WAN Network Protocols - DSL, SONET, HDLC, DWDM, DLSW+

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This article describes the implementation of protocols in the WAN enterprise network environments today HDLC, DSL, SONET, DWDM and DLSw +

High level Data Link Control (HDLC)

HDLC is a Cisco proprietary protocol designed to send data over serial links. It defines an encapsulation method for data link layer for transporting data over a public or private network. This protocol is used toTDM leased line. TDM circuits are probably the oldest types of circuits from circuit switching technology developed by the Public Switched Telephone Network carries traffic that uses the phone. The difference is that companies need to carry data traffic speed model 256 Kbps to 45 Mbps is just a circuit that requires the data at the beginning and at the end, what a phone line for conditioning and formatting data for these speeds.

The TDM network is working withSteps called digital signal zero (DS-0). A DS-0 is a 64 kbps channel (56 kbps, when in-band signaling), is the part of the DS-1 specific industry standards. A DS-1 defines a standard for the design of transmission on a T1 circuit at 1.544 Mbps with 24 channels DS-0. A DS-3 standard defines a frame for transmission over a circuit T3 44.736 Mbps with 28 channels DS-1. Some service providers offer what is called fractional T1 (Frac T1). It 'a circuit that operates at a lower speed1,544 Mbps as well, as there is a subset group of 24 channels.

The common fractional T1 speeds of 384 Kbps, which is composed of six DS-0 channels. Many routers have a serial interface function, the shared channel or a T1 circuit. This is useful if you do not want to pay for a full T1 circuit. This is done by differentiating each specific channel full T1 circuit. Europe is called something other than standard circuit speed E1and E3. The E1 circuit is composed of 30 channels DS-0and operates at 2.048 Mbps, while E3 is made up of 20 T1 channels and operates at 34.368 Mbps.

Digital Subscriber Line (DSL)

Digital Subscriber Line is one of the latest broadband technologies that are used for remote access and dial-office. It 'very affordable when compared with ISDN and T1circuits, because it is faster and less expensive. The problem with DSL is that it should not be higher than 18,000 feet from the center service provider. The demand forHigh-speed Internet access service is the installation of DSL equipment on many key points. This increases the chances of availability in your area, if it is not an option today. The current specification defines three key technologies, asymmetric DSL (ADSL), Very High Data Rate DSL (VDSL) and symmetric DSL (SDSL) are.

Asymmetric DSL (ADSL), as the name implies, is the ADSL technology, which allows higher speeds downstream of theService provider for the customer to the upstream speed from client to service provider. The project corresponds to the flow of Internet and video applications, because usually the customer to download more information and will not send them. Depending on the distance from the service provider's central downstream speeds can be faster than 6 Mbps and upstream speed can be up to 640 Kbps as a conservative with bridge taps and wire diameter greater(Pressure) will increase the speed of transmission from client to service provider.

The ADSL modem or router at the customer with a standard 2-pair telephone line for service provider DSL Access Multiplexer (DSLAM) terminates interface. At this point, the service of their DSLAMs interconnection with a variety of different devices, such as T1, T3, SONET, Frame Relay, ATM or DSL circuits for transmission over the Internet or to another office.As already mentioned, some customers for sharing the ADSL line to use their phone as well. The DSLAM is removed from the data traffic and voice traffic is routed, a Class 5 switch, which is sent over the PSTN via a protocol such as SS7. Many enterprise customers a line for additional data, the increase in costs, however, when the number is not available, has decided to no impact on their Internet connection.

Very High Rate DSL (VDSL) is greaterspeed DSL specification that will transmit data at distances between 1,000 feet and 4,500 feet across copper telephone lines. Distances of approximately 1000 feet will support speeds of 55 Mbps while distances of 4,500 feet will support an approximate speed of 12 Mbps. There are some technical differences with line encoding however the modem will split off the telephone service as does ADSL for phone calls.

