EFM

VDSL2

This is a standards-based solution providing extended Ethernet connectivity (usually Internet access) over copper voice-grade cabling using asymmetrical DSL (Digital Subscriber Line) technologies.

Residential Usage

The VDSL2 standard offers DSL line rates up to 100Mbps in the downstream (Internet-to-User) direction and up to 100Mbps in the upstream direction, this allows spectra to be used for analogue telephony (POTS – Plain Old Telephone System), VDSL2 is primarily designed for residential usage.

Both data and telephony (POTS) can be used concurrently if so required.

Access Network Frequency Plan

In the UK the ANFP (Access Network Frequency Plan) currently restricts the maximum permitted line rates to 80Mbps/20Mbps per wire pair, this is achieved using ‘power back-off’ so as not to interfere with other xDSL technologies using the same cable binder.

Reach

VDSL2 has a reach of up to 1.5Km, hence the reason this technology has to be deployed at the edge of a Service Provider’s network footprint i.e. in the Street Cabinet which in turn has a fibre-optic backhaul to the Telephone Exchange/Internet service access point.

Typical applications

VDSL2 technologies are used to provide Internet connectivity between residential properties and the chosen ISP (Internet Service Provider). The solution consists of a VDSL2 CPE (router) installed at the home connecting to a VDSL2 DSLAM (DSL Access Multiplexor) located in the PCP (Primary Cross-connect Point or Street Cabinet serving hundreds of residential users) which is ultimately connected to the Internet via a fibre-optic ‘backhaul’ service.

Residential

The majority of residential ‘Superfast Broadband’ services are delivered over VDSL2 in FTTC (Fibre-to-the-Cab) environments.

Multiple Dwelling

This technology is also popular in MDU (Multiple Dwelling Unit) environments such as hotels, hospitals, prisons, apartment blocks, office blocks and student accommodation blocks etc. when extending Internet services (usually installed in the basement) to each room via the existing internal telephone wiring.

Simultaneous Telephony and Data

One of the main attractions of using asymmetric technologies is the ability to use telephony and data simultaneously over the same copper wires, this is achieved by installing filters at each end of the copper wires to separate the POTS (Plain Old Telephone Signals) from the Internet data signals, these filters are also known as POTS Splitters at the DSLAM end of the link.

Zhone

Zhone have VDSL2 products that can bond up to two VDSL2 links offering an aggregate bandwidth of up to 120Mbps/60Mbps.

Products:

  • CPE end devices
  • DSLAM Head-end Systems
  • Zhone Management Systems