Pros and Cost of WAN technologies

BACK

PROS

 

 

CONS

 

        FRAME RELAY:
  • The use of Frame Relay is justified because although it is mostly implemented as a carrier-provided service it can also be used for private networks
  • Frame Relay can be used as an interface to either a publicly available carrier-provided service or to a network of privately owned equipment
  • Frame Relay multiplexing provides more flexible and efficient use of available bandwidth. Therefore, Frame Relay allows users to share bandwidth at a reduced cost.

 

        ISDN:

  • ISDN can carry a variety of user traffic signals.
  • ISDN provides access to digital video, circuit-switched data, and telephone network services by using the normal phone network which is circuit-switched.
  • ISDN offers much faster call setup than modem connections because it uses out-of-band (D, or delta, channel) signaling. For example, some ISDN calls can be setup in less than one second.
  • ISDN provides a faster data transfer rate than modems by using the bearer channel (B channel of 64Kbps). With multiple B channels.
  • ISDN offers users more bandwidth on WANs than some leased lines offer. For example, if you were to use two B channels, the bandwidth capability is 128Kbps because each B channel handles 64Kbps. ISDN can provide a clear data path over which to negotiate PPP links.

 

       T1 LINES

  • Very high performance - 1.5Mbps upload speeds and 1.5Mbps download speeds -
  • Very good reliability - The "full T1" service is unmetered.
  • There are no extra costs if you download large amounts of data.
  • There are almost no location restrictions on where a T1 service can be provided (as opposed to ADSL or LAN Extension)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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        FRAME RELAY:
  • Frame Relay  relays on upper layers for security
  • Frame Relay implementation could be expensive

 

 

 

 

 

 

 

        ISDN:

  • The main disadvantage of this method is the additional administrative overhead required to support the remote user
  • Security issues - Because network devices can now be connected over the Public Switched Telephone Network (PSTN), it is crucial to design and confirm a robust security model for protecting the network.
  • Dialup services, including ISDN, may have distance limitations particular to individual service providers.

 

 

 

 

 

 

 

 

 

 

 

 

 

        T1 LINES

  • More expensive then other access services.
  • Monthly and set up cost is high.

 

 

 

 

 

 

 

 

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