The PHILISUN 100G SFP28 to 4x 25G SFP28 active twinax cable is designed for 100G to 4x 25G Ethernet breakout applications.It complies with SFF-8679, SFF-8472, SFF-8402, SFF-8665, hot-pluggable QSFP28 MSA and SFP28 MSA standards.It connects one 100G QSFP28 port to four 25G SFP28 ports for short‑reach interconnections.Features low latency, low power consumption and high reliability, delivering a cost-effective connectivity solution.Ideal for data centers, high-performance computing (HPC), and intra-rack or adjacent-rack connections for switches, routers, servers and storage systems.

 

Pad	Logic		Symbol		Description				Plug Sequence
1	–		GND		Ground				1
2	CML-I		Tx2n		Transmitter Inverted Data Input				3
3	CML-I		Tx2p		Transmitter Non-Inverted Data Input				3
4	–		GND		Ground				1
5	CML-I		Tx4n		Transmitter Inverted Data Input				3
6	CML-I		Tx4p		Transmitter Non-Inverted Data Input				3
7	–		GND		Ground				1
8	LVITL-I		ModSeIL		Module Select				3
9	LVITL-I		Resetl		Module Reset				3
10	–		VCCRx		+3.3V Power Supply Receiver				2
1 1	LVCM0S-I/O		SCL		Two-Wire Interface Clock				3
12	LVCM0S-I/O		SDA		Two-Wire Interface Data				3
13	–		GND		Ground				1
14	CML-O		Rx3p		Receiver Non-Inverted Data Output				3
15	CML-O		Rx3n		Receiver Inverted Data Output				3
16	–		GND		Ground				1
17	CML-O		Rx1p		Receiver Non-Inverted Data Output				3
18	CML-O		Rx1n		Receiver Inverted Data Output				3
19	–		GND		Ground				1
20	–		GND		Ground				1
21	CML-O		Rx2n		Receiver Inverted Data Output				3
22	CML-O		Rx2p		Receiver Non-Inverted Data Output				3
23	–		GND		Ground				1
24	CML-O		Rx4n		Receiver Inverted Data Output				3
25	CML-O		Rx4p		Receiver Non-Inverted Data Output				3
26	–		GND		Ground				1
27	LVTTL-O		ModPrsL		Module Present				3
28	LVTTL-O		IntL/ RxL0SL		I nterrupt. Optionaily configurable as RxL0SL via the Management Interface (SFF-8636).				3
29	–		VCCTx		+3.3V Power Supply Transmitter				2
30	–		VCC1		+3.3V Power Supply				2
31	LVTTL-I		LPMode/Tx Dis		Low Power Mode. Optionally Configurable as Tx Dis via the Management Interface (SFF-8636).				3
32	–		GND		Ground				1
33	CML-I		Tx3p		Transmitter Non-Inverted Data Input				3
34	CML-I		Tx3n		Transmitter Inverted Data Input				3
35	–		GND		Ground				1
36	CML-I		Tx1p		Transmitter Non-Inverted Data Input				3
37	CML-I		Tx1n		Transmitter Inverted Data Input				3
38	–		GND		Ground				1

 

SFP28 Pin Description

 

Pin No.	Symbol		Level/Logic		Description
1	VEET		–		Module Transmitter Ground
2	TX_FAULT		LVTTL-O		Module Transmitter Fault Indication
3	TX_DIS		LVTTL-I		Transmitter Disable; Active High Disable Transmitter Output
4	SDA		LVTTL-I		2-Wire Serial Interface Data Line
5	SCL		LVTTL-I/O		2-Wire Serial Interface Clock
6	MOD_ABS		LVTTL-O		Module A bsent. Connected to Ground in the Module
7	RS0		–		Rate Select 0. Optionally Controls SFP28 Module Receiver
8	RX_LOS		LVTTL-O		Loss of Receiver Signal Indication
9	RS1		–		Rate Select  1, Optionally Controls SFP28 Module Transmitter
10	VEER		–		Module Receiver Ground
11	VEER		–		Module Receiver Ground
12	RD-		CML-O		Receiver Inverted Data Output
13	RD+		CML-O		Receiver Non-Inverted Data Output
14	VEER		–		Module Receiver Ground
15	VCCR		–		Module Receiver 3.3V Supply
16	VCCT		–		Module Transmitter 3.3V Supply
17	VEET		–		Module Transmitter Ground
18	TD+		CML-I		Transmitter Non-Inverted Data Input
19	TD-		CML-I		Transmitter Inverted Data Input
20	VEET		–		Module Transmitter Ground

 

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The PHILISUN QSFP28 to 2×50G QSFP28 Ethernet active direct attach copper breakout cable features an active design for extended reach and a thinner cable profile. It complies with SFF‑8665, QSFP28 MSA, SFF‑8636, and SFF‑8679 standards, and supports hot‑plugging per QSFP28 MSA. Verified on Cisco and Dell target switches, it delivers outstanding performance, quality, and reliability. Ideal for short‑reach connections, it provides a cost‑effective interconnect solution for data centers and high‑performance computing (HPC) environments, linking 100G QSFP28 and 50G QSFP28 ports across switches, routers, servers, and storage in cross‑rack deployments.