The expansion budget is only one, there is only one set of existing links, and the order of actions is different, the difference in money spent can be half. Installment is not about spending money on an annual basis, but doing the cheap things in advance so that each installment can make room for the next installment.

The first phase of double fiber to single fiber, the movement is minimal

If you are still using dual-fiber for point backhaul, switching to single-fiber bidirectional equipment can save one core per link and free up fiber cores for subsequent phases. Only the terminal equipment is moved and the lines are not moved, so the construction amount is minimal. Note that the wavelengths at both ends are different for transmitting and receiving. The A/B ends must be paired. The 100M gear is as follows:100M single mode single fiber one optical one electrical fiber optic transceiverThey are also paired products; except for sections where the power budget is already tight, recalculate section by section before making changes.

The second period of acceleration is based on the recalculation of the balance.

The number of cores determines the number of capacity, and the bandwidth also depends on the speed. From Gigabit to 2.5G or 10G, the total loss window allowed at the end is narrowed, and high-speed modules at the same distance are more demanding on the link.SFP 2.5G single mode dual fiber 20KM optical module and SFP+ 10G single-mode dual-fiber 10km optical moduleThey are all common gears in upgrades. For sections where the recalculation margin at the new rate is less than 3 dB, maintain the original speed first, and do not apply it across the entire network.

Only in the third issue will we talk about adding wavelengths or laying new cables.

• Multiple links with the same route: Consider wavelength division co-fiber. For details, see the article on wavelength division expansion in this group.
• The fiber core and distance have reached the limit: change to higher distance gears step by step
• New services require physical network distribution: only then is cable laying put on the agenda

The advantage of installment is that each phase can be independently accepted and stopped. EB-LINK technical support can provide a three-phase planning table based on the existing link account and speed distribution, call 0755-83179002.