400G QSFP-DD to 2×200G QSFP56 Passive Direct Attach Copper Twinax Cable (DAC)

SPECIFICATIONS
Cable End Connector A	QSFP-DD	Cable End Connector B	2×QSFP56
Jumper Type	Active Optical Breakout Cable	Data Rate	400G
Aggregate Bit Rate	400Gbps	Lane Bit Rate	50Gbps
Number of Channels	8	Single Channel Rate	50G
Minimum Bend Radius	5X Cable OD -Single, 10X Cable OD - Repeated	Factory Brand	PHILISUN
Attenuation	28AWG:10dB/7m maximum 30AWG:8.4dB/5.5m maximum	Bit Error Rate	≤10-12
Shield	Braid/Foil	Wire AWG	28AWG/30AWG
Cable Type	Passive Twinax	Cable OD	30AWG: 6.7mm 28AWG: 7.9mm
Cable Colour/Material	Black PVC(OFNR)	Cable Length Selection	0.5-3meter
Protocols	IEEE802.3Bj, By/IEEE802.3CD/QSFP-DD MSA/SFF-8636/SFF-8679	Application Scenarios	400Gigabit Ethernet (400GbE)
Supply Voltage	3.3V	Power Dissipation	<0.1W
Operating Temperature	0 to 70℃ (32 to 158℉)	Storage Temperature	-40 to 85℃ (-40 to 185℉)

PRODUCT PRESENTATION

The PHILISUN 400G QSFP-DD to 2x200G QSFP56 Passive Direct Attach Copper Twinax Cable (DAC) is a flexible Breakout Cable designed for High-Density network segmentation, converting a single 400G port into two 200G QSFP56 channels. It is fully compliant with the QSFP-DD MSA, IEEE 802.3bj, and IEEE 802.3cd standard. This Passive Copper solution offers the lowest power consumption and Low Latency, making it a highly Cost-Effective link for Data Center architectures, supporting scalable Switch to Switch aggregation and high-throughput connections from Switch to GPU systems.

