Description：
QSFP28+SR4  are designed for use in 100 Gigabit per second links over multimode fiber.They are compliant with the QSFP28 MSA and IEEE 802.3bm The optical transmitter portion of the transceiver incorporates a 4-channel VCSEL (Vertical Cavity Surface Emitting Laser) array, a 4-channel input buffer and laser driver, diagnostic monitors, control and bias blocks. For module control, the control interface incorporates a Two Wire Serial interface of clock and data signals. Diagnostic monitors for VCSEL bias, module temperature,  transmitted optical power ,received optical power and supply voltage are implemented and results are available through the TWS interface. Alarm and warning thresholds are established for the monitored attributes. Flags are set and interrupts generated when the attributes are outside the thresholds. Flags are also set and interrupts generated for loss of input signal (LOS) and transmitter fault conditions. All flags are latched and will remain set even if the condition initiating the latch clears and operation resumes. All interrupts can be masked and flags are reset by reading the appropriate flag register. The optical output will squelch for loss of input signal unless squelch is disabled. Fault detection or channel deactivation through the TWS interface will disable the channel. Status, alarm/warning and fault information are available via the TWS interface.

Features：

1. Up to 27.952 Gbps Data rate per channel
2. Maximum link length of 150m links on OM4 multimode fiber
3. High Reliability 850nm VCSEL technology
4. Electrically hot-pluggable
5. Digital diagnostic SFF-8636 compliant
6. Compliant with QSFP28 MSA
7. Case operating temperature range:0°C to 70°C
8. Power dissipation < 2.0W

Parameter：

Technical   Specifications
Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage   Temperature	Ts	-40	-	85	ºC
Relative Humidity	RH	5	-	95	%
Power   Supply Voltage	VCC	-0.3	-	4	V
Signal   Input Voltage		Vcc-0.3	-	Vcc+0.3	V