Application in Data Center
Collocated with 10G or 40G or 100G LC/UPC interface transceivers
Which to Choose for a Specific Transceiver?
Considering the common features of the transceiver and the
loopback, we should think about the connector type, polish type,
and cable type when selecting a loopback for the transceiver. The
selection guide for some mostly used transceiver modules is
summarized in the following tables.
Table 1: Loopback choices for 10G SFP+ transceivers
| Model | Interface type | Cable Type | Suited Loopback |
| 10GBASE-USR | LC Duplex (PC) | MMF | LC/UPC Duplex Multimode Fiber Loopback |
| 10GBASE-SR | LC Duplex (UPC) | MMF |
| 10GBASE-LR | LC Duplex (UPC) | MMF |
| 10GBASE-ER | LC Duplex (UPC) | SMF | LC/UPC Duplex Single-mode Fiber Loopback |
| 10GBASE-ZR | LC Duplex (PC) | SMF |
Table 2: Loopback choices for 40G QSFP+ transceivers
| Model | Interface type | Cable Type | Suited Loopback |
| 40GBASE-CSR4 | MTP/MPO (UPC) | MMF | 8/12 Fibers MTP/UPC Multimode Fiber Loopback |
| 40GBASE-SR4 | MTP/MPO (UPC) | MMF |
| 40GBASE-PLRL4 | MTP/MPO (APC) | SMF | 8/12 Fibers MTP/APC Single-mode Fiber Loopback |
| 40GBASE-PLR4 | MTP/MPO (APC) | SMF |
| 40GBASE-LR4 | LC Duplex (PC) | SMF | LC/UPC Duplex Single-mode Fiber Loopback |
| 40GBASE-LR4L | LC Duplex (UPC) | SMF |
| 40GBASE-ER4 | LC Duplex (UPC) | SMF |
| 40GBASE-LX4 | LC Duplex (UPC) | MMF/SMF | LC/UPC Duplex Multimode/Single-mode Fiber Loopback |
Table 3: Loopback choices for 100G QSFP28 transceivers
| Model | Interface type | Cable Type | Suited Loopback |
| 100GBASE-SR4 | MTP/MPO (UPC) | MMF | 8/12 Fibers MTP/UPC Multimode Fiber Loopback |
| 100GBASE-PSM4 | MTP/MPO (APC) | SMF | 8/12 Fibers MTP/APC Single-mode Fiber Loopback |
| 100GBASE-LR4 | LC Duplex (UPC) | SMF | LC/UPC Duplex Single-mode Fiber Loopback |
Table 4: Loopback choices for CFP transceivers
| Model | Interface type | Cable Type | Suited Loopback |
| 40GBASE-SR4 CFP | MPO/MTP (UPC) | MMF | 8/12 Fibers MTP/UPC Multimode Fiber Loopback |
| 40GBASE-LR4 CFP | SC Duplex (UPC) | SMF | SC/UPC Duplex Single-mode Fiber Loopback |
| 40GBASE-FR CFP | SC Duplex (UPC) | SMF |
| 100GBASE-LR4 CFP | SC Duplex(PC/UPC) | SMF |
| 100GBASE-ER4 CFP | SC Duplex(PC/UPC) | SMF |
| 100GBASE-SR4 CFP | MPO/MTP (UPC) | MMF | 24 Fibers MTP/UPC Multimode Fiber Loopback |
Conclusion
This post discusses specific fiber loopback choices for some most
commonly used fiber optic transceivers. For other transceiver
modules that are not mentioned in this post, we can also know how
to choose a suitable loopback for it by getting details about its
interface type, physical contact and cable type.
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