DAC SERIES PRODUCTS

PRODUCTION & TESTING EQUIPMENT

QSFP-DD Pin Define

Pin Designation

Pin	Logic	Symbol	Name/Description	Notes
1	–	GND	Ground	1
2	CML-I	Tx2n	Transmitter Inverted Data Input	–
3	CML-I	Tx2p	Transmitter Non-Inverted Data Input	–
4	–	GND	Ground	1
5	CML-I	Tx4n	Transmitter Inverted Data Input	–
6	CML-I	Tx4p	Transmitter Non-Inverted Data Input	–
7	–	GND	Ground	1
8	LVTTL-I	ModSelL	Module Select	–
9	LVTTL-I	ResetL	Module Reset	–
10	–	VccRx	+3.3V Power Supply Receiver	2
11	LVCMOS-I/O	SCL	2-wire serial interface clock	–
12	LVCMOS-I/O	SDA	2-wire serial interface data	–
13	–	GND	Ground	1
14	CML-O	Rx3p	Receiver Non-Inverted Data Output	–
15	CML-O	Rx3n	Receiver Inverted Data Output	–
16	–	GND	Ground	1
17	CML-O	Rx1p	Receiver Non-Inverted Data Output	–
18	CML-O	Rx1n	Receiver Inverted Data Output	–
19	–	GND	Ground	1
20	–	GND	Ground	1
21	CML-O	Rx2n	Receiver Inverted Data Output	–
22	CML-O	Rx2p	Receiver Non-Inverted Data Output	–
23	–	GND	Ground	1
24	CML-O	Rx4n	Receiver Inverted Data Output	–
25	CML-O	Rx4p	Receiver Non-Inverted Data Output	–
26	–	GND	Ground	1
27	LVTTL-O	ModPrsL	Module Present	–
28	LVTTL-O	IntL	Interrupt	–
29	–	VccTx	+3.3V Power Supply Transmitter	2
30	–	Vccl	+3.3V Power Supply	2
31	LVTTL-I	InitMode	Initialization mode; In legacy QSFP applications, the InitMode pad is called LPMODE	–
32	–	GND	Ground	1
33	CML-I	Tx3p	Transmitter Non-Inverted Data Input	–
34	CML-I	Tx3n	Transmitter Inverted Data Input	–
35	–	GND	Ground	1
36	CML-I	Tx1p	Transmitter Non-Inverted Data Input	–
37	CML-I	Tx1n	Transmitter Inverted Data Input	–
38	–	GND	Ground	1
39	–	GND	Ground	1
40	CML-I	Tx6n	Transmitter Inverted Data Input	–
41	CML-I	Tx6p	Transmitter Non-Inverted Data Input	–
42	–	GND	Ground	1
43	CML-I	Tx8n	Transmitter Inverted Data Input	–
44	CML-I	Tx8p	Transmitter Non-Inverted Data Input	–
45	–	GND	Ground	1
46	–	Reserved	For future use	3
47	–	VSl	Module Vendor Specific 1	3
48	–	VccRx1	3.3V Power Supply	3
49	–	VS2	Module Vendor Specific 2	3
50	–	VS3	Module Vendor Specific 3	3
51	–	GND	Ground	1
52	CML-O	Rx7p	Receiver Non-Inverted Data Output	–
53	CML-O	Rx7n	Receiver Inverted Data Output	–
54	–	GND	Ground	1
55	CML-O	Rx5p	Receiver Non-Inverted Data Output	–
56	CML-O	Rx5n	Receiver Inverted Data Output	–
57	–	GND	Ground	1
58	–	GND	Ground	1
59	CML-O	Rx6n	Receiver Inverted Data Output	–
60	CML-O	Rx6p	Receiver Non-Inverted Data Output	–
61	–	GND	Ground	1
62	CML-O	Rx8n	Receiver Inverted Data Output	–
63	CML-O	Rx8p	Receiver Non-Inverted Data Output	–
64	–	GND	Ground	1
65	–	NC	No Connect	3
66	–	Reserved	For future use	3
67	–	VccTx1	3.3V Power Supply	2
68	–	Vcc2	3.3V Power Supply	2
69	–	Reserved	For future use	3
70	–	GND	Ground	1
71	CML-I	Tx7p	Transmitter Non-Inverted Data Input	–
72	CML-I	Tx7n	Transmitter Inverted Data Input	–
73	–	GND	Ground	1
74	CML-I	Tx5p	Transmitter Non-Inverted Data Input	–
75	CML-I	Tx5n	Transmitter Inverted Data Input	–
76	–	GND	Ground	1
Notes: 1. QSFP-DD TO 2 QSFP56 uses common ground (GND)for all signals and supply (power). All are common within the QSFP-DD TO 2 QSFP56 module and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal-common ground plane. 2. VccRx, VccRx1, Vcc1, Vcc2, VccTx and VccTx1 shall be applied concurrently. Requirements defined for the host side of the Host Card Edge Connector are listed in Table 6. VccRx, VccRx1, Vcc1, Vcc2, VccTx and VccTx1 may be internally connected within the module in any combination. The connector Vcc pins are each rated for a maximum current of 1000 mA. 3. All Vendor Specific, Reserved and No Connect pins may be terminated with 50 ohms to ground on the host. Pad 65 (No Connect) shall be left unconnected within the module. Vendor specific and Reserved pads shall have an impedance to GND that is greater than 10 kOhms and less than 100 pF. 4. Plug Sequence specifies the mating sequence of the host connector and module. The sequence is 1A, 2A, 3A, 1B, 2B, 3B. (see Figure 2 for pad locations) Contact sequence A will make, then break contact with additional QSFP-DD TO 2 QSFP pads. Sequence 1A, 1B will then occur simultaneously, followed by 2A, 2B, followed by 3A,3B.

