APRESIA H-LR4-QSFP+ Compatible 40G QSFP+ LR4 Transceiver Module (1271nm, 1291nm, 1311nm, 1331nm SMF 10km LC DDM)
The 40G QSFP+ LR4 is a transceiver module designed for 10km optical communication applications. The design is compliant with 40GBASE-LR4 of the IEEE P802.3ba standard. The module converts 4 inputs channels (ch) of 10Gb/s electrical data to 4 CWDMoptical signals and multiplexes them into a single channel for 40Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 40Gb/s input into 4CWDM channels signals and converts them to 4-channel output electrical data.
Product Details
| APRESIA Compatible | H-LR4-QSFP+ | Vendor Name | Walsun |
| Form Factor | QSFP+ | Max Data Rate | 40Gbps |
| Wavelength | 1271nm, 1291nm 1311nm, 1331nm |
Max Distance | 10km |
| Connector | LC | Transmitter Type | 4 Lanes CWDM DFB |
| Cable Type | SMF | Receiver Type | PIN |
| TX Power | -7~2.3dBm | Receiver Sensitivity | < -14dBm |
| Protocols | OTN OTU3, 40G Ethernet, Infiniband, FiberChannel, SATA/SAS3, MSA Compliant | Operation Temperature | 0 to 70°C (32 to 158°F) |
40GBASE-SR4 vs. LR4 vs. CSR4 vs. CR4: How to Choose?
40GBASE-SR4/LR4/CSR4/CR4 modules are all designed for 40G Ethernet transmissions. You may wonder which one is better. And the answer will definitely depend on the specific applications and whether the transceiver’s performance can meet your application. In the table below, the major differences between these three QSFP+ transceivers and a QSFP+ cable have been listed for your reference.
| Parameter | QSFP-40G-SR4 | QSFP-40G-LR4 | QSFP-40G-CSR4 | QSFP-40G-CR4 |
|---|---|---|---|---|
| Optical Tx | VCSEL | DFB CWDM | VCSEL | N/A |
| Wavelength | 850 nm | 1310 nm | 850 nm | N/A |
| Cable Type | MMF | SMF | MMF | MMF |
| Connector | MTP/MPO | LC duplex | MTP/MPO | QSFP+ to 4 SFP+/duplex LC |
| Optical Tx | VCSEL | DFB CWDM | VCSEL | N/A |
| Optical Tx | VCSEL | DFB CWDM | VCSEL | N/A |
| Max. Cable Distance | 100 m (OM3) 150 m (OM4) |
10 km | 300 m (OM3) 400 m (OM4) |
7 m (passive) 10 m (active) |
What’s the difference between QSFP-40G-LR4 and QSFP-40G-PLR4?
QSFP-40G-PLR4 is also named as QSFP-40G-LR4 PSM by some IT peers in an informal way. The major differences between 40GBASE-LR4 and 40GBASE-PLR4 lie in their optical interface and supported protocols. Based on IEEE 802.3ae 10GBASE-LR standard, 40GBASE-PLR4 module comes with an MTP/MPO connector, but the 40GBASE-LR4, based on IEEE 802.3ba 40GBASE-LR4 standard, is equipped with a duplex LC connector.
What’s the difference for 40GBASE-SR4 vs. AOC?
Like the 40GBASE-SR4 transceiver, 40G AOC (active optical cable) is also used for 40GbE applications in a short distance. But the difference is that the QSFP+ AOC is a pre-terminated optical cable, terminated with 40GBASE-QSFP+ on one end, while on the other end, besides QSFP+ connector, it can be terminated with SFP+ connector, LC connector, etc. Conventionally, the link distance of 40G AOC is no farther than 100 meters.
How to distinguish between 40GBASE-ER4 and 40GBASE-LR4?
Similar to 40GBASE-LR4, 40GBASE-ER4 (QSFP-40G-ER4), with a duplex LC connector, is also used for long-distance transmission. But these two 40G transceivers show differences in transmission distance and IEEE standard. Complying with the IEEE 802.3bm 40GBASE-ER4 standard, the link distance of QSFP-40G-ER4 is up to 40 km over the single mode cable.
Walsun 40G Optical Transceiver FAQs
Q：Which QSFP 40G optical transceiver can be used for 4×10G?
A：40GBASE-SR4, 40GBASE-CSR4, 40GBASE-PLR4, and 40GBASE-PLRL4 are all using parallel technology with 4 lanes in each direction. These 40G transceivers can be split into 4x10G.
Q：What cable type is needed for the PLRL4 and PLR4 transceivers?
A：PLR4 and PLRL4 modules use single-mode MTP-12 cables with MTP-12 APC (Angle polished connector) connectors.
Q：What are the advantages and disadvantages of DAC and AOC cables?
A：There are some advantages of using a QSFP+ DAC cable: lower cost and power consumption, higher data transmission rate, strong interchangeability and “plug and play.” QSFP+ DAC cables also have their shortfalls: heavier weight and larger volume, limited distance, and difficult to manage. Here are some of the pros behind AOC cables: lighter weight, greater bandwidth, and EMI immunity. The relatively higher price, however, may obstruct some customers’ choices.
Q：QSFP+ DAC vs. QSFP+ AOC vs. QSFP+ transceiver, which way to go?
A：The most effective way to decide is to take transmission distance into consideration. When the transmission distance is under 15 m, using reliable QSFP+ passive copper cable is the most cost-effective solution. When 40G link distance is between 15 m and 100 m, 40G QSFP+ AOC with longer maximum transmission is recommended. If the link distance is longer than 100 m, you can choose 40GBASE-SR4 transceiver working with OM3 over 100 m or OM4 over 150 m, or 40GBASE-LR4 transceiver along with SMF for longer distances of data transmission.
Q：What compatible brands of QSFP 40G transceivers are available from Walsun?
A：Walsun offers cost-effective generic QSFP+ and QSFP+ transceivers compatible with major brands like Cisco, HP, Juniper, Brocade, Dell, Extreme, H3C, Arista, Huawei, Intel, IBM, Netgear, Ciena, D-Link, Avago, F5 Networks, Avaya, Alcatel-Lucent, Aruba Networks, Allied Telesis, SMC Networks, TRENDnet, etc.
Q：Can Walsun QSFP+ modules and patch cables be shipped directly from North America or Europe?
A：Yes. Walsun founded warehouses in North America, Europe, Australia, and Asia. Till now, we have prepared lots of transceiver modules and patch cables in stock. As long as the products you order are all in stock, we will ship them out the same day you place your order from the nearest warehouse.
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