Symmetric DSL (SDSL) is somewhat new and as the name suggests transmits data in both directions at T1 speeds. The distance specification from the central office is 21,000 feet and it should be noted that there must be a separate phone line since SDSL won't split off phone traffic. That is currently an issue that is being addressed and should be available this year. SDSL is an always-on service, which reduces the issues with call setup. That and the higher upstream traffic rates make it better suited for web hosting applications since your file downloads sent with downstream traffic is sent with their upstream traffic. There are tremendous opportunities for service providers to sell cost effective high speed Internet access to many clients across the United States today. Telecommuters and business clients can reduce costs with higher speed circuits for sending voice and data from home, access and distribution offices across the Internet.

SONET/SDH

The Synchronous Optical Network (SONET) specification describes a high speed fiber technology used by service providers for transporting voice and data traffic. A SONET network is built with a series of ring segments that are inter-connected. Each SONET segment is comprised of dual counter rotating rings for link diversity should one of the rings be unavailable. The standard OC-1 interface is 51.8 Mbps. The SONET network ring is built with Add/Drop Multiplexers (ADM) which terminate the SONET signal at various metropolitan and national locations. They are Time Division Multiplexers that mux/demux SONET signals from an OC-12 to OC-48 traffic stream. Each ADM has an active and a standby connection to the SONET ring. When a network failure with the active connection is detected, the standby connection is immediately activated. The SONET frame structure is 810 bytes that is comprised of overhead and payload bytes. The overhead is comprised of section and line signaling. The payload bytes are comprised of path signaling and payload. Customer routers such as the Cisco 7507 that support OC-3 interfaces that can interface with an ADM.

Dense Wave Division Multiplexing (DWDM)

Dense Wave Division Multiplexers (DWDM) are used to multiplex optical signals at various wavelengths onto a single fiber strand for transport across an optical network at speeds from OC-48 to OC-192. Each wavelength can run at speeds of up to 10 Gbps. Current optical systems can multiplex as many as 100 wavelengths or channels per fiber strand which is almost 1 Terabit (1000 Gbps) aggregate speed. Current efforts are focused on developing multi-terabit transport on 1 fiber strand. This technology is somewhat of a demarcation between the fastest enterprise core networks and the long haul ISP core networks which aggregate hundreds of enterprise customers. The enterprise customer can connect with DWDM networks using ATM switches and IP routers with OC-48 interfaces. Public and private SONET network providers have rings that connect using equipment with interfaces running at OC-48 speeds as well. The Cisco 12016 Gigabit switch router is available with OC-48 interfaces. Companies today are utilizing 400 OC-48 router interfaces at the 12016 to build a Terabit WAN core.

Data Link Switching (DLSW+)

Data Link Switching is a Layer 2 protocol used for encapsulating SNA frames across an IP WAN. It is an IP encapsulation method that integrates SNA workstations and servers with the IP enterprise network. Encapsulation of SNA is required since there is no Layer 3 addressing defined with its protocol stack. Routers that are configured with DLSW+ will establish peer relationships with local and remote DLSW+ routers. Each SNA Frame is encapsulated in an IP packet before it is sent across the WAN to a peer router configured with DLSW+. Each local router will terminate LLC2 data link layer frames from each workstation and send local acknowledgments to each local workstation as packets are sent and received. That eliminates LLC2 timeout issues that can occur between workstation and server when acknowledgments must travel across a congested WAN circuit.

SNA is connection-oriented and must receive data link acknowledgments every few seconds or the session will timeout. Bridge protocols such as Source Route Bridging (SRB) limit the number of bridges and rings that an SNA packet can span. There is no issue with the number of Rings utilized with DLSW+ since the RIF field is terminated at the router. DLSW+ integrates many different data link technologies such as Ethernet, Token Ring, SDLC and Frame Relay. There is a translation as well between different frame types such as Ethernet and Token Ring at each router for those data link technologies. Promiscuous mode is configured at DLSW+ routers which allows for many connections from remote peer routers. An example would be 7500 Data Center routers that have peer connections from many distribution offices.

