How to Connect MOBILE Sites Under FTTH Coverage?

How to Connect MOBILE Sites Under FTTH Coverage: We all know FTTH stand for Fiber To The Home it providing fiber connectivity to the end user.While FTTM stand for Fiber To The Mobile providing fiber to the mobile based on GPON technology. Telecom operators consider Fiber-to-the-x (FTTx) as the best method to deliver their telecom services to subscribers. FTTx has many network varieties, depending on the termination point.

In this topic I will try to cover "how to connect Mobile sites under FTTH coverage. In other words we can say that how to connect FTTH to FTTM. FDT feeder cable and splitter play the important role in the connection of FTTH to FTTM.The cellular site will be connected from the FTTH distribution cable and considered as a Single Dwelling Unit.

FTTH to FTTM Connection

Connection of Mobile site under FTTH coverage

Connection Between Mobile site (FTTM) and FTTH

FTTM is the best future of telecom services and solution it can brings high speed. FTTM is more advance then FTTH. FTTM provide telecom services to mobile sites 4G and also 5G. One more thing I want to write here that abbreviation of FTTM you will get Fiber-To-The-Meter but explanation will be same.

Now subject is how to connect the Mobile site under FTTH coverage.The 2:4 splitter will always be connected to the spare fibers in the FDT feeder cable.This 2:4 splitting configuration allows the network to have redundancy & resilience paths in the outside plant for mobile backhaul connectivity. It also gives possibility of redundancy at PON card level in the OLT.

2:4 splitters have to be installed in the outside plant. Only in specific situations, when it is well justified, i.e. the RF site and other RF sites are close to an Exchange and end to end fiber is available between the exchange and the RF site, the splitter could be installed in the exchange, which is eliminating the possibility of redundancy in the OSP.

If the Mobile sites are within and FDT boundary they will be served from the FDT feeder cable, out of the specific spare fibers for this use and according to the corresponding Fundamental Plan.

Each mobile site & their duct route would carefully being evaluated, keeping in view the future diversity & redundancy.The ODB can be mounted on wall near to cable management tray or can be placed in rack inside the shelter if space is available.

For MOBILE sites located on roof top, the existing riser will be used to lay the fiber cable. In case there is no extra duct available in the existing riser then a separate duct should be extended up to the MOBILE shelter.

An RF site included in a Fundamental Plan (FPD) will not include specific information other than the one available in the Fundamental Plan (location); the designer will define the 2:4 splitter location, and any other required parameters to serve the site by fiber.

If the site is not in the FTTM project scope, 2 fibers will be terminated from the Distribution cable on to a TB (specific for the site) or an ODB; on the FDT side those fibers will also be terminated on the Distribution ODF and properly tagged. They will not be connected to any splitter at this stage.

Use Of OLT For Connection

It is not a universal rule, its depend upon the telecom operators design but generally Within one OLT, the last two cards can be used for MOBILE connectivity in case of 8 Ports OLT cards, and the last four cards can be used in case of 4 Ports OLT cards. Connectivity will be maintained to business units through the rest of the OLT cards.

OLT port allocation would carefully being utilized in accordance to primary & secondary path protection of 2:4 splitters.Maximum allowable Splitters/ports per OLT are not exceeding (04). Hence the same count must be used to accommodate maximum mobile sites per OLT.

Telecom operators can make sure the connectivity of MOBILE site with the last two (02) cards of OLT in case of 8 Ports OLT cards, and the last four (04) cards in case of 4 Ports OLT cards. You can make connectivity according to your company rule.

Many operators installed 4x 2:4 splitters in the empty panels number 17 & 18, also installed in the empty panels number 15 & 16. Some operators install in panels number 8 & 16 replacing the existing 1:2 splitters. Also installed in the empty panels number 9 & 10. It means its not a universal standard. It can be installed as per company instructions. 

Final Words

The OSF (Optical Splitter Frame) will be 1 U size single unit with 4 x 2:4 splitters inside, which can accommodate the connectivity of 16 mobile sites within one RU. Install patch cords from existing FDF Rack (ODF) / FTTH FDF Rack (ODF) to the splitter and connect the mobile site under FTTH coverage. This is the easiest way to give high speed to a mobile site. Hope you will satisfy with this post.if you have any question you can put in comment box.