The 100 QSFP28 SR4 100M is a 4x25G hot-pluggable optical transceiver module. It is designed for 100M optical communication applications over multimode fiber using a wavelength of 850nm via MPO connectors.
It is compliant with QSFP28 MSA, IEEE 802.3bm standard.
It is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference. With these features, this easy to install, hot swappable transceiver is suitable to be used in various applications, such as high-performance computing networks, enterprise core and distribution layer applications, data centers.
3 Electrical Characteristics (TOP = 0 to 70 °C, VCC = 3.14 to 3.46 Volts)
Parameter
Symbol
Min.
Typical
Max.
Unit
Note
Supply Voltage
Vcc
3.14
3.3
3.46
V
Supply Current
Icc
750
mA
Transmitter
Input differential impedance
Rin
100
Ω
1
Differential data input swing
Vin.pp
180
1000
mV
Single ended input
voltage tolerance
VinT
-0.3
4
V
Receiver
Differential data output swing
Vout.pp
300
850
mV
2
Single-ended output voltage
-0.3
4
V
Notes:
1) Connected directly to TX data input pins. AC coupled thereafter.
2) Into 100Ω ohms differential termination.
4 Optical Parameters(TOP = 0 to 70 °C, VCC = 3.14 to 3.46 Volts)
Parameter
Symbol
Min.
Typical
Max.
Unit
Ref.
Transmitter
Center Wavelength
λC
840
850
860
nm
Average Launch Power,
each Lane
PAVG
-8.4
+2.4
dBm
Spectral Width (RMS)
λrms
0.6
nm
Extinction Ratio
ER
2
dB
Transmitter and Dispersion Penalty (TDP), each Lane
TDP
4.3
dB
Optical Return Loss Tolerance
ORL
12
dB
Output Eye Mask
Compliant with IEEE 802.3bm
Receiver
Receiver Wavelength
λC
840
850
860
nm
Rx Sensitivity per lane
RSENS
-10.3
dBm
1
Input Saturation Power
(Overload)
Psat
2.4
6
dBm
Receiver Reflectance
Rr
-12
dB
Note:
1. Measured with a PRBS -5 -1 test pattern, @25.78Gb/s, BER<5.2*10 .
5 Diagnostic Monitoring Interface
The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.
Parameter
Symbol
Min.
Typical
Max.
Unit
Note
Temperature monitor absolute error
DMI_Temp
-3
3
°C
Supply voltage monitor
absolute error
DMI _VCC
-0.1
0.1
V
Channel RX power monitor absolute error
DMI_RX
-3
3
dB
Channel Bias current monitor
DMI_Ibias
-10%
10%
mA
Temperature monitor absolute error
DMI_Temp
-3
3
°C
6 Power Supply Filtering
The host board should use the power supply filtering shown in Figure1.
Figure1. Host Board Power Supply Filtering
7 Optical Interface Lanes and Assignment
The optical interface port is a male MPO connector. The four fiber positions on the left as shown in Figure 2,
with the key up, are used for the optical transmit signals (Channel 1 through4).
The fiber positions on the right are used for the optical receive signals (Channel 4 through 1).
The central four fibers are physically present.
Figure 2. Optical Receptacle and Channel Orientation
ESD
This transceiver is specified as ESD threshold 1kV for SFI pins and 2kV for all other electrical input pins, tested per MIL-STD-883, Method 3015.4 /JESD22-A114-A (HBM). However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.
Laser Safty
This is a Class 1 Laser Product according to IEC 60825-1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).
8 Pin Assignment
9 Transceiver Block Diagram
Pin
Logic
Symbol
Max Unit Conditions
Ref.
1
GND
Ground
1
2
CML-I
Tx2n
Transmitter Inverted Data Input
3
CML-I
Tx2p
Transmitter Non-Inverted Data output
4
GND
Ground
1
5
CML-I
Tx4n
Transmitter Inverted Data Output
6
CML-I
Tx4p
Transmitter Non-Inverted Data Output
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 Inverted Data Output
15
CML-O
Rx3n
Receiver Non-Inverted Data Output
16
GND
Ground
1
17
CML-O
Rx1p
Receiver Inverted Data Output
18
CML-O
Rx1n
Receiver Non-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
Vcc1
+3.3V Power Supply
2
31
LVTTL-I
LPMode
Low Power Mode
32
GND
Ground
1
33
CML-I
Tx3p
Transmitter Inverted Data Output
34
CML-I
Tx3n
Transmitter Non-Inverted Data Output
35
GND
Ground
1
36
CML-I
Tx1p
Transmitter Inverted Data Output
37
CML-I
Tx1n
Transmitter Non-Inverted Data Output
38
GND
Ground
1
Note:
1.GND is the symbol for single and supply(power) common for QSFP modules, All are common within the QSFP module and all module voltages are referenced to this potential otherwise noted. Connect these directly to the host board signal common ground plane. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
2.VccRx, Vcc1 and VccTx are the receiver and transmitter power suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown below. VccRx, Vcc1 and VccTx may be internally connected within the QSFP transceiver module in any combination. The connector pins are each rated for maximum current of 500mA.
10 Diagram Mechnical Drawing
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