Circuit Emulation Service
Encyclopedia
Circuit Emulation Service (CES) is an emerging telecommunication technology used to transmit time-division multiplexed
(TDM) services such as the traditional Digital Signal
(DS) and the E-carrier
circuits over Asynchronous Transfer Mode
(ATM) networks. Newer applications use CES to carry TDM/ATM over packet switched network
s (CESoP).
The core networks are in the evolution to packet switched networks such as Metro Ethernet, IP/Ethernet and MPLS. These packet switching based networks provide more cost-effective communications with comparison with traditional TDM based networks (PDH, SDH), especially for today's exponentially increasing Internet services.
But the legacy TDM and ATM equipment has been widely deployed in traditional telecommunication networks: PBX in enterprise offices, PDH/SDH equipment in carrier offices and near wireless stations. These investments are providing a big portion of service providers' profits and must be protected in the future. Especially the widely deployed 2G and 2.5G base stations are using TDM based interfaces to communicate with BSC (Base Station Controller). The early deployed 3G Node B is using ATM based protocols running on PDH/SDH physical interfaces. These base stations will exist for quite a long time in evolution to LTE.
Circuit Emulation Service technology provides future-ready solution to seamlessly migrate to packet switched networks. With CES, the legacy TDM and ATM services are supported with much more cost-effective infrastructures based on low-cost and highly available Ethernet devices. This a reverse mapping approach with regard to traditional solutions in which IP/Ethernet services is carried in ATM or PDH/SDH protocols.
CES technology makes it possible to leverage the modern network technologies like MPLS or IP backbones, Metro Ethernet, WiFi, IP-DSLAM and GPON/EPON access networks.
Time-division multiplexing
Time-division multiplexing is a type of digital multiplexing in which two or more bit streams or signals are transferred apparently simultaneously as sub-channels in one communication channel, but are physically taking turns on the channel. The time domain is divided into several recurrent...
(TDM) services such as the traditional Digital Signal
Digital Signal 1
Digital signal 1 is a T-carrier signaling scheme devised by Bell Labs. DS1 is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside North America, Japan, and South Korea...
(DS) and the E-carrier
E-carrier
In digital telecommunications, where a single physical wire pair can be used to carry many simultaneous voice conversations by time-division multiplexing, worldwide standards have been created and deployed...
circuits over Asynchronous Transfer Mode
Asynchronous Transfer Mode
Asynchronous Transfer Mode is a standard switching technique designed to unify telecommunication and computer networks. It uses asynchronous time-division multiplexing, and it encodes data into small, fixed-sized cells. This differs from approaches such as the Internet Protocol or Ethernet that...
(ATM) networks. Newer applications use CES to carry TDM/ATM over packet switched network
Packet switched network
A packet-switched network is a digital communications network that groups all transmitted data, irrespective of content, type, or structure into suitably sized blocks, called packets...
s (CESoP).
The core networks are in the evolution to packet switched networks such as Metro Ethernet, IP/Ethernet and MPLS. These packet switching based networks provide more cost-effective communications with comparison with traditional TDM based networks (PDH, SDH), especially for today's exponentially increasing Internet services.
But the legacy TDM and ATM equipment has been widely deployed in traditional telecommunication networks: PBX in enterprise offices, PDH/SDH equipment in carrier offices and near wireless stations. These investments are providing a big portion of service providers' profits and must be protected in the future. Especially the widely deployed 2G and 2.5G base stations are using TDM based interfaces to communicate with BSC (Base Station Controller). The early deployed 3G Node B is using ATM based protocols running on PDH/SDH physical interfaces. These base stations will exist for quite a long time in evolution to LTE.
Circuit Emulation Service technology provides future-ready solution to seamlessly migrate to packet switched networks. With CES, the legacy TDM and ATM services are supported with much more cost-effective infrastructures based on low-cost and highly available Ethernet devices. This a reverse mapping approach with regard to traditional solutions in which IP/Ethernet services is carried in ATM or PDH/SDH protocols.
CES technology makes it possible to leverage the modern network technologies like MPLS or IP backbones, Metro Ethernet, WiFi, IP-DSLAM and GPON/EPON access networks.
External links
- IPITEK CES gateway and transport equipment for wireless back-haul and enterprise applications.
- Zarlink Semiconductor, ZL501XX series of chips with SAToP and CESoPSN support
- RAD Communications, CES gateway equipment for office and wireless applications
- Cambridge Industries Group, low-cost port-intensive CES access equipment integrated with GPON/EPON access technology