The 100G QSFP28 transceiver comparison
There are different variants for QSFP28 form factor available. Depending on your cabling and
application you need to chose the right option. To make it easier we created an overview with all
the different variants.
(without Active-Optical-Cables and Direct-Attached-Cables)
The main difference between Q.161HG.x and Q.85/131HG.x is the connector type. QSFP28 like Q.161HG.x do have an integrated LAN-WDM Mux/Demux which multiplexes all 4 lanes to only one fiber. The same for Q.161HG.x.C/CL but with CWDM Mux/Demux. This gives the ability to use a LC-Duplex connector with a standard Multimode- or Singlemode-Fiber.
QSFP28 with MTP/MPO connector are more price sensitive. There is just a cabling with MTP/MPO cables needed.
Note: a QSFP28 LR4 is interoperable with a QSFP28 LR4. I didn't mention this in the columen "interoperability" for a better overview. This applies to all other types as well.
From a technical point of view a "split operation" is possible with all QSFP28 mentioned above. QSFP28 get always 4 x 25G/28G from the host on the electrical side. Only the programming of the transceiver needs to be adapted for the host. On the optical path you have to check how to split up the signal in 4 dedicated 25G/28G lines. For the ones with MTP/MPO receptacle this is not a problem with Breakout-cables.
For connecting to SFP28 please have a look on the available SFP28 transceivers.
P.1328G.10
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The main difference between Q.161HG.x and Q.85/131HG.x is the connector type. QSFP28 like Q.161HG.x do have an integrated LAN-WDM Mux/Demux which multiplexes all 4 lanes to only one fiber. The same for Q.161HG.x.C/CL but with CWDM Mux/Demux. This gives the ability to use a LC-Duplex connector with a standard Multimode- or Singlemode-Fiber.
QSFP28 with MTP/MPO connector are more price sensitive. There is just a cabling with MTP/MPO cables needed.
| Description/ Connector | Distance | Wavelength | Connector | Details | Interoperability | Types |
| QSFP28 SR4 | 70m (OM3) 100m (OM4) | 4 x 850nm | MTP/MPO | IEEE 802.3ba (100GBASE-SR4) | SFP28 SR | (Ethernet) (Eth, OTU4, FC) |
| QSFP28 PIR4 | 2km (G.652) | 4 x 1310nm | MTP/MPO | 4 x 25/28G operations on SMF | SFP28 LR |
(Ethernet) |
| QSFP28 IR4/LR4 lite | 2km (G.652) | 1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm | LC | 4-Channel LAN-WDM Mux/Demux inside | QSFP28 LR4 | (Ethernet) Q.161HG.2.F (Eth, OTU4, FC) |
| QSFP28 CWDM4/CLR4 | 2km (G.652) | 1271nm, 1291nm, 1311nm, 1331nm | LC | IEEE 802.3ba (100GBASE-CWDM4)4-Channel CWDM Mux/Demux inside | CWDM SFP28 | (Host with FEC required) |
| QSFP28 LR4 | 10km (G.652) | 1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm | LC | IEEE 802.3ba (100GBASE-LR4)4-Channel LAN Mux/Demux inside | SFP28 LR QSFP28 IR4 | (Ethernet) (Eth, OTU4, FC) |
| QSFP28 CLR4+ | 10km (G.652) | 1271nm, 1291nm, 1311nm, 1331nm | LC | 4-Channel CWDM Mux/Demux inside | QSFP28 CWDM4 SFP28 CWDM | |
| QSFP28 ER4 lite | 25km (G.652) | 1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm | LC | 4-Channel LAN Mux/Demux inside | QSFP28 LR4 SFP28 LR | (Ethernet) Q.161HG.25.F (Eth, OTU4, FC) (Tx Optimized) |
From a technical point of view a "split operation" is possible with all QSFP28 mentioned above. QSFP28 get always 4 x 25G/28G from the host on the electrical side. Only the programming of the transceiver needs to be adapted for the host. On the optical path you have to check how to split up the signal in 4 dedicated 25G/28G lines. For the ones with MTP/MPO receptacle this is not a problem with Breakout-cables.
For connecting to SFP28 please have a look on the available SFP28 transceivers.
P.1328G.10
Why qsfp28 ER 40km is not yet available on the market? do you (industry) have plans to do DWDM qsfp28 ( 4*25G each channel fixed DWDM channel, at least 10-20km model)?
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