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Technology – High bit-rate transport with PLE

Private Line Emulation (PLE) enables Universal Packet Transport!

Traditionally, Communication Service Providers have maintained separate networks: one for IP and packet data traffic, and another for legacy services such as voice, E1/T1/T3 and SONET/SDH. Nowadays, almost all of the traffic carried on their networks is packet-based, including video, voice and data applications between data centers, mobile networks and end-user equipment. This requires operators to consolidate their traffic by transitioning their networks to all-packet, using IP routers, Ethernet switches and packet optical transport network elements. Such single network architectures streamline their operations and reduces both capital investments (CAPEX) and operational expenditures (OPEX).

However, network operators cannot ignore the vast installed base of equipment or wholesale carriers that offer legacy services to their customers. Circuit emulation is a proven and tested technology, used to transport legacy services across packet networks. AimValley has a long history of offering several solutions for E1/T1/T3 and SONET/SDH, for instance using SAToP or CEP protocol in the company’s line of Smart SFPs.

Currently a new method for transparent high bit-rate transport is being worked at in an internet-draft and submitted to the Internet Engineering Task Force (IETF).

Erik van Veelen, one of AimValley’s Senior Network Architects is contributing to forming this new Standard.

This new standardized methodology is named Private Line Emulation over Packet Switched Networks (PLE). Products supporting this standard enable network operators to reliably transport various types of high bit-rate client service such as SONET/SDH, Fibre Channel, OTN and layer 1 Ethernet bit-streams across packet networks.

All that is required are 2 PLE adapters at the service end-points that convert the client signal into packets and vice-versa.

PLE in a Packet Switched Network

PLE utilizes established concepts for the transport of high bit-rate client signals across a packet network. It borrows the packetization and packet header encapsulation from SAToP, and mandates the use of Differential Clock Recovery to enable excellent reconstruction of client signals at the far-end to comply with the demanding jitter and wander requirements for SONET/SDH and other client signals.
High bit-rate signals at 25 Gb/s and above often use multiple signal lanes and forward error correction (FEC). These traffic streams need to be locally processed before transport. The PLE standard describes native service processing functions specific for each of the supported client signal types.

"PLE enables the provision of new and valuable transport services on packet optical networks. This includes high bit-rate payloads such as OC192, FC64G, OTU4, and fully transparent Ethernet. These services can now be offered on packet networks with the same quality and availability as they were previously offered on separate wavelength networks or traditional TDM systems."
Erik van Veelen
Senior Network Architect

AimValley TDM to Packet Expertise

AimValley delivers design services and solutions based on FPGA IP cores, system and board designs, and Smart SFPs to enable a smooth transition towards a unified packet network.

Development of high bit-rate PLE equipment requires an intimate understanding of Telecom network and equipment design, combined with knowledge of standards, protocols, and interfaces. AimValley has a long history in the design and realization of carrier-class solutions for Tier 1 Network Equipment Manufacturers.

AimValley provides a wide range of expertise on high bit-rate Network Migration solutions:

Why PLE?

AimValley Designed 400G Card with AMD Versal FPGA

AimValley Designed Hardware card with multiple QSFP ports

Use cases and dedicated solution scenarios

Let's review some of those solutions:

Why AimValley? Our proven track record!

‘The TDM Network Migration SFPs greatly reduce system and network complexity, offer lower carbon footprint while generating CAPEX and OPEX savings.’

Our integration and verification test teams use a wide array of test and measurement equipment for TDM protocols, synchronization and jitter/wander performance and packet network impairment generators to ensure compliance with Telecom, synchronization, and packet network standards.

Read more about our expertise and project examples:

TSoP Smart SFP for Transparent Network Migration
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