Ascent Communication Technology

400G QSFP 112 FR4 2km Transceiver

Ascent's Q112-400G-FR4-02 is a high-performance, hot-pluggable 400G QSFP112 optical transceiver designed for high-speed data center interconnects and 400G Ethernet applications over single-mode fiber. The module features four 106.25 Gb/s PAM4 optical lanes operating at CWDM wavelengths of 1271, 1291, 1311, and 1331 nm. An integrated optical multiplexer/demultiplexer enables transmission over duplex single-mode fiber with a reach of up to 2 km through a duplex LC interface. Designed for high-density networking environments, the transceiver supports a 4 × 106.25 Gb/s electrical interface, CMIS 5.2 management, and digital diagnostic monitoring. Its compact QSFP112 form factor and maximum power consumption of 9 W make it suitable for high-bandwidth switching and routing applications.

QSFP112 MSA compliant
4x106.25Gb/s PAM4 electrical interface
Maximum power consumption 9W@ Tcase = 70℃
Duplex LC connector
CWDM4 MUX/DEMUX design
Up to 2Km transmission on single mode fiber
Operating case temperature: 0℃~70℃
Single 3.3V power supply
RoHS-6 compliant
400G Ethernet
Data Center Applications
QSFP112 MSA Rev2.1
100G Lambda MSA
IEEE 802.3ck
CMIS Rev5.2
RoHS compliance
GR-468-CORE

Absolute Maximum Rating

Parameter	Symbol	Min	Typical	Max	Unit	Notes
Storage Temperature	TSTG	-40		85	ºC
Operating Relative Humidity	RH	5		85	%	Note1
Supply Voltage	VCC	-0.5	3.3	3.6	V
Damage Threshold, each lane	PIN	4.5			dBm

Note:
[1] Non-condensing.

Recommended Operating Condition

Parameter	Symbol	Min	Typical	Max	Unit	Notes
Case temperature	Tcase	0		70	℃
Supply Voltage	VCC	3.135	3.3	3.465	V
Supply Current	ICC			2871	mA	Tcase =70℃
Module Power Dissipation	P			9	W	Tcase =70℃

Transmitter Operating Characteristic-Optical，Electrica

Parameter	Symbol	Min	Typical	Max	Units	Notes
Optical Data Rate, each Lane		53.125±100ppm			GBd
Modulation Format		PAM4
Line wavelengths		1264.5	1271	1277.5	nm
		1284.5	1291	1297.5	nm
		1304.5	1311	1317.5	nm
		1324.5	1331	1337.5	nm
Total Average Launch Power				9.3	dBm
Average Launch Power, each lane	PAVG	-3.3		3.5	dBm
Optical Modulation Amplitude (OMA), each lane	OMA	-0.3		3.7	dBm
Extinction Ratio	ER	3.5			dB
Side-Mode Suppression Ratio	SMSR	30			dB
Launch power in OMA minus TDECQ, each lane, for ER≥4.5dB		-1.7			dBm
Launch power in OMA minus TDECQ, each lane, for ER <4.5dB		-1.6			dBm
Transmitter and Dispersion Eye Closure for PAM4, each Lane	TDECQ			3.4	dB
Difference in Launch Power between any Two Lanes (OMAouter)				4	dB
Optical Return Loss Tolerance				17.1	dB
Transmitter Reflectance				-26	dB
Average Launch Power of OFF Transmitter, each Lane				-20	dBm
Electrical Data Rate, each lane		53.125±100ppm			GBd
Differential pk-pk input Voltage tolerance	Vpp	800			mV
DC Common Mode Voltage	Vcm	-350		2850	mV	Note1
Differential Termination Resistance Mismatch		-10		10	%
Effective return loss				8.5	dB
Differential to Common Mode Input Return Loss		IEEE 802.3ck Equation (120G-2)			dB
Module Stressed Input Test		IEEE 802.3ck 120G.3.4.2				Note2

Notes:
[1] DC common mode voltage generated by the host. Specification includes effects of ground offset voltage.
[2] BER specified in IEEE 802.3ck 120G.1.1.
Receiver Operating Characteristic-Optical，Electrical
Parameter
Symbol
Min
Typical
Max
Units
Notes
Optical Data Rate, each Lane

53.125±100ppm
GBd

Modulation Format

PAM4

Optical Input Power, each lane

3.5
dBm

Line wavelengths
1264.5
1271
1277.5
nm

1284.5
1291
1297.5
nm

1304.5
1311
1317.5
nm

1324.5
1331
1337.5
nm

Average receiver power, each lane

-7.3

3.5
dBm

Receiver power, each lane
(OMA)

3.7
dBm

Difference in Receiver Power
between any Two Lanes (OMA)

4.1
dB

Receiver Sensitivity
(OMAouter) , each lane

max(-4.6,
SECQ-6)
dBm

Stressed receiver sensitivity
(OMAouter), each laned (max)

-2.6
dBm

Receiver reflectance

-26
dB

Electrical Data Rate, each lane

53.125±100ppm
GBd

Differential Termination
Resistance Mismatch

-10

10
%

Differential output Voltage pk-pk
Vpp

845
mV

DC Common Mode Voltage
Vcm
-350

2850
mV
Note 1
Effective return loss
ERL
8.5

dB

Transition time

8.5

ps

Common mode to differential return loss

IEEE 802.3ck Equation (120G-1)
dB

Note:
[1] DC common mode voltage generated by the host. Specification includes effects of ground offset voltage
Digital Diagnostic Function

Parameter	Symbol	Min	Typical	Max	Units	Notes
Temperature monitor absolute error	DMI_Temp	-3		3	℃	Note1
Supply voltage monitor absolute error	DMI_Vcc	-5%		5%	V	Note2
Bias current monitor absolute error	DMI_Ibias	-10%		10%	mA
Laser power monitor absolute error	DMI_Tx	-3		3	dB
RX power monitor absolute error	DMI_Rx	-3		3	dB

Notes:
[1] Temperature here is depending on module case around Max power dissipation. Temperature monitor is done over operating temperature.[2] Supply voltage monitor is done over operating voltage.

Q112-400G-FR4-02 diagram.png