GPON, EAD and the Key Differences Between The Two Full-Fibre Connectivity Technologies.

A White Paper from Spitfire Network Solutions

Overview

As full fibre internet connectivity becomes an obligatory not only for enterprise organisations, but for many SMBs, the connectivity industry is confronted by a confusion which threatens to undermine trust in both the technology and its providers. This situation may be, in some part, of the industry’s own doing. Solutions available in the market are based largely on two distinct technologies: EAD (Ethernet Access Direct – referred to as ‘active’ networks) and GPON (Gigabit Passive Optical Network – referred to as ‘passive’ networks). Not surprisingly, a considerable measure of confusion exists amongst consumers as to the difference between the two. Indeed, many customers are unaware of the existence of competing technologies. This is in part due to the practice of some providers of stretching the use of terms such as ‘Fibre Ethernet’ or ‘Leased Line’ (which originally referred to the higher quality EAD) to refer to the lower capability and lower priced GPON technology under soundalike names such as ‘Leased Line Equivalent’ or ‘Fibre Ethernet Equivalent’. While business customers who do not themselves have a technical background can be excused for not understanding the existence of, or difference between, the technologies, we believe it to be important for technical professionals to be clear on this, so as to be able to advise and assist decision making. This short paper recaps the nature of full-fibre connectivity, before clarifying the two technologies (plus the updated XGS-PON variation on GPON) and comparing their relative suitability.

1. Recapping the ISP network architecture and its role in full-fibre connectivity

The core networks operated by Internet Service Providers connect their customers to the internet and to other networks around the world. Ideally, an ISP will have in place numerous peering arrangements and interconnects with Tier 1 transit carriers, so as to provide efficient routing of data to and from its destination and source. To reach the core network of their ISP, a business customer must install a local access circuit into its premises. The access circuit will usually connect to a local Point of Presence (POP), which may be located in a BT telephone exchange or similar facility.

From the POP, the fibre network provider transmits the customer’s data over their ‘backhaul’ network for delivery to the Internet Service Provider.

Two network components (the local access circuit and the backhaul network) are critical to the journey of data from the customer’s local office network to the Internet, and may have significant implications for the reliability, latency, security and overall performance of the service that is delivered. However, this paper is concerned solely with the technologies available for the local access circuit.

All main choices available today for a full fibre access circuit to the premises are based on either an ‘active’ network technology, typically using EAD, or a ‘passive’ network technology using GPON or, more recently, XGS-PON (10 Gigabit Symmetrical – Passive Optical Network).

2. Technical overview and assessment of EAD

EAD is a fibre access technology built on a point-to-point fibre architecture, in which there is a direct connection between an Access Node at the POP, and a unit of Network Termination Equipment (NTE) on the end of that fibre strand at the customer’s premises. Using this kind of solution, an operator can deliver Gigabit speeds to every subscriber without being concerned with the use of a shared resource, as is the case with GPON solutions. EAD evolved from traditional Ethernet leased line services, to provide businesses with high-performance, point-to-point connectivity. Unlike GPON, which uses a shared fibre architecture, EAD offers a dedicated fibre link between the customer premises and the service provider’s Point of Presence (POP). This active network architecture ensures consistent, low-latency performance and enhanced security.

2.1 How EAD Works

EAD leverages a point-to-point active architecture to deliver dedicated fibre connectivity. By eliminating shared paths and contention, EAD ensures predictable performance, stable low latency, and enhanced security for each circuit. This design not only supports real-time, latency-sensitive applications, but also simplifies data transmission and troubleshooting through its streamlined and independent architecture.

Point-to-point active architecture
The direct fibre link between the customer and the provider’s POP used by EAD for data transmission eliminates shared paths and contention, ensuring each circuit operates independently. EAD circuits are not influenced by other users’ activities, and so deliver predictable performance and minimal delays. Consistent low latency is also maintained, which makes EAD ideal for real-time, latency-sensitive applications like video conferencing, VoIP, and financial transactions.

Simplified data transmission
Unlike GPON, EAD does not require complex scheduling mechanisms like Time Division Multiple Access (TDMA) or Dynamic Bandwidth Allocation (DBA) for upstream data scheduling, as all bandwidth is reserved for the single circuit. Customers receive the full capacity of their purchased circuit, e.g. 1Gbps/1Gbps, regardless of network congestion or other users.

Enhanced security
As each EAD circuit, to each customer, is entirely independent, risks of data interception or eavesdropping by other customers are eliminated. This inherent security makes EAD suitable for sensitive or regulated data transmission.

Ease of monitoring and fault isolation
EAD’s dedicated architecture simplifies fault detection and troubleshooting. If a failure occurs, only the affected circuit is impacted, allowing for faster resolution compared to the shared GPON infrastructure.

/contd.