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network routing protocols - IGRP, EIGRP, OSPF, ISIS, BGP

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The purpose of routing protocols are the routes available, learn to exist in the corporate network to build routing tables and routing decisions. These are some of the most common routing protocols are RIP, IGRP, EIGRP, OSPF, BGP and IS. There are two main types of routing protocol, although many different routing protocols defined by these two types. protocols and link state vector types include primary distance. Distance Vector ProtocolsAdvertising their routing table to all directly connected neighbors at regular intervals, with a lot of bandwidth and are slow to converge. If a route becomes unavailable, all router tables are updated with new information. The problem is to advertise with any router with new information to its neighbors, it takes a long time for all routers of a current network is a closer look. Distance Vector protocols use the subnet mask of fixed length which are not scalable.Link State routing protocols advertise updates only when the bandwidth more efficiently. Advertising router does the routing table convergence faster. The routing protocol will converge the network with link-state advertisements to all routers adjacent area in an attempt to flood the network with new route information. A gradual change is all that is advertised to all multicast router LSA as an upgrade. Use variable length subnet masks, whichexploit scalable and efficient routing.

Interior Gateway Routing Protocol (IGRP)

Interior Gateway Routing Protocol is a distance vector routing protocol developed by Cisco Systems for network routing protocols over many small and medium enterprises Cisco. And 'owner requires use of Cisco routers. This contrasts with IP and IPX RIP RIP Designed for multi-vendor networks. IGRP route IP, IPX, and DECnetAppleTalk protocol, which makes it very versatile for different clients. It's more scalable than RIP hop count of 100 because it supports, promotes only every 90 seconds and uses a mixture of five different parameters for a destination best. Note that point, because IGRP announced less frequently, but uses less bandwidth RIP converges much more slowly, because 90 seconds before the router IGRP are known to the changes of network topology. IGRP does not recognizeAssigning different autonomous systems and the network automatically combined class boundaries. Similarly, the possibility exists to compensate for the traffic over equal or unequal cost load paths metric.

Statistics

· Distance vector

· Itineraries IP, IPX, DECnet, AppleTalk

° Table routing display every 90 seconds

· Metric: bandwidth, delay, reliability, load, MTU size

· Hop Count: 100

· FixedLength subnet mask

· Compression Class Network Address

Balance load · over 6 cost the same or different routes (IOS 11.0)

· Metric = BW * destination path in the shortest possible time (USEC)

Splitting · Horizon

· Timer: invalid timer (270 sec), thread-timer (630 sec), hold-down timer (280 sec)

Enhanced Interior Gateway Routing Protocol (EIGRP)

Enhanced Interior Gateway Routing Protocol is a hybridnetwork routing protocol developed by Cisco Systems for many routing protocols in a company, Cisco. It has features of both distance vector routing protocols and link state routing protocols. And 'owner requires use of Cisco routers. EIGRP route is the same protocols, IGRP routes (IP, IPX, DECnet and AppleTalk) and use the same IGRP composite metric to choose the best route to a destination. Similarly, there is a possibility of load balancingTransport costs are the same or different paths metric. Compaction is a class A address network but can be configured to automatically summarize subnet boundaries, e. Redistribution between IGRP and EIGRP is automatic as well. There is support for a hop count of 255 and variable length subnet mask.

Convergence

EIGRP convergence is faster because it uses an algorithm called Dual-update algorithm or DUAL, which is run is used when a router detects that aparticular path is not available. The router queries its neighbors in search of a possible successor. This is like a neighbor with a lower cost path to a destination, so no routing loops defined. EIGRP is its routing table with the new route and update associated metrics. route changes are applied only to the affected router, when changes occur. It uses the bandwidth more efficiently than Distance Vector routing protocols.

Autonomous Systems

EIGRP does not recognize the assignment of different autonomous systems, processes running under the same administrative domain routing. Assigning a different autonomous system number is not to define a backbone as OSPF. With IGRP and EIGRP route change for redistribution, filtering and compression points.

