Single (converged) access for all services In a typical enterprise, there are usually
multiple discrete connections to the Service Provider, each of them delivering a different
voice or data service. As shown in Figure 1.12, it is fairly common for a mid-size
enterprise to employ different physical connections and transport technologies such as
TDM, ATM, and Frame Relay, for its voice, storage, and other data traffic. The reason
for this type of setup is largely historical evolution, and a function of how these different
services were(are) delivered by Service Providers. This multiple-access approach
presents several problems for the end user:
?– There is additional cost and manageability associated with the expensive equipment.
?– There is no opportunity to optimize bandwidth or the manageability of services
internally.
?– Each of these different connections requires truck-rolls43, which translates in to
delays for the enterprise
Often a SONET ADM node is used to support these multiple connections??”an expensive
proposition. These multiple discrete connections are inherently inefficient and
cannot optimize the total bandwidth required by the enterprise: if a specific service on a
discrete connection uses less bandwidth than provisioned, then the unused bandwidth
cannot be used by any of the other services.
Pages:
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151