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LOW LATENCY STRUCTURE-AWARE TIME DIVISION MULTIPLEXED CIRCUIT EMULATION SERVICE OVER PACKET SWITCHED NETWORK

IP.com Disclosure Number: IPCOM000250636D
Publication Date: 2017-Aug-11
Document File: 6 page(s) / 757K

Publishing Venue

The IP.com Prior Art Database

Related People

Chandra Ganduri: AUTHOR [+4]

Abstract

According to standard circuit emulation service over packet switch network (CESoPSN) Pseudo Wires (PW), end-to-end latency is proportional to the attachment circuit (AC) bandwidth, especially for low bandwidth applications. However, low latency and time critical Pseudowire Emulation Edge-to-Edge (PWE3) application requirements are not addressed. The low latency structure-aware time division multiplexed (TDM) CESoPSN (LoLCESoPSN) PW system described herein supports the stringent low latency and time critical PWE3 application requirements, especially for low bandwidth PW restrictions. LoLCESoPSN may address, for example, low bandwidth and time critical smart grid application, voice, medical, financial, emergency response application requirements.

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Copyright 2017 Cisco Systems, Inc. 1

LOW LATENCY STRUCTURE-AWARE TIME DIVISION MULTIPLEXED CIRCUIT EMULATION SERVICE OVER PACKET SWITCHED NETWORK

AUTHORS: Chandra Ganduri Sriharsh Kulkarni

Vijaya Kumar Alamuru Dhiraj Kumar

CISCO SYSTEMS, INC.

ABSTRACT

According to standard circuit emulation service over packet switch network

(CESoPSN) Pseudo Wires (PW), end-to-end latency is proportional to the attachment

circuit (AC) bandwidth, especially for low bandwidth applications. However, low latency

and time critical Pseudowire Emulation Edge-to-Edge (PWE3) application requirements

are not addressed. The low latency structure-aware time division multiplexed (TDM)

CESoPSN (LoLCESoPSN) PW system described herein supports the stringent low latency

and time critical PWE3 application requirements, especially for low bandwidth PW

restrictions. LoLCESoPSN may address, for example, low bandwidth and time critical

smart grid application, voice, medical, financial, emergency response application

requirements.

DETAILED DESCRIPTION

The circuit emulation service over packet switch network (CESoPSN) Internet

Engineering Task Force (IETF) Request for Comments (RFC) 5086 standard dictates

Pseudowire Emulation Edge-to-Edge (PWE3) bandwidth based on attachment circuit (AC)

bandwidth in all stages of a path, such as at the pre-processing (PREP) and Interworking

Function (IWF) stages.

Figure 1 below illustrates a PWE3 network reference model. A Customer Edge (CE)

is a device at which one end of a service originates and/or terminates. The CE is not aware

when it uses an emulated service rather than a native service. The Provider Edge (PE) is a

device that provides PWE3 to a CE. The AC is the physical or virtual circuit connecting a

CE to a PE. The PREP stage includes an interface with a physical interface of any type and

Copyright 2017 Cisco Systems, Inc. 2

involves converting incoming data to digital data. The IWF stage segments and

encapsulates time division multiplexed (TDM) signals into CESoPSN packets and, in the

reverse direction, decapsulates CESoPSN packets and reconstitutes the TDM signal. The

Pseudo Wire (PW) is a mechanism that carries the essential elements of an emulated

service from one PE to one or more other PEs over a PSN. The PSN tunnel is a tunnel

across the PSN, inside which one or more PWs may be implemented.

Figure 1

The IFW stage preserves and monitors the bandwidth (number of NxDS0 channels)

over the PSN. The basic structure preserved across the PSN for this service consists of N

octets filled with the data of the corresponding NxDS0 channels belonging to the same

frame of the originating trunk(s), and the service generates 8000 such structures per second.

The CESoPSN must use alignment of the basic structures with the packet payload

boundaries in order to carry the structures across the PSN.

There are inherent limitations in the current standard. For example, the CESoPSN

(RFC 5086) standard specifies that for a low bandwidth AC of 64Kbps (for one...