Planning and Installation Guide Chapter 9: Network Requirements and Preparation
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9.5.3 Frame Relay
Frame Relay is a viable option as long as you get a committed information rate (CIR) that
meets the bandwidth and network requirements for toll-quality voice communications.
9.5.4 SDSL
SDSL is considered “business-to-business” DSL in which you can negotiate a service level
agreement with the service provider. Unlike T1, SDSL is priced on a flat bandwidth basis,
making the price “distance insensitive” and cost-effective over long distances.
Although this is an excellent option, especially moving forward, ShoreTel has found the use
of SDSL challenging, since the service providers often commit to a Service Level Agreement
(SLA) they cannot fulfill. Many service providers have grown very fast, and the IP network
is a patchwork of devices. These service providers are usually geared toward providing
bandwidth for typical data applications, and a voice application highlights weaknesses in
their network. Only with joint troubleshooting of the service provider’s network, using
tools such as ping plotters, has ShoreTel been able to achieve the SLA the service provider
promised.
9.5.5 IDSL
IDSL modems, which have an uplink and downlink speed of 144 Kbps, can be considered
for teleworking applications. The actual performance will vary based on your service
provider and your applications.
9.5.6 ADSL
ADSL modems, which have an uplink speed of 128 Kbps, can be considered for
teleworking applications. The actual performance will vary based on your service provider
and your applications.
9.5.7 Cable Modems
Cable modems, which can have an uplink speed of 128 Kbps, can be considered for
teleworking applications. The actual performance will vary based on your service provider
and your applications.
9.5.8 ISDN BRI
ISDN BRI is not supported at this time.
9.5.9 Dial-Up Modems
Because of their inherent latency and low bandwidth, dial-up modems are not supported.
9.6 IP Address Assignment
Each ShoreGear voice switch requires one IP address. Each software server must be
configured with a static IP address. You can use one of the following to serve an IP address
to a voice switch:
DHCP on a network server
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