Fiber To The Distribution Point (FTTdp) Solution

A growing demand for network capacity is driving the need for new Fiber infrastructure globally; one that provides capacity for now and for the bandwidth-hungry decades to come. A Fiber to the Home (FTTH) deployment method is the clear solution to our ever-growing information needs, but the cost of implementation is not always viable. Telecommunications companies around the world are needing to embark on cost-benefit analyses to weigh up various methods of providing Fiber to consumers and businesses. The goal is to find an affordable method that will not only meet current demand, but also have the capacity to evolve with future demand without incurring substantial additional costs. In an environment where FTTH is not the clear solution to this problem, Fiber to the Distribution Point (FTTdp) is a promising option.

Features

Features
Deployment
Power
Products
OLT
Abbreviations

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FTTdp Network and Features

FTTdp is short for Fiber To The Distribution Point, It is kind of FTTx, and very similar to FTTC (Fiber to the Curb) or FTTN (Fiber to the Node), but is one-step close again moving the end of the fiber to within meters of the boundary of the customers premises in last junction possible junction box known as the “distribution point” this allows for near-gigabit speeds.

In the FTTdp setup, fiber pervades most of the network, and only the drops from the distribution point to the premises are copper. This is sometimes referred to as a ‘deep fiber’ or the ‘last mile’ network with the copper drops typically between 30m and 200m . Due to the proximity of the distribution point to the premises, a cascaded split architecture is often used to reduce the fiber count to increase quality of service.

FTTdp enables several modern advancements across copper lines: VDSL2, G.Fast, XG.Fast, and G.hn, which are able to reach FTTH-like broadband speeds.

Deployment Scenarios

SP FTTdp VS. FTTH
MP FTTdp VS. FTTB

Single Port FTTdp vs. Fiber To The Home

Single Port FTTdp is the easiest to implement from a DP box hardware perspective, but also the most expensive one. There is one fiber per subscriber which is very costly for the network operators.

The distribution point translates the signals from one fiber to one copper twisted pair. No crosstalk cancelation is required and the line length is short, in the range of 100m but in most cases much shorter. The distribution point is supplied from the customer side using reverse power feeding.

While fiber connections require a technician to install the customer premises equipment, the copper-based CPE may be installed by customer (customer self install), because the only action required installing the copper-based CPE is to connect the CPE to the phone plug with the delivered cable. This saves cost for new subscribers and makes the home installation much easier.
In urban environments, deploying fibers to the subscriber homes may not be possible due to legal restrictions or because of difficulties to install fibers in existing buildings.
Lead times can be unpredictable, particularly if permission for construction work is required from home owners and tenant associations

Multi-Port FTTdp vs. Fiber To The Building

FTTH deployments are very limited and cost is not the only reason for that. Multi-line distribution points are a smarter solution to provide fiber-speed services. Deployments with multi-line DPs are used in areas with a more dense population and multi-unit residential buildings.

Besides in-building or in-home installations, there are different outdoor locations where the distribution point may be placed. Examples are manholes, pole-mounted distribution points or small street cabinets. The main advantage of FTTdp in comparison to existing FTTB solutions is reverse power feeding. It allows placing the DP box at any appropriate place, with out the requirement of a local power supply.

Multi-line DPs with G.fast allow to deliver fiber-speed data rates under these conditions. While the line length of the copper wires is moderate, in most cases shorter than 100m and only in rare cases up to 250m and the cable binder are small, usually no more than 16 pairs. But crosstalk between the pairs limits the achievable data rates for a G.fast service.

Most in-house telephone installations still rely on copper cables for most existing and newly constructed buildings because fibers are expensive and difficult to handle.
The unbundled lines may not be accessible for the service provider to install individual DP boxes.
Especially in existing buildings, the copper wire bundles may be of a poor quality.

Topology	Line length	Binder Size	Power Supply	Crosstalk Environment
1-port DP	1m...100m	1 pair	RPF	No crosstalk
Multiport-DP	10m...250m	1 to 16 pairs	RPF	Self-FEXT

Power Supply Solution

The most critical feature of the DP box is its power consumption and a suitable method to supply the device with power. With the idea of reverse power feeding (RPF), the problem of supplying the DP box with power can be solved. However, this creates new challenges as the energy budget for a reverse powered DP box is very limited. The PSE provides power supply. It directly drives Ethernet twisted pairs by coupling 48 V DC power supply on a service port (RJ-45 port).

Power supplied by PSE

Power supplied by AC

Reduces electric lead and power meter installation fees and shortens the engineering time.
Reduces electricity costs and prolongs device lifecycles.

PSE Specifications:

Dimensions: 33 mm x 120 mm x 66 mm

Integrated power output: 40 V DC, 0.28 A

Maximum output power: 11.2 W

Operating temperature: -5℃ to + 40℃

Products Overview

MA5651

Type	Indoor device
Port	1 x GPON+1 x VDSL2
VDSL2 Profile	17a, 30a
IP Level	IP20
Dimensions	36.5 mm x 126.5 mm × 84 mm
Weight	0.32 kg
Typical Power Consumption	7.9 W
Static Power Consumption	6.9 W

MA5651S

Type	Outdoor device
Port	1 x GPON+1 x VDSL2
VDSL2 Profile	17a, 30a
IP Level	IP54
Dimensions	49.5 mm x 192 mm x 118 mm
Weight	0.66 kg
Typical Power Consumption	7.9 W
Static Power Consumption	6.9 W

MA5652S

Type	Outdoor device
Port	1 x GPON+1 x VDSL2 combo (1 x POTS+1 x VDSL2)+1 x POTS
VDSL2 Profile	17a, 30a
IP Level	IP54
Dimensions	68.5 mm x 192 mm × 118 mm
Weight	0.71 kg
Typical Power Consumption	12.2 W
Static Power Consumption	8.6 W

OLT

Large Capacity OLT (10 U)

16 service slots
128--256 PON ports
8000-- 18,000 users
Large-capacity FTTx deployment
Deployed in high-density cities

Medium Capacity OLT (6 U)

6 service slots
48--96 PON ports
3000--6000 users
Medium-capacity FTTx deployment
Deployed in low-density cities

Small Capacity OLT (2 U)

2 service slots
16--32 PON ports
1000--2000 users
Small-capacity FTTx deployment
Deployed in rural areas and towns

Acronyms and Abbreviations

CO	central office
CPE	customer premises equipment
FTTH+	fiber to the home plus
FTTH	fiber to the home
G.fast	An ultra-bandwidth access technology currently in development. It expands the access frequency band from 30 MHz to 106 MHz or higher. It provides a transmission rate of 1 Gbit/s at 100 m and 500 Mbit/s at 200 m.
GPON	gigabit-capable passive optical network
HGW	home gateway
OLT	optical line terminal
Pico ONU	An access device used in FTTD scenarios

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