Ascent Communication Technology

400G QSFP DD DAC Cable

The 400G QSFP-DD to QSFP-DD Passive Direct Attach Copper (DAC) Cable is a cost-effective solution for short-range, high-speed data transmission in data centers. With QSFP-DD connectors on both ends, it connects network devices like switches and servers within or between adjacent racks. As a passive cable, it requires no external power, relying on host devices for signal conditioning, ensuring low latency and high reliability. Supporting 400 Gbps through eight 50 Gbps lanes, it complies with IEEE 802.3cd and QSFP-DD MSA standards, delivering excellent signal integrity while reducing crosstalk and electromagnetic interference (EMI). Its robust design suits demanding applications like cloud computing, artificial intelligence, and high-performance networking. The plug-and-play functionality simplifies deployment and reduces downtime. Ideal for short distances, the cable offers significant cost and energy savings by eliminating the need for active optical modules. Available in various lengths, it adapts to diverse setups while meeting strict industry performance standards. The 400G QSFP-DD Passive DAC Cable is a reliable and efficient choice for next-generation network environments.

· Compatible with IEEE 802.3bj and IEEE 802.3cd

· Supports aggregate data rates of 400Gbps(PAM4)

· Optimized construction to minimize insertion loss and cross talk

· Pull-to-release slide latch design

· 28AWG through 30AWG cable

· Straight and break out assembly configurations available

· Customized cable braid termination limits EMI radiation

· Customizable EEPROM mapping for cable signature

· RoHS compliant

High Speed Characteristics

Parameter	Symbol	Min	Typ	Max	Unit	Note
Differential Impedance	TDR	90	100	110	Ώ
Insertion loss	SDD21	-16.06		-8	dB	At 13.28 GHz
Differential Return Loss	SDD11	-12.45		See 1	dB	At 0.05 to 4.1 GHz
	SDD22	-3.12		See 2	dB	At 4.1 to 19 GHz
Common-mode to common-mode output return loss	SCC11 SCC22			-2	dB	At 0.2 to 19 GHz
Common-mode to common-mode output return loss	SCC11 SCC22					At 0.2 to 19 GHz
Differential to common-mode return loss	SCC11	-12		See 3	dB	At 0.01 to 12.89 GHz
Differential to common-mode return loss						At 0.01 to 12.89 GHz
	SCC22	-10.58		See 4	dB	At 12.89 to 19 GHz
Differential to common Mode Conversion Loss	SCD21-IL			-10	dB	At 0.01 to 12.89 GHz
Differential to common Mode Conversion Loss						At 0.01 to 12.89 GHz
				See 5	dB	At 12.89 to 15.7 GHz
				-6.3	dB	At 15.7 to 19 GHz
Channel Operating Margin	COM			-3	dB