Nortel Networks NN43001-121 - Manual (Page 107)

OCS Proxy server installation 107
Office Communications Server (OCS ) 2007 Enterprise Pool
OCS 2007 Enterprise Edition is designed for large-scale deployment where
multiple Office Communications Server Enterprise Edition servers are
deployed as a pool, typically behind a load balancer. Servers in the pool
share a central SQL back end database server that stores user data.
If your pool consists of more than one server, a Load Balancer is required. If
your pool consists of only one server, which is connected to a separate SQL
back end database server, a Load Balancer is not required.
OC clients register on an Enterprise pool. The client user is directed to a
specific server within the pool by a hardware load balancer that distributes
the load to these servers. Static data, such as contact lists and access
control lists (ACLs), are stored as persistent data on the back end database
server.
A client can have multiple concurrent connection instances and can register
on multiple servers at the same time. Each device to which the client is
logged on (called an endpoint) can be connected through a different server
at the same time.
The load balancer exposes a single Virtual Internet Protocol (VIP) address
that is used by the clients to access the pool. Each Enterprise Edition
server within the pool is responsible for connection processing, security and
authentication, protocol processing, and server applications. The user data
resides in the back end database server. The database contains records
that hold static data and dynamic user data (such as endpoints and active
descriptions for a user). The database runs a set of stored procedure calls
that form the core of the operational software. Office Communications
Servers within the pool are networked to the back end database server using
a high-speed network. These Office Communications Servers also run User
Replicator (UR) software to provide a connection to the Microsoft Active
Directory service so that user account information can be synchronized
between the back end database server and the Active Directory.
For more information about Office Communications Server 2007 Enterprise
Edition, see the Office Communications Server 2007 Document: Enterprise
Edition Deployment Guide. Download Microsoft technical documentation
from the Download Center at
www.microsoft.com .
OCS Proxy server installation
The following section describes the OCS Proxy server installation
procedures.
Nortel Communication Server 1000
Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
NN43001-121 01.03 Standard
Release 5.0 30 April 2008
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