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1. Case Title
Spain's ADIF Gets a Boost in High-Speed Railway with Huawei Solutions
(Source: ADIF official website)
Abstract
In 2014, Administrador de Infraestructuras Ferroviarias (ADIF) released a high-speed rail
project involving six local railway lines in Spain. Huawei won every bid with the lion's share
in this project. Huawei's Digital Railway Agile IP Network solution made continuous
breakthroughs in this project. The solution enabled secure, reliable, and efficient operation of
the new high-speed railway lines in Spain and ensured that the railways meet the future trend
of all-IP evolution.
(Source: ADIF official website)
2. Project Background
ADIF is a Spanish company charged with the construction, maintenance, and management of
Spain's railway infrastructure. By June 2013, with a total operating route length of more than
3100 km, Spain's high-speed rail network was the largest in Europe and set a benchmark in
the continent. In 2014, ADIF planned to build six high-speed railway lines totaling 1000 km.
Four integrators, Thales, Indra, Inabensa, and Revenga, would be responsible for constructing
the new high-speed railways. Huawei would provide all wired networks including the IP
MPLS integrated service bearer network, video surveillance access network, and signal bearer
network, making comprehensive breakthroughs in end-to-end serial products such as routers,
switches, and U2000. ETCS-2 standards were applied in the six high-speed railway lines, with
signal systems provided by various vendors including Alstom, Thales, and Ansaldo. Besides
these six lines, planning and designing of another 900 km high-speed railways was under way.
3. Customer Requirements
Spain's new high-speed railways not only require secure, reliable, and efficient operation, but
also need to meet the future trend of all-IP evolution in order to maximize return on
investment (ROI). Therefore, ADIF has the following requirements:

Integrated Service Bearer Network That Supports Efficient Service Interconnection
Multiple key services and high-bandwidth services such as video surveillance services and
information services should be carried by a single network. Some of these services need to be
interconnected. Shorter key service convergence time, service isolation, and abundant quality
of service (QoS) policy configurations are required.

Video Access Network That Provides Large Bandwidths and Associated Services
Wide distribution and coverage of railway video services require large bandwidths. Video
surveillance services need to be associated with SCADA services. Network-based inter-ring
VPN access should be enabled. In addition, trackside access devices must meet railway
environment standards.

Signal Bearer Network That Enables Low-Latency and High Reliability
Ground signal devices, such as interlocking and RBC devices, must be connected with
stations and centers. Individual devices and the entire network should be highly reliable. The
convergence time of key services should be less than 50 ms. Services should support rich
QoS mechanisms. Standby signal channels should be secure and reliable. Unified signal
service IP bearing should be implemented to ensure real-time high reliability.
4. Huawei Solution
Huawei Digital Railway Agile IP Network Solution
Huawei provided the Digital Railway Agile IP Network Solution that met ADIF's
requirements by helping the customer construct an integrated service bearer network, video
access network, and signal bearer network.

Integrated Service Bearer Network
In the solution, MPLS VPN was used to isolate comprehensive station services and video
surveillance services. Huawei's enhanced BDF and patented VPN FRR technologies support
switchover of operating and dispatching services within 50 ms. Hierarchical QoS (HQoS)
mechanism, along with large buffer and high-throughput, enabled precise management of
services with different priorities, such as train control and scheduling, video services, and data
services, ensuring greater service quality. The SCADA system was integrated and
interconnected with the video surveillance platform through the eSDK, enabling automatic
check on onsite alarm situations and improving railway operational efficiency. Hard IP pipes
were used to bear signal services, which prevents bandwidth preemption and ensures that
bandwidths are always available for mission-critical signal services. With hard IP pipes, low
latency and zero packet loss were realized. A unified network management system (NMS) was
implemented. Huawei's innovative IP Flow Performance Monitoring (IP FPM) technology
were used to support precise measurement of railway networks and allow visibility into
railway services and network transmission path quality.

Video Access Network
With a throughput three times bigger than that of the existing service, the video access
network was established to deliver optimal video experiences. Huawei AR550 series gateways
were used for backhaul of trackside video data.

Signal Bearer Network
Huawei solution used switches to construct a train signal bearer network. A primary network
was constructed for signal systems, with single nodes deployed at train stations and double
nodes at the center. The switches of all stations and the center formed an ERPS Layer 2 ring
network (single ring or intersecting rings), where SEP intelligent ring network protection
technology was deployed and to enable 50-ms level signal switchover.
5. Customer Benefits

Reduced TCO
A single IP MPLS network bears multiple services, cutting network construction and
maintenance costs by reducing the number of networks.

Adaptation to the All-IP Trend
Railway networks can meet the future trend of all-IP evolution, maximizing the customer's
ROI.

Easy Deployment and O&M
Services can be added or deleted with ease. Simple configurations, easy deployment, and
convenient bandwidth upgrade improve railway operation efficiency.

Large Bandwidth That Can Be Leased
Having a large bandwidth of up to 10 GB, the customer can choose to lease unused
bandwidth to make additional profits.