Customer Case Studies
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Building Out a Metro Ethernet Network with TDM Service Support
Telecable is a Spanish cable operator that focuses on residential and enterprise customers, mainly in Asturias in the north of the country, which is one of Spain’s “autonomous communities.”
Residential customers are generally connected over an HFC-based network. Enterprise services are mainly delivered using legacy SDH technology. The physical medium for enterprise access is, whenever possible, dark fiber with ring topology, primarily in cities.
Today, E1 services are employed to connect private PBXs or a customer PBX to Telecable’s PSTN. For such services, legacy SDH is used to transport the E1 line.
Two Different Technologies at the Same POP
Telecable had been employing Ethernet-over-SDH (EoSDH) technology to deliver its Ethernet services. Since it is now more common to deploy Ethernet directly over fiber using a Metro Ethernet network, however, it is now possible to see two different technologies – SDH and Ethernet – operating simultaneously at the same Point Of Presence (POP).
In consultation with Elecnor, a RAD partner in Spain, Telecable decided to deploy RAD’s Service Assured Access TDM-over-Ethernet pseudowire technology. Pseudowire simplifies Telecable’s network by enabling it to build out a Metro Ethernet network that can also support TDM services whenever they are required. “TDM-over-Ethernet provides Telecable with the opportunity to simplify the network by allowing us to employ a single technology that supports TDM services when required,” notes Jose Manuel Menendez, the company’s Connectivity & Datacenter Manager.
To continue to provide legacy services over new packet-switched infrastructure.
RAD’s IPmux family of pseudowire access gateways and ETX family of Carrier Ethernet demarcation devices.
“TDM-over-Ethernet provides Telecable with the opportunity to simplify the network by allowing us to employ a single technology that supports TDM services when required.”
Jose Manuel Menendez, Connectivity & Datacenter Manager, Telecable.
“RAD’s pseudowire technology reduces CapEx at the service end points by up to 75% and CapEx at the POP by up to 50%.”
Ignacio Fumenal, General Manager, RAD Iberia.
Telecable now uses this solution to connect new subscribers and plans to expand its deployment of RAD’s IPmux family of pseudowire access gateways and the ETX series of Carrier Ethernet demarcation devices in order to completely retire SDH from its access network. Once that happens, only one access technology – Ethernet – will be available to all customers.
From Telecable’s perspective, RAD’s pseudowire solution has several advantages:
- It is very scalable in terms of the central POP – one 3U-size box can support up to 1,000 E1 services
- Remote TDM equipment is only required if the customer requires TDM, so there is only one access technology inside the Metro Ethernet physical ring
- Because synchronization is assured using a variety of mechanisms, including Sync-E, 1588-2008 and a proprietary solution, it is possible to offer highquality synchronized services, including Sync-as-a-Service, using the same central site equipment and mobile-optimized devices
- RAD’s IPmux family and ETX devices employ standard management protocols (SNMP/ Telnet/HTTP), making it easily integrated into existing management systems
The Business Case
“Before deciding what solution to deploy, Telecable analyzed the impact on OpEx and CapEx by comparing pseudowire to its existing legacy costs,” states Ignacio Fumanal, General Manager of RAD Iberia. “It found that RAD’s pseudowire technology reduces CapEx at the service end points by up to 75% and CapEx at the POP by up to 50%,” he adds. “ These statistics speak for themselves.”
TDM over Ethernet
- One 3U-sized unit can support up to 1,000 E1 services
- Single access technology in the physical ring
- Various synchronization alternatives, including Sync-E, 1588 and a proprietary solution
- Standard management (SNMP/ Telnet/ HTTP)
- Scalable solution
- Remote TDM equipment is required only for TDM customers
- Enables high quality services, including Sync-as-a-Service, using the same central-site equipment and optimized cellular devices
- Continued use of existing management systems
Ideal First-Level POP Aggregator, E-NNI Demarcation Device and Pseudowire Gateway
The ETX-5 delivers aggregated Ethernet and TDM pseudowire traffic from the access network to the PE (provider edge) over 10-GbE links. Part of RAD’s Service Assured solutions for service providers and critical infrastructure, the ETX-5 is ideal for first-level aggregation at the POP, E-NNI inter-carrier demarcation and as a pseudowire gateway for seamless migration to packet networks.
For an enhanced user experience, the ETX-5 is supported by the new RADview management and orchestration system, featuring an intuitive UI/UX to simplify configuration and enable zero-touch service provisioning end-to-end. The ETX-5 is Carrier Ethernet 2.0-certified and includes an extensive toolset to deliver and manage SLA-based services.
Using TDM pseudowire technology, the IPmux-1E delivers ISDN BRI, echo-cancelled E1/T1 or FXS/FXO/E&M services over packet transport, in addition to enabling transparent LAN bridging. It supports carriers in their migration to next-generation networks by allowing them to continue generating revenues from their ongoing legacy services over PSNs. The ease of installation and support for legacy and next-generation Ethernet and IP-based services make it ideal for small and medium-size enterprises (SMEs).