This paper integrates sonet over ethernet thus creating compatibility between. Sonet and sdh define a set of physical layer standards for communications over optical fiber. Sonet was designed as a highspeed physical layer for transmission over fiberoptic links. Synchronous optical network sonet traffic is sent across a packet network. Cisco troubleshoot pos interface troubleshooting a pospacket over sonet interface is quite different than your standard ethernet interface. The following is a sample of the cisco pos shared port adapters available on the asr platform. Us6831932b1 transfer of sonet traffic over a packet. This application is very similar to the comboswitch. Pos is deployed in the line cards of gigabit and terabit routers and is implemented in hardware to handle wire speeds ranging from 51 mbs to 10 gbs.
With this mapping in place, all ietf protocols based. Pdf todays common and extensively used mac layers are sonet and ethernet. Synchronization in sonet networks the sonet homepage. Packetoversonet interface processor how is packetover. Introduction packet over sonet sdh pos is an emerging technology for carrying ip and other data traffic over the sonet sdh1 backbone. At first glance, pos looks ridiculous because of the price. These cisco products cannot sit directly on a sonet or sdh ring.
Tpop transparent pdh over packet smart sfp converts e1 or t1 also known as ds1 traffic to a packet stream using rfc4553 satop tdm over packet pseudowire technology. Packet over sonet sonet is a timedivision multiplexing tdm architecture that was designed to carry voice traf. Voice over ip, ip pbxs, videoconferencing and broadband video. Packet over sonet interface free download as pdf file. Packet over sonet was developed because there was no other way to transport data over a sonet network. Packet over sonet sdh pos has emerged as the technology of choice for highspeed routers as it enables efficient transmission of internet protocol ip packets directly over sonet sdh fiber. Which of the following is not a method for connecting pos to network media. Multiaccess protocol over sonet mapos is a highspeed, linklayer protocol that provides multiple access capability over sonet sdh. This means that a generic transport network must offer a synchronous transmission service free of. A brief overview of packet over sonet aps document id. Pos can be directly encapsulated onto the network media. In the days of low traffic volume between ip routers, bandwidth partitions over a common interface made it attractive to carry ip over a frame relay andor an atm backbone. Ep1926264b1 sonet adddrop multiplexer with packet over. Packetoversonet interface processor listed as posip.
Rfc 1619, ppp over sonet sdh, and rfc 1662, ppp in hdlclike framing. By inserting the plugandplay smart sfp in a free 10gbe port, any router or packet switch can be upgraded to support 2. In our paper, we will demonstrate that sonet and rpr could be integrated together. Synchronous optical networking sonet and synchronous digital hierarchy sdh are standardized protocols that transfer multiple digital bit streams synchronously over optical fiber using lasers or highly coherent light from lightemitting diodes leds. Nov 07, 2003 the cisco 15104 is an oc48 sonet regenerator that fits this application. Packet over sonet switch application guide cware software toolset, version 2. Fast access to key measurement tasks via smart test.
Cisco packet over sonet port adapters products cisco. Packet over sonet interface network packet computer network. The data structure is then converted into one or more packets and sent across the packet network. However, sonet and sdh use different terminology, which makes it difficult to talk about both at the same time. Variable length data packets are mapped directly into the sonet synchronous payload envelope spe. There are two main ways to enable synchronization over a pa cket network, synchronizing the packet network itself, as in the synchronous ethernet approach, or distributing the timing using the pa ckets as in microsemis timing over packet top technology. A ds0 is the voice line that is typically hardwired into homes. Packet over sonet to ethernet switch application guide cstapos2eugd rev 03 motorola general business information application feature overview the enetoc3switch application is a layer 23 switch that has 4 oc3c, 4 10100 ethernet and 1 gigabit ethernet port. To help optimize the transport of ethernet over sonetsdh links, two new technologies have been standardized. Relationship between ip and telecommunication networks. Both sonet and sdh can be used to encapsulate earlier digital transmission standards, such as the pdh standard, or they can be used to directly support either asynchronous transfer mode atm or socalled packet over sonet sdh pos networking. Oct 01, 2006 the working and protect circuits are synchronized themselves within each router or routers in which they terminate over an independent communication channel. A sonet transmission is decoded into a data structure. Unfortunately, the obvious problem with these proprietary approaches is that interoperability between various vendors equipment is difficult, if not impossible.
Packetoversonet pos is a standardized way for mapping ip packets into sonetsdh frames. Find out inside pcmag s comprehensive tech and computerrelated encyclopedia. Synchronous optical networksynchronous digital hierarchy sonetsdh. They are packet over sonet pos cards, which indicate serial transmission of data over sonet frames. Pdf this article deals with the synchronous optical network sonet. Ip over sonet october 27, 2008 abstract the explosive growth in internet traffic has created the need to transport ip on highspeed links. Access product specifications, documents, downloads, visio stencils, product images, and community content. Rfc 4842 synchronous optical networksynchronous digital. Applications for pospacket over sonet operation and. The working and protect circuits are synchronized themselves within each router or routers in which they terminate over an independent communication channel. Designed in conformance with the small form factor pluggable 20pin multisource agreement msa, tpop smart sfp can be used in any free. Packet over sonet how is packet over sonet abbreviated. Packet over sonet white paper pmc971161 issue 1 pmcsierra, inc. Cisco troubleshoot pos interface greg sowell consulting.
One of them must hang off of some ltelayer device, such as. Ethernet over sonet using a variety of proprietary approaches. This channel does not involve direct communication through the working and protect circuits. Packet over sonet to ethernet switch application guide. This independent channel can be a different sonet connection, or a lowerbandwidth connection. At low transmission rates data can also be transferred via an electrical interface. Packet over sonet sdh, abbreviated pos, is a communications protocol for transmitting packets in the form of the point to point protocol ppp over sdh or sonet, which are both standard protocols for communicating digital information using lasers or light emitting diodes leds over optical fibre at high line rates. Packet over sonet article about packet over sonet by the. By inserting the plugandplay smart sfp in a free 10gbe port, any router. Tdm architectures are not ideal solutions for transporting data. I will attempt to cover both sonet and sdh in this presentation. November 2004 prayson pate overture networks ron cohen editor lycium networks david zelig corrigent systems may 2004 sonet sdh circuit emulation over packet cep draftietfpwe3 sonet 07. Internet draft draftietfpwe3 sonet 10 february 2005 4 cep encapsulation format in order to transport sonet sdh circuits through a packet oriented network, the spe or vt is broken into fragments, and a cep header is prepended to each fragment. Packet over sonet is intended to transmit data at the highest rates possible, because sonet has a smaller packet header overhead than atm 28 bytes out of an 810byte frame compared with 5 out of.
The packet over synchronous optical network sonetsynchronous digital hierarchy sdh port adapter is a single port, singlewide oc3cstm1 pos port. I will talk mainly about sonet because you need to understand. Ip over sonet article about ip over sonet by the free. Packet over sonetsdh, abbreviated pos, is a communications protocol for transmitting packets in the form of the point to point protocol ppp over sdh or sonet, which are both standard protocols for communicating digital information using lasers or light emitting diodes leds over optical fibre at high line rates.