S8300 And G700 Reliability - Avaya G700 Overview Manual

Main Components
Avaya P330 Stacking Fabric (Octaplane)
The Octaplane is a name for an Avaya hardware capability to bundle stackable components using a 4
bgps in each direction technology. This technology combines separate units into a larger logical
switch using different lengths of cables that are connected to the expansion slots in the rear of the
units. The cables are wired in a ring configuration, providing redundancy to the stack. In the event
that a single unit should fail, the stack integrity is maintained. You can remove, or replace, any single
unit without disrupting operation or performing stack-level reconfiguration.
Power Supply
The G700 Media Gateway uses an AC power supply. A power supply located in the G700 Media
Gateway converts AC input power to voltages needed by the solution.
Maintenance Software
The Media Server with the G700 Media Gateway has a dual maintenance strategy. Maintenance
software runs on both the G700 Media Gateway platform and the Media Server for the subsystems on
the platform. This platform software performs initialization and motherboard maintenance, along
with internal environmental monitoring.
In contrast, Media Modules are tested and brought into service by the Media Server maintenance
software after the G700 Media Gateway registers with the Media Server. While the G700 Media
Gateway maintenance software is aware of the Media Modules, the modules and associated ports are
controlled by the Media Server. Error logs are maintained on the Media Server.

S8300 and G700 Reliability

A G700 Media Gateway can include a Local Survivable Processor (LSP), which allows a G700 Media
Gateway to be a survivable call-processing server for remote and branch locations. The LSP is actually an
S8300 Media Server that sits in idle standby mode, not processing any calls. Each LSP has a copy of the
translations of the primary controller, either an S8700 Media Server or an S8300 Media Server. Translations
are updated regularly and automatically on the LSP from the primary controller via a virtual link through a
dedicated IP network. When the media gateway's processor (MGP) or IP endpoints perceive the primary
controller to be unreachable, they attempt to register with the LSP so call processing can continue.
Calls That Are Preserved
The LSP will activate if, for any reason, the communication between the G700 Media Gateway and the
primary media server stops. The fail-over from the primary media server to the LSP is an automatic process
and does not require human intervention. IP-to-IP shuffled calls are preserved, though IP phone users
cannot use phone features with currently-active calls. All other calls are dropped. After the LSP assumes
control of call-processing, IP-to IP shuffled calls still operate normally. Users with DCP and analog phones
can call other users on phones connected to their media gateway, but must make calls over the public
network to reach users on the primary controller.
When the primary controller or its connection to the media gateway is restored, a manual reset on the LSP
breaks the communication between the LSP and all registered endpoints. This reset causes the endpoints to
register with the primary media server. During fail-back to the primary media server, all calls are dropped
again with the exception of IP-to-IP calls.
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Overview of G700 Media Gateway and S8300 Media Server
555-234-200 — Issue 3 — May 2003