basic wan technology
TRANSCRIPT
-
8/12/2019 Basic WAN Technology
1/27
Basic WAN Technology
Priya G
-
8/12/2019 Basic WAN Technology
2/27
WAN (Wide Area Network)
A Wide Area Network(WAN) is a computer
network covering multiple distance areas,
which may spread across the entire world.
WANs often connect multiple smaller
networks, such as local area networks (LANs)
or metro area networks (MANs).
-
8/12/2019 Basic WAN Technology
3/27
WAN Terms
Customer Premise EquipmentThese
Equipments should be managed by
customer.
-
8/12/2019 Basic WAN Technology
4/27
WAN terms continued
A CSU/DSU(Channel Service Unit/Data Service Unit) is
a digital-interface device used to connect a DTE, such
as a router, to a digital circuit, such as a T1 line.
The CSU/DSU implements twodifferent functions.
The Channel Service Unit (CSU)
receives and transmits signals from
and to the WAN line and provides a
barrier for electrical interference from
either side of the unit.
CSU provides echo signal from
telephone company for testing
purposes.
The DSU manages timing errors and
signal regeneration
-
8/12/2019 Basic WAN Technology
5/27
WAN terms continued Fig: Outdoor Demarcation Point
Demarcationrefers to the point of lastresponsibility for the service provider.
The modern demarcation point is
the network interface device (NID).
A two-port or four-port patch-panel
will be used as a physical Demarc.
Fig: Indoor Demarcation Point
-
8/12/2019 Basic WAN Technology
6/27
WAN Terms continued
The Smart Jack physically terminates the T1 line. If there is a connectivity
issue, the provider will perform a ping test to thesmart jack.
If communication to the smart jack is successful, the provider will assume
the issue resides on the customersside of responsibility.
The smart jack is often locked in a glass enclosure, and labeled with the
T1scircuit number.
In telephony, the local loop (also referred to as a subscriber line) is the
physical link or circuit that connects from the demarcation point of
the customer premises to the edge of the common
carrier or telecommunications service provider's network.
-
8/12/2019 Basic WAN Technology
7/27
WAN connection types
Point-to-Point Technologies
Circuit Switched Technologies
Packet Switched Technologies
-
8/12/2019 Basic WAN Technology
8/27
Leased Line Technology
Point-to-Point connection between two computers or Local
Area Networks (LANs).
Advantage:
Most Secure
Guaranteed bandwidth
Disadvantage:
Expensive
Eg: PPP, HDLC
-
8/12/2019 Basic WAN Technology
9/27
Circuit-Switched Technology
A connection between 2 stations is a dedicated path made of
one or more links.
Three phases:
Setup phase Data Transfer phase
Teardown phase
-
8/12/2019 Basic WAN Technology
10/27
Circuit Switching
-
8/12/2019 Basic WAN Technology
11/27
Advantages:
less expensive
DrawbackLack of efficiency in using resources
Eg: ISDN, Dial-up
-
8/12/2019 Basic WAN Technology
12/27
Packet-Switched Technology
Devices transport packets via a shared single point-to-point or
point-to-multipoint link across a carrier internetwork. Before
information can be exchanged between two end points, they
first establish a Virtual Circuit.
Advantage:
Better EfficiencyDisadvantage:
delay
shared media across link
Eg: X.25, Frame-relay, ATM,
-
8/12/2019 Basic WAN Technology
13/27
Packet Switching
-
8/12/2019 Basic WAN Technology
14/27
WAN Link Options
-
8/12/2019 Basic WAN Technology
15/27
-
8/12/2019 Basic WAN Technology
16/27
Analog Dialup
-
8/12/2019 Basic WAN Technology
17/27
ISDN
-
8/12/2019 Basic WAN Technology
18/27
ISDN
Router with
standard serial
interface,
connected to a
terminal adapter
Router with native
ISDN BRI U or S/Tinterface or PRI
-
8/12/2019 Basic WAN Technology
19/27
Leased Line
Leased lines are not only used to provide direct point-to-point connections between Enterprise LANS, they can
also be used to connect individual branches to a packet
switched network.
-
8/12/2019 Basic WAN Technology
20/27
WAN with X.25
X.25 provides a low bit rate,shared-variable capacity that may
either be switched or permanent
-
8/12/2019 Basic WAN Technology
21/27
Frame Relay
Most Frame Relay connections are based on PVCs rather thanSVCs.
It implements no error or flow control. This leads to reducedlatency.
Frame Relay provides permanent shared medium bandwidth
connectivity that carries both voice and data traffic.
-
8/12/2019 Basic WAN Technology
22/27
ATM
Asynchronous Transfer Mode (ATM) is a technologycapable of transferring voice, video, and data throughprivate and public networks.
It is built on a cell based architecture rather than on aframe-based architecture.
-
8/12/2019 Basic WAN Technology
23/27
DSL
DSL uses existing twisted-pair telephone lines to
transport high-bandwidth data DSL service is considered broadband, as it uses
multiple frequencies within the same physicalmedium to transmit data
-
8/12/2019 Basic WAN Technology
24/27
ADSL Technology
Splitter
The local loop connects the splitter to the DSLAM
DSLAM connected to ISP using ATM technology
Voice and data use separate frequency ranges (voice
0-4Khz, data 20Khx 1Mhz)
-
8/12/2019 Basic WAN Technology
25/27
Cable Modem
Enhanced Cable Modems enable two-way.
High speed data transmissions using the same
coaxial lines that transmit cable television.
-
8/12/2019 Basic WAN Technology
26/27
Cable Data Network Architecture
-
8/12/2019 Basic WAN Technology
27/27
Modern WAN