Specifications

9 Reference Architecture | Dell
TM
Unified Communication Solution with Microsoft® Lync® Server 2013 for Single Site
Implementation | Version 1.0
encryption/decryption and transcoding. Traffic encryption and decryption is made possible by the use
of TLS (Transport Layer Security) instead of traditional TCP. This is more secure than transmitting clear
traffic over the wire. Transcoding refers to the process of converting media streams between different
audio codecs. Transcoding becomes necessary if the telephony codec used is not G.711, i.e. the codec
used by Lync.
• Director Server—This is an optional role in Lync Server 2013. The Director role provides resiliency and
redirection to user requests to their home pool, which can be either a Standard Edition server or an
Enterprise Edition Front End pool. A Director protects Front End servers from denial-of-service attacks
and cannot be collocated with any other server role.
• Persistent Chat Server— This is a new and separate role in Lync Server 2013 that provides features
similar to group chat in earlier versions of Lync. Persistent chat allows users to participate in multiparty
and topic-based chat. Chats can be categorized by topic in a chat room and are not transient like un-
archived instant message conversations or audio/video/web conferences.
• Edge Server—This role in Lync 2013 is responsible for handling all communications that are made
available to external and federated users except anything related to HTTP/HTTPS. All other traffic, such
as SIP or RTP, is routed to the external users using the Edge Server.
• Standard Edition Server—The Standard Edition server delivers the features of Lync Server 2013 using
integrated databases on a single server. This configuration enables an organization to have Lync Server
2013 infrastructure at a low cost and in a form that can be deployed with a backup registrar
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to
provide limited high availability features. This handles all Lync workloads, including client
authentication, instant messaging, user presence updates, web conferencing, audio/video
conferencing and Enterprise Voice, all running on one server.
This reference architecture represents a single site Lync Server 2013 deployment with up to 1,000 users.
Microsoft Lync Server 2013 Standard Edition is suited for small implementations that reduce customer
total cost of ownership (TCO) and increase return on investment (ROI).
Listed below are the other roles that can be a part of a Lync Server 2013 deployment:
• Office Web Apps Server—Lync Server 2013 uses Office Web Apps Server to provide enhanced web
conferencing with PowerPoint® presentations. This role enables the use of presentations with custom
fonts, animated slides and higher-resolution content sharing.
• Reverse Proxy Servers—This role is an external component that complements the Edge Server role by
handling web services traffic. With the Reverse Proxy, external users can access web services available
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http://blogs.technet.com/b/nexthop/archive/2013/09/04/understanding-hadr-in-lync-server-2013.aspx