD11		2, 0.01 GHz to 4.1 GHz
	SDD11		3, 4.1 GHz to 11.1 GHz
Differential to Common Mode Loss	SCD11	‑10 dB maximum	0.01 GHz to 11.1 GHz
Jitter Tolerance (Total)	TJ	0.40 UI
Jitter Tolerance (Deterministic)	DJ	0.15 UI

Notes:

1. See SFF‑8431 section D.15 Termination Mismatch for definition and test recommendations

2. Reflection coefficient given by equation SDD11 (dB) < ‑12 + 2 * SQRT(f), with f in GHz. See Figure 3.

3. Reflection coefficient given by equation SDD11 (dB) < ‑6.3 + 13Log10(f/5.5), with f in GHz. See Figure 3

Figure 3 ‑ Maximum Transmitter Input and Receiver Output Differential Return Loss

Parameter‑Inputs	Symbol	Value	Notes
Reference Differential Output Impedance	Zd	100 Ω
Termination Mismatch	ΔZM	5 % maximum
Output AC Common Mode Voltage		15 mV (RMS) maximum
Differential Output Return Loss	SDD22		4, 0.01 GHz to 4.1 GHz
	SDD22		5, 4.1 GHz to 11.1 GHz
Common Mode Output Return Loss	SCC22		6, 0.01 GHz to 2.5 GHz
	SCC22	‑3 dB maximum	2.5 GHz to 11.1 GHz
Jitter Tolerance (Total)	TJ
Output Rise and Fall time (20 % to 80 %)	tRH, tFH	24 ps minimum
Deterministic Jitter	DJOUT	0.38 UI	7
Total Jitter	TJOUT	0.64 UI	7