2-Wires EEPROM Interface

A0h address	Name	Value	Description
0	Identifier	18	Type of Serial Module — See SFF-8024,19h:OSFP 8X
1	Version ID	30	the upper nibble is the whole number part andthe lower nibble is the decimal part.Example: 21h
2	Flat_mem	80	Upper memory flat or paged.0b=Paged memory 1b=Flat memory (only page 00h implemented)
	CLEI present
	Reserved Reserved		CLEI code present in upper page 00h
	TWI Maximum speed		Reserved
	Reserved		Reserved
3	Reserved	03	Reserved
	Module state		Current state of Module 001b:ModuleLowPwr state(Flat memory passive cable assemblies)
	Interrupt		Digital state ofIntL Interrupt output signal0b=IntL asserted1b=IntL not asserted (default)
4~7	Bank 0 lane flag	00	Indicates that one or more of the flag bits from bank 0
8	Reserved	00	Module state changed flag
	Reserved		Indicates change of Module state
9~13	Module Interrupt Flags	00	Module Interrupt Flags
14~25	Module monitors	00	Module monitors Temperature MSB
26~30	Module Global Controls	00	ForceLowPwr,Software Reset,Custom
31~36	Module Level Flag Masks	00	Module Level Flag Masks
37~63	Reserved	00	Reserved
64~84	Custom	00	Custom
85	Module Type Encodings	03	00h:Undefined01h:Optical Interfaces: MMF 02h:Optical interfaces: SMF 03h:Passive Cu 04h:Active Cable 005:Base-T
86	Module Host Electrical interface codes(ApSel:0001b)	1D	1A:100GBASE-CR4 NRZ 1D:400G CR8 PAM4
87	Module Media interface codes(ApSel:0001b)	01	01:Copper cable
88	Host/Media Lane Count(ApSel:0001b)	88	7-4:Host Lane Count 3-0:Media Lane Count
89	Lane Assignment(ApSel:0001b)	00	code 1:if application is allowed on a given host lane.bits0-7 correspond to host lanes 1-8
90	Module Host Electrical interface codes(ApSel:0010b)	00	Module Host-Media Interface Advertising Codes
91	Module Media interface codes(ApSel:0010b)	00	Module Host-Media Interface Advertising Codes
92	Host/Media Lane Count(ApSel:0010b)	00	Module Host-Media Interface Advertising Codes
93	Lane Assignment(ApSel:0010b)	00	Module Host-Media Interface Advertising Codes
94	Module Host Electrical interface codes(ApSel:0011b)	00	Module Host-Media Interface Advertising Codes
95	Module Media interface codes(ApSel:0011b)	00	Module Host-Media Interface Advertising Codes
96	Host/Media Lane Count(ApSel:0011b)	00	Module Host-Media Interface Advertising Codes
97	Lane Assignment(ApSel:0011b)	00	Module Host-Media Interface Advertising Codes
98	Module Host Electrical interface codes(ApSel:0100b)	00	Module Host-Media Interface Advertising Codes
99	Module Media interface codes(ApSel:0100b)	00	Module Host-Media Interface Advertising Codes
100	Host/Media Lane Count(ApSel:0100b)	00	Module Host-Media Interface Advertising Codes
101	Lane Assignment(ApSel:0100b)	00	Module Host-Media Interface Advertising Codes
102	Module Host Electrical interface codes(ApSel:0101b)	00	Module Host-Media Interface Advertising Codes
103	Module Media interface codes(ApSel:0101b)	00	Module Host-Media Interface Advertising Codes
104	Host/Media Lane Count(ApSel:0101b)	00	Module Host-Media Interface Advertising Codes
105	Lane Assignment(ApSel:0101b)	00	Module Host-Media Interface Advertising Codes
106	Module Host Electrical interface codes(ApSel:0110b)	00	Module Host-Media Interface Advertising Codes
107	Module Media interface codes(ApSel:0110b)	00	Module Host-Media Interface Advertising Codes