Statistics

· Search Advanced distance vector

· Itineraries IP, IPX, DECnet, AppleTalk

· RoutingView: Partial If there are changes of direction

· Metrics: bandwidth, delay, reliability, load, MTU size

· Hop Count: 255

Variable · Length Subnet Mask

· Compression on network address or subnet Class Boundary

Balance load · over 6 cost the same or different routes (IOS 11.0)

· Timer: active time (180 sec)

· Metric = BW * destination path in the shortest possible time (ms) * 256

· DemergerHorizon

Multicast LSA · Address: 224.0.0.10

Open Shortest Path First (OSPF)

Open Shortest Path First protocol is a true link-state as an open standard for IP routing largest multi-vendor networks developed. A link state protocol link-state advertisements send to all connected neighbors of the same area to communicate route information. Each OSPF router active when it starts, the Hello packets sent to all OSPF routers connected directly. TheHello packets contain information such as routers Timer, Router ID and subnet mask. If the routers agree on the information that become OSPF neighbors. Routers become neighbors as soon as it is adjacent by exchanging link-state databases. Routers over point-to-point and point-multipoint connections (such as OSPF interface type setting noted) adjacencies automatically. OSPF router interfaces configured as a broadcast (Ethernet) and NBMA (Frame Relay) is designatedRouter adjacency sets.

Areas

OSPF uses a hierarchy with assigned spaces, which connects to a main backbone routers. Each area is characterized by one or more routers that have formed adjacencies defined. OSPF backbone area 0, area stub, the not-so-stubby areas and opaque areas completely defined. Area 0 is connected with a group of routers in a particular office is established or WAN connections over several locations. It 'better to have all the router area 0combined with a full-mesh with an Ethernet segment to a central office. This provides high performance and prevents the range of partitioning a router connection should fail. Area 0 is a transit zone for the whole movement-related areas. Each inter-area traffic must first route through the range of 0. stub area use a default route traffic to an external network such as routers EIGRP as the boundaries of the region not to send or receive, certainly not outside paths. Inter-and intra-area routing areais as usual. Totally stubby areas are a Cisco specification, which addresses use a default path for inter-and external field. The ABR does not send or receive external LSA or inter-zone. The ABR-so-stubby area does not advertise external routes with type 7 LSA. Additional routes are not addressed in this area damage. Inter-and intra-area field is sent as usual. Defined internal OSPF routers, backbone routers, area border routers (ABR) and Autonomous System Boundary Router (ASBR).interior routers are specific to a sector. Area border routers have interfaces that are assigned to more than one area, such as the range between 0 and 10 range. An autonomous system border router has assigned interfaces OSPF and another routing protocol such as EIGRP and BGP. A virtual connection is used when an area is not a direct connection between 0 A virtual link between area border router for an area that is not connected to area 0 set, and an area border router for an areawhich is connected to area 0. Area design involves taking into account geographic location of offices and traffic flow throughout the enterprise. It 'important to be able to summarize addresses for many offices to the area and minimize broadcast traffic.

Convergence

fast convergence with the SPF (Dijkstra) algorithm, which achieves a shorter path from source to destination. The routing table is the implementation of SPF, all paths established by the neighbors builtRouter. Because each router has a copy of the OSPF topology database and routing table for its particular field, are the paths of changes identified faster than distance vector protocols and alternative routes are detected.

Designated Router

Broadcast networks such as Ethernet and non-broadcast multi-access networks such as Frame Relay has a designated router (DR) and backup designated routers (BDR), which are selected. Designated establish adjacencies with Routerall routers in this network segment. This should be reduced to broadcasts from all routers regularly send Hello packets to its neighbors. The DR sends multicast packets to all routers with which it has established adjacencies. If the DR fails, BDR is sending to the multicast router specific. Each router is a router ID, the highest IP address assigned is assigned to an interface working. OSPF uses the router ID (RID) for all routing processes.

Statistics

· Link State

• IP Routes

Routing ° view: partial change of direction occurs when

· Metric: Composite cost of each router to the destination (100,000,000 / interface speed)

Earl Hop: None (Network Limited)

Variable · Length Subnet Mask

· Compression on network address or subnet Class Boundary

Load · balance between cost of four paths

Route · Types: internalBackbone, ABR, ASBR

· Types Area: spine, Stubby, Not-So-Stubby, Totally Stubby

LSA · Types: intra-field (1.2) Inter-field (3.4), outdoor (5.7)

· Timer: Hello Interval and Dead Interval (different network)

· LSA multicast address: 224.0.0.5 and 224.0.0.6 (DR / BDR) no filter!

