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Advantages of distribution cabling in FTTH
The “Distribution Cabling” runs from the FCP further into the FTTH network and closer to the subscriber base.
Distribution cabling may only need to cover distances of less than 1km before final breakout to the subscribers.
Distribution cabling will generally consist of medium-sized fibre counts targeted to serve a specific number of buildings within the FTTH area.
For underground networks, distribution cables may be ducted, direct buried or grouped within a common micro-duct or tubing network to minimize construction costs and allow other cables to be added on a ‘grow as you go’ basis.
For larger Main Distribution Units (MDUs), the distribution cabling may form the last drop to the building and convert to internal cabling to complete the fibre link. For aerial networks the arrangement will be similar to that of feeder cables.
Distribution cables are smaller in size than the feeder cables. Fibre counts will generally be 48-192.
The diagram shows two examples:
• Micro-duct cable systems
• Conventional loose tube cables
The Figure1 shows direct burial tubes with micro-duct cables.
Figure1. Direct Burial Tubes
The Figure2 shows standard ducts (f.i. 40 mm HDPE) with micro-ducts and installed micro-duct cables.
Figure2. Standard Ducts
These can blow over distances of 1km (typically). Micro ducts offer a means of deferred cable deployment.
The Figure3 shows a typical loose tube cable design. Loose tubes can be installed by blowing (as above), pulling into conventional ducts and sub-ducts; direct burial and by suspension from poles.
Figure3. Typical Loose Tube Cable
Related Knowledge:
Advantages of Drop Cables in FTTH
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