With four times the capacity and the ability to cost-effectively migrate to 100GbE. 40GbE is regarded as the next logical step in the evolution of the data network. This increased speed will allow 40GbE-enabled equipment to handle traffic at the aggregation and core layers. Therefore, a large variety of 40GbE products including 40G QSFP+ and QSFP+ cables have been developed to support this new technology. This article will address some basic information about four 40GBASE-LR4 QSFP+ modules—QSFP-40GE-LR4, QSFP-40G-LR4, QSFP-40G-LR4-S and WSP-Q40GLR4L and the difference between them.
A Closer Look at Cisco 40GBASE-LR4 QSFP+
These four 40G QSFP+ modules are similar to each other. Customers might be mistaken if they don’t know how to differ them. In general, QSFP-40GE-LR4, QSFP-40G-LR4 and QSFP-40G-LR4-S are compatible with 40GBASE-LR4, yet WSP-Q40GLR4L are compatible with 40GBASE-LR4-Lite. They all operate over single-mode fiber with LC connectors. More detailed information will be displayed in the following part.
These four 40G QSFP+ modules are similar to each other. Customers might be mistaken if they don’t know how to differ them. In general, QSFP-40GE-LR4, QSFP-40G-LR4 and QSFP-40G-LR4-S are compatible with 40GBASE-LR4, yet WSP-Q40GLR4L are compatible with 40GBASE-LR4-Lite. They all operate over single-mode fiber with LC connectors. More detailed information will be displayed in the following part.
- QSFP-40GE-LR4
QSFP-40GE-LR4 is Cisco 40GBASE-LR4 QSFP+ transceiver module, which is designed for single-mode fiber with duplex LC connector. QSFP-40GE-LR4 operates at a wavelength of 1310nm and supports link length of up to 10km.
- QSFP-40G-LR4
This Cisco 40GBASE-LR4 QSFP module supports link lengths of up to 10km over a standard pair of G.652 single-mode fiber with duplex LC connectors. The 40 Gigabit Ethernet signal is carried over four wavelengths. Multiplexing and demultiplexing of the four wavelengths are managed within the device.
- QSFP-40G-LR4-S
QSFP-40G-LR4-S is the Cisco 40GBASE-LR4 QSFP module supporting link lengths of up to 10 km over a standard pair of G.652 single-mode fiber with duplex LC connectors. The QSFP-40G-LR4-S belongs to Cisco S-class Optics that supports 40GBase Ethernet rate only. QSFP-40G-LR4-S does not support FCoE.
- WSP-Q40GLR4L
This Cisco WSP-Q40GLR4L QSFP module supports link lengths of up to 2km over a standard pair of G.652 single-mode fiber (SMF) with duplex LC connectors. The 40 Gigabit Ethernet signal is carried over four wavelengths. It is interoperable with 40GBase-LR4. The operating temperature range is from +10 to +60°C with an optical link budget of 4 decibels. This 4-decibel link budget offers the ability to support the loss from patch panels in the link in a data center environment.
A Fair Contrast Between These Modules
Cisco QSFP-40GE-LR4 vs. Cisco QSFP-40G-LR4
Cisco QSFP-40GE-LR4, compared with Cisco QSFP-40G-LR4 has a plus letter “E”. What does it mean? According to the Cisco data sheet, QSFP-40GE-LR4 supports 40GBase Ethernet rate only, whereas the QSFP-40G-LR4 supports OTU3 data rate in addition to 40GBase Ethernet rate.
Cisco QSFP-40GE-LR4 vs. Cisco QSFP-40G-LR4
Cisco QSFP-40GE-LR4, compared with Cisco QSFP-40G-LR4 has a plus letter “E”. What does it mean? According to the Cisco data sheet, QSFP-40GE-LR4 supports 40GBase Ethernet rate only, whereas the QSFP-40G-LR4 supports OTU3 data rate in addition to 40GBase Ethernet rate.
QSFP-40G-LR4-S vs. Other Transceivers
From the above description, we know that QSFP-40G-LR4-S is the Cisco S-class optics and others are non-S-Class optics. There are no obvious differences between S-class optics and non-S-Class optics on specification. But one thing is for sure that S-class optics is only for Ethernet protocol, not for OTN (Optical Transport Network) or WAN-PHY (Wide Area Network Physics). In addition S-class optics have different temperature ranges with non-S-class optics. Thus if you don’t have any special requirement, QSFP-40G-LR4-S are cheaper and should be just fine for you.
From the above description, we know that QSFP-40G-LR4-S is the Cisco S-class optics and others are non-S-Class optics. There are no obvious differences between S-class optics and non-S-Class optics on specification. But one thing is for sure that S-class optics is only for Ethernet protocol, not for OTN (Optical Transport Network) or WAN-PHY (Wide Area Network Physics). In addition S-class optics have different temperature ranges with non-S-class optics. Thus if you don’t have any special requirement, QSFP-40G-LR4-S are cheaper and should be just fine for you.
WSP-Q40GLR4L vs. Others
WSP-Q40GLR4L is compatible with 40GBASE-LR4-Lite. While the others are compatibles with 40GBASE-LR4 standard. 40GBASE-LR4 (long range) is a port type for single-mode fiber and uses 1300nm lasers. The pluggable QSFP+ 40GBASE-LR4-Lite product namely WSP-Q40GLR4L is aimed at data center applications with reduced environmental and operating requirements, and a limited 2km reach. Yet standard-compliant LR4 modules meet all the requirements and have a 10km reach.
WSP-Q40GLR4L is compatible with 40GBASE-LR4-Lite. While the others are compatibles with 40GBASE-LR4 standard. 40GBASE-LR4 (long range) is a port type for single-mode fiber and uses 1300nm lasers. The pluggable QSFP+ 40GBASE-LR4-Lite product namely WSP-Q40GLR4L is aimed at data center applications with reduced environmental and operating requirements, and a limited 2km reach. Yet standard-compliant LR4 modules meet all the requirements and have a 10km reach.
Summary
These Cisco 40GBASE QSFP offers customers high-density and low-power 40 Gigabit Ethernet connectivity options for data center. QSFP-40GE-LR4, QSFP-40G-LR4, QSFP-40G-LR4-S and WSP-Q40GLR4L are similar but differ in small aspects, which requires designers to select the suitable one for their application. Fiberstore provides a variety of compatible Cisco QSFP+ modules that are well tested by Test Assured Program.
These Cisco 40GBASE QSFP offers customers high-density and low-power 40 Gigabit Ethernet connectivity options for data center. QSFP-40GE-LR4, QSFP-40G-LR4, QSFP-40G-LR4-S and WSP-Q40GLR4L are similar but differ in small aspects, which requires designers to select the suitable one for their application. Fiberstore provides a variety of compatible Cisco QSFP+ modules that are well tested by Test Assured Program.
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