· Types of interfaces: point to point, broadcast, non-broadcast, point to multipoint, Loopback

Integrated IS-IS

Integrated Intermediate System - Intermediate System Routing Protocol is a link state protocol such as OSPF, which is used by large enterprises and ISP customers. An intermediate solution is a router and IS-IS routing protocol packets between intermediate systems. IS-IS uses a link-state database and Dijkstra SPF algorithm leads to the shortest paths to choose routes. router to the next point to point and point-multipoint connections, adjacent plantSending Hello packets and exchange of link-state databases. IS-IS routers broadcast and NBMA networks, choose a designated router adjacencies with all routers that produces neighbors in this network. The designated router and each router is a neighbor adjacent to neighboring routers for multicasting link-state advertisements to the network. This is different from OSPF adjacency between the DR and any neighboring router only firmly. IS-IS uses a hierarchicalthe structure of the fields with level 1 and 2 types routers. Level 1 routers are similar to intra-area OSPF routers that have no direct connections outside of their region. Level 2 includes the area of backbone routers, the various sectors, such as OSPF area 0 links with the IS-IS router is a L1/L2 router as an OSPF Area Border Router (ABR), compounds capable with its surroundings and the area has is its backbone. The difference with IS-IS, is that the links between routers include the border areaand not the router. Each IS-IS router must be assigned an address that is unique for the domain routing. An address format used, which is part of an area ID and system ID. The area is the ID number assigned to the field and the system ID is a MAC address from router interfaces. There is support for variable length subnet mask, which is compatible with all standard link-state protocols. Note that the IS-IS routing process to an interface instead of aNetwork.

Statistics

· Link State

• The routes IP CLN

· Advertising Routing occur: partial routing changes when

· Metric: variable costs (standard costs assigned to each port 10)

· Hop Count: None (limited by the network)

Variable · Length Subnet Mask

· Compression on network address or subnet Class Boundary

Balance load · cost of more than 6Routes

· Timer: Interval Hello, Hello Multiplier

· Types Area: hierarchical topology is similar to OSPF

· Types Course: Level 1 and 2

· Types LSP: Internal L1 and L2, L2 external

° design Router election, not BDR

Border Gateway Protocol (BGP)

Border Gateway Protocol is an exterior gateway protocol, which is for the interior gateway protocols discussed so far. The distinction isimportant, since the term autonomous system is a bit 'different, with the protocols used, such as EIGRP, as with BGP. exterior gateway protocols like BGP route between autonomous systems that a particular AS number are assigned. AS numbers can be assigned to an office with one or more BGP routers. The BGP routing table is the destination IP address, the associated AS-path to this goal included to reach a deal and next hop router. AS-Path is a set of AS numbersprovide that each office involved with routing packets. Compare used with the EIGRP autonomous systems as well. The difference is their autonomous systems refer to a logical grouping of routers within the same administrative system. You can configure many network EIGRP autonomous systems. They are all operated by the company to define route summarization, redistribution and filtering. BGP is a set of Internet Service Providers (ISPs) and businesses that use large enterprisesDual homed Internet connections with single or dual-homed router for the same or different ISPs. BGP routing packets on a network of ISP, a separate routing domain is managed by them. The ISP has assigned its own AS number that is assigned by InterNIC. New customers can request either an AS-assignment to serve as your ISP or the InterNIC. AS number assignment is only for customers when they need a connection with BGP. There are 10 listedThe attributes that determine a particular order or sequence that BGP is used as a parameter to determine the best route to a destination. Companies with only a connection to an ISP circuit will implement a default route on your router, which transmits all packets destined to an external network. BGP routers distribute routing information (peering) with all the routers on the network IGP (EIGRP, RIP, OSPF, etc.) involving the exchange of complete routing tables. Once these are done, is incrementalUpdates will be posted with the topology changes. Each BGP router can be configured to filter routing broadcasts with line cards instead of sending / receiving the entire Internet routing table should be.

