Next, the "slave" radio at the wellhead connects to a master serial radio at a repeater or backbone site
The lot contains links that connect the client~s backbone sites
via transparent ethernet services.
To maximize utilization of its fiber optic assets and enhance the resiliency, scalability, and flexibility of its broadband services, 1&1 Versatel has deployed the mTera in major backbone sites
across Germany and is currently extending deployment to its regional fiber optic networks.
Additionally, North Platte is a regional center for digital communications as the one of Network Nebraska's backbone sites
making it highly valuable in the distribution of regional internet and digital access.
* [S.sub.D] is the set of sites where the switch equipments can be installed; these sites also will be called potential switch sites or backbone sites
. The number of the switch sites is given by [n.sub.D] = [absolute value of [S.sub.D]].
In December 1997 there were 43 backbone sites
and 203 leaf sites registered.
Already Telecel has linked Gweru and Harare together with the backbone sites
along the way, and under the next phase we expect to cover other cities and urban areas like Bulawayo, said Alice Chikumbo, Telecel Zimbabwe s transmission manager.