Ascent Communication Technology

200G QSFP56 PSM4 DAC

Ascent’s QSFP56 passive copper cable assembly feature eight differential copper pairs,providing four data transmission channels at speeds up to 56Gbps(PAM4) per channel,and meets 200G Ethernet and InfiniBand Data Rate(EDR) requirements. Available in a broad rang of wire gages-from 26AWG through 30AWG-this 200G copper cable assembly features low insertion loss and low cross talk. QSFP56 uses PAM4 signals for transmission, which doubles the rate. However, there are more stringent requirements for cable insertion loss. For detailed requirements, please see High Speed Characteristics. Designed for applications in the data center,networking and telecommunications markets that require a high speed,reliable cable assembly,this next generation product shares the same mating interface with QSFP+ form factor ,making it backward compatible with existing QSFP ports.

· Compatible with IEEE 802.3bj and IEEE 802.3cd

· In accordance with the paging function in the protocol SFF-8636, paging can be selected 00H or 02

H in 127 bytes

· Supports aggregate data rates of 200Gbps(PAM4)

· Optimized construction to minimize insertion loss and cross talk

· Backward compatible with existing QSFP+ connectors and cages

· Pull-to-release slide latch design

· 26AWG through 30AWG cable

· Straight and break out assembly configurations available radiation

· 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
Insertion loss	SDD21	-16.06			dB	At 13.28 GHz
Differential Return Loss	SDD11			See 1	dB	At 0.05 to 4.1 GHz
	SDD22			See 2	dB	At 4.1 to 19 GHz
Common-Mode to Common-Mode Output Return Lloss	SCC11 SCC22			-2	dB	At 0.2 to 19 GHz
Common-Mode to Common-Mode Output Return Lloss	SCC11 SCC22
Differential to Common-Mode Return Loss	SCD11			See 3	dB	At 0.01 to 12.89 GHz
Differential to Common-Mode Return Loss	SCD11
	SCD22			See 4		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	SCD21-IL
				See 5		At 12.89 to 15.7 GHz
				-6.3		At 15.7 to 19 GHz