108	Host/Media Lane Count(ApSel:0110b)	00	Module Host-Media Interface Advertising Codes
109	Lane Assignment(ApSel:0110b)	00	Module Host-Media Interface Advertising Codes
110	Module Host Electrical interface codes(ApSel:0111b)	00	Module Host-Media Interface Advertising Codes
111	Module Media interface codes(ApSel:0111b)	00	Module Host-Media Interface Advertising Codes
112	Host/Media Lane Count(ApSel:0111b)	00	Module Host-Media Interface Advertising Codes
113	Lane Assignment(ApSel:0111b)	00	Module Host-Media Interface Advertising Codes
114	Module Host Electrical interface codes(ApSel:1000b)	00	Module Host-Media Interface Advertising Codes
115	Module Media interface codes(ApSel:1000b)	00	Module Host-Media Interface Advertising Codes
116	Host/Media Lane Count(ApSel:1000b)	00	Module Host-Media Interface Advertising Codes
117	Lane Assignment(ApSel:1000b)	00	Module Host-Media Interface Advertising Codes
118~125	Password Entry and Change	00	Password Entry and Change
126	Bank Select Byte	00	The module shall ignore the Bank Select byte if the Page Select byte is outside of the 10h to 1Fh range (inclusive).In this case the Bank Select byte shall revert to bank 0 and read/write operations shall be to bank 0.
127	Page Select Byte	00	Writing the value of a non-supported page shall not be accepted by the module. In such cases the Page Select byte shall revert to 0 and read/write operations shall be to upper page 00h.
128	Identifier	18	Identifier Type of Module
129~144	Vendor name	*	Vendor name(ASCII)
145	Vendor OUI	3C	Vendor IEEE company ID
146	–	18	–
147	–	A0	–
148~163	Vendor PN	*	Part number provided by vendor(ASCII)
164	Vendor rev	41	Vendor rev A
165	–	20	Vendor rev A
200	Module Card Power Class	00	000: Power class 1; 001: Power class 2010: Power class 3; 011: Power class 4100: Power class 5; 101: Power class 6110: Power class 7; 111: Power class 8
201	Max Power	06	Maximum power consumption in multiples of 0.25 W rounded up to the next whole multiple of 0.25 W
202	Cable assembly Length Lenth multiplier field Cable assembly Length Base Length field	*	Multiplier for value in bits 5-0.00 = multiplier of .101 = multiplier of 110 = multiplier of 1011 = multiplier of 100 Link length base value. To calculate actual link length use multiplier in bits 7-6.
203	Media connector Type	23	Type of connector present in the module.See SFF- 8024 for codes.23h:Non-separable Connector
204	Copper cable Attenuation 5GHz	*	Passive copper cable attenuation at 5 GHz in 1 dB increments
205	Copper cable Attenuation 7GHz	*	Passive copper cable attenuation at 7 GHz in 1 dB increments
206	Copper cable Attenuation 12.89GHz	*	Passive copper cable attenuation at 12.89 GHz in 1 dB increments
207	Copper cable Attenuation 25.8GHz	*	Passive copper cable attenuation at 25.8 GHz in 1 dB increments
208	Reserved	00	Reserved
209	Reserved	00	Reserved
210	Near end implementation lane 8	00	0b=Lane 8 implemented in near end1b=Lane 8 not implemented in near end
211	Reserved Implemented lanes in far end	02	Reserved See Table 27 for config code of discrete far end connectors
212	Media interface technology	0A	0A: Copper cable unequalized
213~220	Reserved	00	Reserved
221	Custom	00	Custom
222	Checksum	*	Include bytes 128-221
223~251	User custom info NV	00	User custom info NV
252~255	User custom info NV	00	User custom info NV