Ascent Communication Technology

400G OSFP to 2x200G QSFP56 AOC Breakout Cable

Ascent’s 400G OSFP product is an OSFP to 2x QSFP56, 400Gb/s to 2 x 200Gb/s Active Optical Breakout Cable (AOC) designed for connecting Mellanox NDR switch with OSFP cage to legacy 2 Mellanox HDR switch/HCA QSFP56 cages. The cable is compliant with SFF-8665 for the QSFP56 pluggable solution. It provides connectivity between system units with a OSFP 400Gb/s connector on one side and two separate QSFP56 200Gb/s connectors on the other side, such as a switch and two servers. The cable connects data signals from each of the 8 MMF (Multi Mode Fiber) pairs on the single OSFP end to the four pairs of each of the QSFP56 multiport ends. It supports 53.125Gb/s per channel. Ascent’s active fiber cable solutions provide power-efficient connectivity for data center interconnects. It enables higher port bandwidth, density and configurability at a low cost, and reduced power requirement in the data centers. four-channel full-duplex active optical cable. The OSFP cable has low power dissipation and 8x50g PAM VCSEL/PIN photo detector. Its operating case temperature is 0°C~70°C.

· 400Gb/s to 2x200Gb/s data rate

· Programmable Rx output amplitude and pre-emphasis

· OSFP head end is CMIS 4.0 compliant

· QSFP56 ends are SFF-8665 compliant

· 4.5W Max power consumption for QSFP56 ends

· 14W Max power consumption for the OSFP head end

· Single 3.3V power supply

· Hot pluggable

· RoHS compliant

· SFF-8636 compliant I2C management interface

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit
Operating Case Temperature	Top	0	+70	°C
Storage Temperature Range	Ts	-40	+85	°C
Relative Humidity	RH	0	85	%
Power Supply Voltage	Vcc	-0.5	+3.6	V

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit
Operating Case Temperature Range	Tca	0	/	70	°C
Power Supply Voltage	Vcc	3.135	3.3	3.465	V

Optical Characteristics

This section shows the range of values for normal operation. The host board power supply filtering should be designed as recommended in the SFF Committee Spec.

Parameter	Min.	Typ.	Max.	Unit
Supply Voltage (Vcc)	3.135	3.3	3.465	V
Power Consumption 400Gb/s End	-	4.35	4.5	W
Power Consumption 400Gb/s End	-	13	14	W
Supply Noise Tolerance(10Hz to 10MHz)	66	-	-	mVpp
Operating Case Temperature	0	-	70	°C
Operating Relative Humidity	5	-	85	%

Electrical Characteristics

Parameter (per lane)	Min.	Typ.	Max.	Unit
Signaling Rate	-100 ppm	53.125	+100 ppm	Gbps
Differential Data Input Swing at TP1a	TBD		900	mVpp
Differential Data Output Swing at TP4	-	-	900	mVpp
Near-End ESMW	0.265	-	-	UI
Near-End Output Eye Height	70	-	-	mVpp
Output Transition Time, 20% to 80%	9.5	-	-	ps

Note:

1. Multiple clock domains are supported only on line-side Rx. Host side Rx supports a single clock domain only.

2. QSFP Tx CDR lock can only occur if Tx lane 4 is transmitting data.

Mechanical Characteristics

Parameter (per lane)	Min.		Unit
Diameter	3 +/-0.2		mm
Differential Data Input Swing at TP1a	TBD		mVpp
Length Tolerance	length < 5 m	+300 / -0	mm
Near-End ESMW	5 m ≤ length < 50 m	+500 / -0	mm
Near-End Output Eye Height	50 m ≤ length	+1000 / -0	mm
Cable Color	Aqua		-