Which type of jumper should be used between the OLT and the core switch
Use a single-mode LC-LC duplex fiber optic jumper to connect the OLT to the core switch.
Connector Type
For most modern OLTs and core switches, the SFP or SFP+ transceivers are used, which typically require LC connectors. LC connectors are small, high-density, and easy to operate, making them ideal for data center and telecom environments . Avoid SC or ST connectors unless your equipment specifically uses GBIC modules or older interfaces .
Fiber Mode
- Single-mode fiber (OS2) is recommended for OLT-to-core switch connections because these links are usually long-distance or backbone connections within the network .
- Multimode fiber (OM3/OM4) is generally used for short-distance connections inside data centers, but single-mode ensures minimal signal loss over longer distances .
Duplex vs Simplex
- Duplex jumpers are required because Ethernet and GPON links use separate fibers for transmit (Tx) and receive (Rx) .
- Simplex jumpers are only used for one-way transmission, which is not suitable for OLT-to-switch connections.
Length and Jacket Considerations
- Choose a jumper length that avoids excessive slack but allows for proper routing in racks or cabinets. Common lengths are 1m, 2m, or 3m .
- For indoor or data center environments, LSZH (Low Smoke Zero Halogen) jackets are preferred for fire safety compliance . PVC jackets can be used in non-critical areas.
Summary Recommendation
- Fiber Type: Single-mode (OS2)
- Connector Type: LC-LC
- Configuration: Duplex
- Jacket: LSZH for indoor/data center, PVC if fire code allows
- Length: 1–3 meters depending on rack layout This configuration ensures compatibility with OLT SFP modules and core switch SFP/SFP+ ports, provides low-loss, high-speed connectivity, and meets standard data center safety and performance requirements .
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