Ascent Communication Technology

QSFP+ 40G DAC Cable

Ascent’s QSFP+ (Quad Small Form-factor Pluggable Plus) DAC passive cable assemblies are high performance, cost effective I/O solutions for 40G LAN, HPC and SAN applications. QSFP+ copper direct-attach cables are suitable for very short distances and offer a highly cost- effective way to establish a 40-Gigabit link between QSFP+ ports of QSFP+ switches within racks and across adjacent racks. Ascent’s QSFP+ passive copper cables are compliant with SFF-8436, QSFP+ MSA, and IEEE 802.3ba 40GBASE-CR4 They offer a low power consumption, short- reach interconnected applications. The cable each lane is capable of transmitting data at rates up to 10 Gb/s, providing an aggregated rate of 40 Gb/s.

· 4-channel full-duplex passive copper cable transceiver

· Support for multi-gigabit data rates: Up to 10.3 Gb/s per channel

· Maximum aggregate data rate: 41.2 Gb/s

· Wire AWG: 30AWG/26AWG/24AWG

· AC coupling of PECL signals

· All-metal housing for superior EMI performance

· Available lengths (in meters): 1, 3, 5, 7

· Single 3.3 V power supply

· Low power consumption: < 2 W

· High-density QSFP 38-pin connector

· Shielded copper twin axial design for reduced skew rate and cross-talk

· Compliant with QSFP MSA specifications

· Compliant with industry-standard QSFP+ form factor SFF-8436

· Compatible with Cisco, etc

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit	Notes
Storage Temperature	Tst	-40	125	°C
Operating Case Temperature	T_C	-40	85	°C
Relative Humidity (Non-Condensing)	RH	0	85	%
Power Supply Voltage	V_CC3	-0.3	3.6	V
Voltage on LVTTL Input	Vilvttl	-0.3	V_CC3+0.2	V
Data Rate per Lane		1	10.3	Gb/s

Recommended Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit	Notes
Storage Temperature	Tst	-40	125	°C
Operating Case Temperature	TC	-40	85	°C
Relative Humidity (Non-Condensing)	RH	0	85	%
Power Supply Voltage	V_CC3	-0.3	3.6	V
Voltage on LVTTL Input	Vilvttl	-0.3	V_CC3+0.2	V
Data Rate per Lane		1	10.3	Gb/s

Product Characteristics

Parameter	Symbol	Min.	Max.	Unit	Notes
Operating Case Temperature	T_C	-40	85	°C
Relative Humidity (Non-Condensing)	RH	0	85	%
Power Supply Voltage	V_CC3	3.135	3.465	V
Power Supply Current	ICC3	750	-	mA
Total Power Consumption	Pd	-	2.0	W

High Speed Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Differential Impedance	TDR	90	100	110	Ω
Insertion loss	SDD21	-17.04			dB	At 5.15625 GHz
Differential Return Loss	SDD11 SDD22			See 1	dB	At 0.05 GHz to 4.1 GHz
				See 2	dB	At 4.1 GHz to 11.1 GHz
Differential to common-mode return loss	SCD11 SCD22			-10	dB	At 0.2 to 11.1 GHz
Common-mode to common- mode output return loss	SCC11 SCC22	-3			dB	At 0.01 to 11.1 GHz

Notes:
1. Reflection Coefficient given by equation SDD11(dB) < -12 + 2 × SQRT(f), with f in GHz
2. Reflection Coefficient given by equation SDD11(dB) < -6.3 + 13 × log10(f/5.5), with f in GHz