BGP routing table Component

° IP destination address / Subnet Mask

· How-Path

· Next Hop IP Address

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Protocols WAN - DSL, SONET, HDLC, DWDM, DLSw +

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This article describes some of the protocols in the WAN network environments today HDLC implemented business, DSL, SONET, DWDM, and DLSw +

High Level Data Link Control (HDLC)

HDLC is a Cisco proprietary protocol designed for sending data over serial links. It defines a method in which the data link layer encapsulation for data transport on a public or a private network. This protocol is used toTDM leased line circuits. TDM circuits are probably the oldest types of transition from circuit switching technology by the public telephone network, the use of phone is used. The difference is that companies carry data traffic requiring switching speed of 256 Kbps to 45 Mbps is a circuit, the data requires only the beginning and end, what a phone line for conditioning and formatting Data for these speeds.

The TDM network to operateSteps called digital signal zero (DS-0). A DS-0 is a channel of 64 Kbps (56 kbit / s, if in-band signaling is used), which is part of DS-1 field in the standard configuration. A DS-1 defines a standard for the design of transmission over a distance of 1.544 Mbps T1 with 24 channels DS-0. A DS-3 defines a standard for the design of transmission over a distance of 44.736 Mbps T3, DS-1 with 28 channels. Some service providers offer what a fractional T1 (Frac T1). And 'circuit that operates at a lower speedof 1.544 Mbps, as there is a subgroup of the group of 24 channels.

The common fractional T1 speeds 384 Kbps, 6 channels DS-0 is included. Many routers serial interfaces have a function, split-channel or a T1 circuit. This is useful if you do not want to pay for a full T1 circuit. This is done by differentiating each specific channel from full T1 circuit. Europe is called something other standard speed circuit E1and E3. The E1 circuit from 30 DS-0Channels and operates at 2048 Mb / s, while E3 is composed of 20 T1 channels and runs at 34.368 Mbps covers.

Digital Subscriber Line (DSL)

Digital Subscriber Line is a broadband technology, the latest will be used for remote access dial-up access and office. It 'very convenient compared with ISDN and T1circuits, since it is faster and less expensive. The problem with DSL is that you no longer than 18,000 feet must be found by the service station. TheThe demand for Internet access providers high-speed DSL service has installed devices to many key posts. This increases the chances of availability in your neighborhood, if today is not an option. The current specification defines three key technologies, Asymmetric DSL (ADSL), Very High Data Rate DSL (VDSL) and Symmetric DSL (SDSL).

Asymmetric DSL (ADSL), as the name suggests, is the ADSL technology allows fasterspeed downstream service provider to the customer than the upstream speed from client to service providers. The project corresponds to the flow of the Internet and video applications, since they usually have customers send more information to download. Depending on the distance from headquarters to service downstream speed can be faster than 6 Mbit / s upstream speed can be up to 640 kbps. His conservative with bridge taps andlarger wire diameter (gauge) is also the rate of traffic from client to service providers.

The ADSL modem router or client) interface with a standard telephone line pair 2, DSLAM (the termination of the service provider DSL Access Multiplexer at this point. The service cross-connect their DSLAM with a variety of different devices such as T1, T3 , SONET, Frame Relay, ATM or DSL circuits for transmission over the Internet or on adifferent locations. As stated, some customers will use to line sharing ADSL phone and their calls. The DSLAM is split by voice traffic and data traffic to a switch in Class 5, where it is sent over the PSTN using a protocol such as SS7. many business people connect clients opt for a line of further data, the Internet, which increases the cost, however, if the line item is not available, do not concern them.

Very high rate DSL(VDSL) exceeds a specific speed ADSL, telephone lines transmit data at distances between 1,000 meters and 4,500 meters of copper. Distances of about 1000 feet supports speeds of 55 Mbps, while supporting distances of 4500 meters an approximate speed of 12 Mbit / s. There are some technical differences with the line coding, but the modem is the elimination of telephone and ADSL.

