56G QSFP28 DIRECT ATTACH CABLE

QSFP28 Direct Attach Cables are compliant with the SFF-8665 specifications. SFP28 Direct Attach Cables are compliant with SFF-8432 and SFF-8402 specifications. Various choices of wire gauge are available from 30 to 26 AWG with various choices of cable length (up to 5m).

Applications of 56G QSFP28 Direct Attach Cable

Low EMI radiation switches, servers and routers
Data center networks
Storage area networks
High performance computing
Telecommunication and wireless infrastructure
Medical diagnostics and networking
Test and measurement equipment

Specifications of 56G QSFP28 Direct Attach Cable

Parameter	Minimum	Typical	Maximum	Unit
Cable Diameter (26AWG)	–	0.220	–	Inches
Bend Radius (26AWG)	1.102	–	–	Inches
Cable Diameter (28AWG)	–	0.185	–	Inches
Bend Radius (28AWG)	0.925	–	–	Inches
Cable Diameter (30 AWG)	–	0.181	–	Inches
Bend Radius (30 AWG)	0.906	–	–	Inches
Within Pair Skew	–	–	100	ps/10m
Cable Insertion Loss	–	15.43	–	dB/5m
Bulk Cable Time Delay	–	–	5.2	ns/m
Bulk Cable Impedance	95	100	105	Ohms
Insertion Force	–	–	40	N
Withdrawal Force	–	–	30	N
Retention Force	90	–	–	N
Durability	50 Cycles	–	–	–

Data Centers
Infiniband transmission, High-performance computing (HPC) application

Pin Definitions of 56G QSFP+ AOC

Pin	Symbol	Name/Description
1	GND	Ground
2	Tx2n	Transmitter Inverted Data Input
3	Tx2p	Transmitter Non-Inverted Data Input
4	GND	Ground
5	Tx4n	Transmitter Inverted Data Input
6	Tx4p	Transmitter Non-Inverted Data Input
7	GND	Ground
8	ModSelL	Module Select
9	ResetL	Module Reset
10	Vcc Rx	+3.3 V Power supply receiver
11	SCL	2-wire serial interface clock
12	SDA	2-wire serial interface data
13	GND	Ground
14	Rx3p	Receiver Non-Inverted Data Output
15	Rx3n	Receiver Inverted Data Output
16	GND	Ground
17	Rx1p	Receiver Non-Inverted Data Output
18	Rx1n	Receiver Inverted Data Output
19	GND	Ground
20	GND	Ground
21	Rx2n	Receiver Inverted Data Output
22	Rx2p	Receiver Non-Inverted Data Output
23	GND	Ground
24	Rx4n	Receiver Inverted Data Output
25	Rx4p	Receiver Non-Inverted Data Output
26	GND	Ground
27	ModPrsL	Module Present
28	IntL	Interrupt
29	Vcc Tx	+3.3 V Power supply transmitter
30	Vcc1	+3.3 V Power Supply
31	LPMode	Low Power Mode
32	GND	Ground
33	Tx3p	Transmitter Non-Inverted Data Input
34	Tx3n	Transmitter Inverted Data Input
35	GND	Ground
36	Tx1p	Transmitter Non-Inverted Data Input
37	Tx1n	Transmitter Inverted Data Input
38	GND	Ground

P/N	Length	Data Rate	AWG	Length Tolerance
HX-Q28-250-DAC1	1M	56G	28 / 30	+3.5/-3.5cm
HX56-QSFP+-DAC2	2M	56G	28 / 30	+3.5/-3.5cm
HX56-QSFP+-DAC3	3M	56G	28 / 30	+4/-4cm
HX56-QSFP+-DAC4	4M	56G	26	+6/-6cm
HX56-QSFP+-DAC5	5M	56G	26	+6/-6cm