By “looping back” the connections from the transmit pairs to the receive pairs in network devices, the MTP Loopback creates a complete optical link. This allows you to evaluate the performance of specific components of a network, or the complete link in a network path.
Male and female connector types are available. Choose between standard, 'Elite' and 'Super Elite' ferrule styles to minimize insertion loss and provide better testing performance.
Application
40GbE QSFP+ Optical Testing
Training
Research and Development
Manufacturing Test
Troubleshooting
Quality Control
Features
Available in a wide variety of wiring configurations and fiber types
Compact and portable with lanyard feature
All loopbacks meet TIA/EIA and IEC intermateability standards
8 , 12, and 24 Fiber available
Easy Installation/Removal,available with or without Pull tabs

Connector Performance Specifications
| Model | SM | MM |
| Connector Fiber Count | 8, 12, 24 core | |
| Polish | PC, APC | |
| Housing Color | Standard (green), Elite (Yellow) | Standard(Beige) Elite(Auqa) |
| Insertion Loss Standard type | less than 0.7dB | Less than 0.5dB |
| Insertion loss Elite type | Less than 0.35dB | Less than 0.3dB |
| Return Loss | PC >50dB, APC>60dB | >30dB |
| Durability (500 matings) | less than 0.2dB | |
| Test Eavelength | 1310/1550nm | 850/1300nm |
Fiber Cable Perfomance Specifications
| Fiber Type | OS2, OM1, OM2, OM3, OM4 |
| Fiber Count | 8, 12, 24, 48, 72, 96, 144 cores |
| Cable Diameter | 3.0mm 5.5mm or customized |
| Jacket Color | Yeloow, Orange, Aqua, Purple |
| Jacket Material | OFNR, OFNP, PVC, LSZH |
| Tensile Strength | 500N |
| Operating Temperature | -20 to 70 ℃ |
| Storage Temperature | -40 to 75℃ |