Specifications

10 Reference Architecture | Dell
TM
Unified Communication Solution with Microsoft® Lync® Server 2013 for Single Site
Implementation | Version 1.0
through simple URLs. Some of these features include meeting content downloads, address book
downloads, location information and Lync Web App. HTTP and HTTPS traffic is routed to the Reverse
Proxy, which then forwards the requests to the Front End Server.
2.1 Lync 2013 Standard Edition with Backup Registrar Pool
Microsoft Lync Server 2013 provides the option of using paired Standard Edition pools, one as the primary
registrar and the second as the backup registrar. In cases with relatively small user counts, a Standard
Edition server with backup registrar provides sufficient availability at lower cost. In the event of a primary
registrar failure, ongoing calls still continue, but Lync clients display a “limited functionality” message.
In Lync Server 2013, when a Standard Edition Server is specified as a backup registrar in a paired Standard
Edition pool, a new service called the Lync Server Backup Service is installed. This service provides real-
time data replication to keep the pool synchronized. Replicated data includes user information, contacts,
conferencing data and other information stored within the SQL Express database. When the Front End
service is non-functional on the primary server, users fail over to the backup registrar with limited features.
The most notable feature limitation is the lack of presence status (Available, Busy, In a meeting, etc.) on
the Lync clients. When the IT administrator becomes aware of the Front End failure, he/she can fail over
the pool to the backup pool by issuing commands in the management shell.
Even though administrator intervention is needed, the disruption that users experience can be mitigated,
which enables reasonable service continuity for users.