Installation Instructions

The cable plant must have a minimum of 9 dB insertion loss between the transmitter and receiver
for correct operation. If the fiber cable does not have this much loss, use an attenuator to meet the 9
dB requirement. No attenuator is needed if insertion loss is at least 9 dB.
Table 24: IEEE 802.3ae 40GBASE-ER4 QSFP+ specifications
Parameter Specification
Distance Up to 40 kilometers
Loss budget 18.5 dB
Transmitter characteristics
Line rate 10 Gbps
Signaling rate, each lane 10GBASE 10.3125 Gbps
Lane wavelength ranges 1264.5 nanometers to 1277.5 nanometers
1284.5 nanometers to 1297.5 nanometers
1304.5 nanometers to 1317.5 nanometers
1324.5 nanometers to 1337.5 nanometers
Total average optical power 10.5 dBm
Average optical power,
each lane at 10.3125
Gbps
Min.
–2.7
Max.
4.5
Units
dBm
Difference in optical power between any two lanes 4.7 dB OMA
Minimum side mode suppression ratio 30 dBm
Optical modulation
amplitude
Min.
0.3
Max.
5
Units
dBm
Maximum average optical power of OFF transmitter,
each lane
–30 dBm
Launch power in OMA minus TDP, each lane, (min.) –0.5 dBm
Minimum extinction ratio at 10.3125 Gbps 5.5 dB
RIN
20
OMA (maximum) –128 dB/Hz
Maximum optical return loss tolerance 20 dB
Receiver characteristics
Line rate 10 Gbps
Signaling rate, each lane 10GBASE 10.3125 Gbps
Damage threshold per lane (min.) 3.8 dBm
Lane wavelength ranges 1264.5 nanometers to 1277.5 nanometers
1284.5 nanometers to 1297.5 nanometers
1304.5 nanometers to 1317.5 nanometers
1324.5 nanometers to 1337.5 nanometers
Average receive power, each lane at 10.3125 Gbps –21.2 to –4.5 dBm
QSFP+ transceiver specifications
May 2018 Installing Transceivers and Optical Components on VOSS 61