Installation Instructions

Parameter Specification
Maximum optical modulation amplitude 3.5 dBm
Maximum average optical power of OFF transmitter,
each lane
–30 dBm
Minimum extinction ratio at 10.3125 Gbps 3.5 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
Data rate, total 40GBase 41.25 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
Average receive power, each lane at 10.3125 Gbps. –13.7 to 2.3 dBm
Maximum receiver power, each lane in OMA. 3.5 dBm
Maximum receiver sensitivity in OMA, each lane at
10.3125 Gbps.
–11.5 dBm
Maximum receiver reflectance –26 dBm
Stressed receiver sensitivity, each lane at 10.3125 Gbps. –9.6 dBm
Receive input optical power (damage threshold per lane) 3.3 dBm
40GBASE-LM4 QSFP+ specifications
This transceiver operates up to 80 meters on 50 µm MMF cable plant and is compliant with channel
insertion loss specified in IEEE standard 802.3-2012, Table 52-10, for 2000 (OM3) or 4700 MHz*km
(OM4) 50 um multimode fiber.
Note:
Channel insertion loss includes connectors.
The 40GBASE-LM4 QSFP+ transceiver supports a link configuration of a backbone cable between
patch panels with one jumper from the transceiver to the patch panel at each end. All ends support
duplex LC connectors. Connector return loss requirement is 20 dB or greater (reflectance –20 dB or
less).
Other 10GBASE-S transceivers and link parameters do not apply, as the LM4 operates in the 1310
nm region. The 40GBASE-LM4 QSFP+ transceiver contains four transmitters where the signal is
internally multiplexed to the Tx port and contains four receivers where the signal is internally
demultiplexed at the Rx port.
QSFP+ transceiver specifications
May 2018 Installing Transceivers and Optical Components on VOSS 59