Ascent Communication Technology

40G QSFP+ CSR4 300m

The QSFP-40-CSR4-03 transceiver is a high-performance, cost-effective solution for short-reach 40 Gigabit Ethernet connectivity. Designed to operate over multimode fiber (MMF), it supports transmission distances of up to 300 meters on OM3 and 400 meters on OM4 fiber using MTP/MPO-12 connectors. This transceiver module is ideal for data center and enterprise core networks, providing seamless 40G links between switches, routers, and aggregation layers without sacrificing reliability or performance. Built to industry standards, the QSFP-40G-CSR4 Compatible module uses 4x10G lanes (parallel optics) to deliver an aggregate 40G throughput, allowing backward compatibility with 10G networks using breakout cables. It features digital diagnostics monitoring (DDM) for real-time status updates on parameters such as temperature, voltage, and optical power. The module complies with QSFP MSA, SFF-8436, IEEE 802.3ba 40GBASE-SR4, and RoHS-6. With its plug-and-play design, low power consumption, and high reliability, this transceiver is widely used in short-distance server-to-switch connections, rack-to-rack fiber runs, and data center interconnects (DCI).

· QSFP+ MSA compliant

· 4x10Gb/s electrical interface

· Supports 41.2Gb/s aggregate bit rate

· Up to 300m on OM3 MMF

· Single 1x12 MPO receptacle

· Hot-pluggable QSFP+ footprint

· Quad channel full-duplex transceiver module

· Commercial case temperature: 0°C to 70°C

· Single 3.3V power supply

· Maximum power consumption 1 Watt

· Support Digital Diagnostic Monitor interface

· Unretimed XLPPI electrical interface

Absolute Maximum Ratings
It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent
damage to this module.

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Maximum Supply Voltage	V_cc	0		3.6	V
Storage Temperature	T_s	-40		85	°C
Relative Humidity	RH	0		85	%

Recommended Operating Conditions

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Operating Case Temperature	T_case	0		70	°C
Supply Voltage	V_cc	3.135	3.3	3.465	V
Relative Humidity	R_H	5		85	%
Data Rate (Optical)	DR_o		4*10.3125		Gbps
Data Rate (Electrical)	DR_E		4*10.3125		Gbps
Operating Distance	L_D			300(OM3)	m

Electrical Characteristics (EOL, TOP = 0 ~70°C ,VCC = 3.135 to 3.465 V)

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Power Consumption				1	W
Supply Current	I_cc			300	mA
Transmitter
Data Rate, each Lane			10.3125		Gbps
Differential Voltage Pk-Pk	V_pp			900	mV
Input Differential Impedance	R_in		100		Ohm	1
Differential Termination Resistance Mismatch				10	%
Receiver
Data Rate, each lane			10.3125		Gbps
Output Differential Impedance	R_out		100		Ohm
Differential Termination Resistance Mismatch				10	%
Differential Termination Resistance Mismatch
Differential Output Voltage	V_out, _pp			900	mV	2

Note:

1. Connected directly to TX data input pins, AC coupled thereafter.

2. Into 100Q differential termination.

Optical Characteristics (EOL, TOP = 0~70°C ,VCC = 3.135 to 3.465 V)

Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Transmitter(per Lane)
Average Output Power	P_OUT	-7.6		2.4	dBm
Transmit OMA per Lane	TxOMA	-5.6		3.0	dBm	1
Extinction Ratio	ER	3.0			dB
Center Wavelength	λ	840	850	860	nm
RMS Spectral Width	σ			0.65	nm
Transmitter and Dispersion Penalty	TDP			3.5	dB
Transmitter OFF Output Power	P_Off			-30	dBm
Transmitter Eye Mask Definition {X1,X2,X3,Y1,Y2,Y3}		0.23,0.34,0.43,0.27,0.35,0.4
Transmitter Eye Mask Definition {X1,X2,X3,Y1,Y2,Y3}
Receiver(per Lane)
Input Optical Wavelength	λ	840	850	860	nm
Rx Sensitivity per Lane	RSENS			-9.5	dBm	2
Input Saturation Power (Overload)	PSAT	+2.4			dBm
Receiver Reflectance	Rfl			-12	dBm
Loss of Signal Assert	PA	-30			dBm
Loss of Signal De-assert	PD			-12	dBm
LOS Hysteresis	PD - PA	0.5		6	dB