Symmetric DSL (SDSL) is something newand as the name suggests, the data transfer in both directions at speeds of T1. The specific distance from headquarters is 21,000 feet, and it should be noted that there is a separate phone line for SDSL will not be severed telephone traffic. This is currently an issue that is addressed, and in this year. SDSL is a service that reduces the always-on connection problems. And the highest rates of upstream traffic to make it more suitable for web-hostinglike downloading files with the downstream traffic is sent with the hand on the upstream traffic. There are huge opportunities for suppliers of marketing services, now have access to affordable Internet access-high speed to many customers in the United States. Telecommuters and business customers to reduce costs at home with a top speed of circuits for transmitting voice and data, use and distribution offices via the Internet.

SONET / SDH

TheSynchronous Optical Network (SONET) specification describes a high-speed fiber service providers of technology to carry voice traffic and data used. A SONET network is constructed with a series of segments, the ring is connected. Each segment is dual SONET rings counter for a diversity link rings should not be available. The standard OC-1 interface is 51.8 Mbps SONET ring network is built with add / drop multiplexers (ADM) that terminate the SONETSignal at various locations national and metropolitan regions. Are time-division multiplexer MUX / DEMUX signals from a SONET OC-12 OC-48 traffic flow. Each ADM has an active and a standby connection to SONET ring. If a power failure is detected with the active compound, the waiting connection is activated immediately. The structure of the SONET frame is 810 bytes, the overhead and payload bytes is included. The overload is the section and line signals includes. The payloadBytes way of signaling and payload are together. Customers like Cisco 7507 that support OC-3 interfaces, ADM with a CAN interface.

Dense Wave Division Multiplexing (DWDM)

Dense Wave Division Multiplexer (DWDM) are used for optical signals at different wavelengths over a single wire multiplex fiber to transport optical network with a speed of 48 to OC-OC-192. Each wavelength can speed up to 10 Gbit / s performance. Recent opticalMultiplex can have up to 100 wavelengths or channels per strand of fiber, nearly a Terabit (1,000 Gbps), the rate of aggregation. Recent efforts on developing multi-terabit traffic on 1 filament fiber concentration. This technology is a sort of demarcation between corporate networks faster and basic long-ISP core networks, which total hundreds of enterprise customers. Enterprise customers can connect with DWDM networks using ATM switches and IP routers with OC-48Interfaces. Public and private network operators SONET rings that connect using devices with interfaces are running at OC-48 speeds as well. The Cisco 12016 Gigabit Switch Router with OC-48 interfaces. Companies today are 400 OC-48 router interfaces to use 12,016 to build a WAN terabit core.

Data Link Switching (DLSw +)

switched data link is a layer 2 protocol used to encapsulate SNA frames over a WAN IP.It is a method, workstations and IP encapsulation SNA Server integrated with the corporate IP network. The encapsulation of SNA is necessary because it does not define a Layer 3 address the protocol stack. Routers using DLSw + is configured to establish peering relationships with local and remote DLSw + routers. Each SNA frame is encapsulated in an IP packet before a WAN router DLSw + peering with cleverly configured. Each end routers local LLC2 Data Link LayerFrames from each local workstation and send confirmations for each local workstation as packets are sent and received. This eliminates the time-out LLC2 problems that can pass between Workstation and Server, if the confirmation should occur during a trip congested WAN circuit.

SNA is a connection and data connection should confirm within a few seconds or the session will timeout. Bridge protocols such as Source-Route Bridging (SRB) limiting the number of bridges and rings, a package SNAmay extend. There is no problem with the number of rings as the DLSw + RIF field is used set to the router. DLSw + integrated many different data-link technologies such as Ethernet, Token Ring, SDLC, and Frame Relay. This is a translation, as well as between different types of frames, such as Ethernet and Token Ring to any router for networking technologies such data. promiscuous mode DLSw + router is configured to allow connections to many remote peer router. An example would be7500 data center routers that peer connections from many sales offices.

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