Installation Instructions

The 40GBASE-LM4 QSFP+ transceiver replaces a 40GBASE-SR4 QSFP+ transceiver for
applications up to 80 meters. The transceiver uses one pair of MMF fibers and a duplex LC
connector versus the eight fibers with MPO/MTP connectors that are used with the 40GBASE-SR4
QSFP+ transceiver. The transceiver is not interoperable with 40GBASE-SR4 or 10GBASE-SR
transceivers.
The following table lists the transmitter, cable plant, and receiver specifications for the 40GBASE-
LM4 QSFP+ transceiver. The part number is AA1404002-E6.
Parameter Specification
Data rate (nominal) 4 X 10 Gbps
Nominal transmitter center wavelengths 1271, 1291, 1311, 1331
Link distance (OM3 and OM4) Up to 80 m maximum
Operating temperature range 0 °C to +70 °C
Transmitter characteristics
Maximum total average launch power 10.3 dBm
Maximum average launch power, each lane 4.3 dBm
Maximum average launch power of OFF transmitter –30 dBm
Maximum optical return loss tolerance 20 dB
Applicable cable plant
Maximum insertion loss, including connectors 2.6 dB (OM3) or 2.9 dB (OM4)
Minimum optical return loss 20 dB
Maximum link distance 80 m
Receiver characteristics
Maximum average receive power, each lane 4.3 dBm
Maximum input optical power Tolerates direct Tx to Rx connection
Stressed receiver sensitivity –5.0 dBm
40GBASE-ER4 QSFP+ specifications
The following table lists the transmitter and receiver specifications for the 40GBASE-ER4 QSFP+
transceiver with corresponding wavelengths. The reach for this QSFP+ transceiver is up to 40
kilometers. The part number is AA1404003-E6.
Warning:
A direct connection from Tx to Rx can damage the receiver. If you use a short jumper, short fiber
cable, or loopback cable, you must ensure the following to avoid permanent receiver damage:
You must have an attenuator that results in a minimum of 9 dB insertion loss between the transmitter
and receiver.
40GBASE-ER4 QSFP+
QSFP+
May 2018 Installing Transceivers and Optical Components on VOSS 60