This gives the service provider a presence at the customer location and
the ability to provide managed services. A protocol such as MultiLink Point-to-Point
(MLPPP) may be required in order to utilize the bandwidth on multiple TDM ports. If
the goal is simply to interconnect two LANs, this is an expensive and complicated solution
for a very simple task.
The second option is fiber based. This simple option bypasses any existing infrastructure.
An Ethernet extension device is installed at each enterprise location and an optical
fiber is patched together between the locations, as shown in Figure 10.10b. Major
issues include the fiber connectivity requirement and distance limitation.
Figure 10.10 IP Router with TDM ports
NEXT GENERATION SONET/SDH TRANSPORT NETWORK
(a) Router with TDM ports
(b) Ethernet extension over fiber
(c) Ethernet utilizing MSPP
SONET/SDH TRANSPORT NETWORK
ADM
ADM
Service
provider
router
Service
provider
router
ADM
MSPP MSPP
MSPP
Optical
transceiver
Optical
transceiver
TDM: Circuit Bonding 285
A third option is based on a multi-service provisioning platform (MSPP). The MSPP is
basically a Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy
(SDH) Add/Drop Multiplexer (ADM) designed to support standard TDM services as
well as data services such as Ethernet.
Pages:
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684