SpectraLink NetLink Wireless Telephones Best Practices White Paper Wireless Telephone - Manual (Page 13)

White Paper
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data transmission rate of 2 Mb/s.
A NetLink SVP Server is required for applications using an IP telephony
server or using more than four NetLink Telephony Gateways. A NetLink
SVP Server can also be used with four or fewer NetLink Telephony
Gateways to allow a maximum data transmission rate of 11 Mb/s.
A single NetLink SVP Server supports 120 simultaneous calls when
used with NetLink Telephony Gateways, or 80 simultaneous calls with
an IP telephony server. Multiple NetLink SVP Servers can be used to
increase capacity to support up to 850 total calls and 8,000 Wireless
Telephones for IP telephony server interfaces. When used with NetLink
Telephony Gateways, the total number of users is limited to 640 total
users (40 NetLink Telephony Gateways). Refer to the NetLink SVP
Server Installation, Setup, and Maintenance for more information about
the maximum number of simultaneous calls and Wireless Telephones
supported by multiple NetLink SVP Servers.
For installations with multiple NetLink SVP Servers, call resources are
automatically allocated between the APs and the NetLink Wireless
Telephones by those devices’ MAC addresses. Allocation is done by
dividing the MAC address by the number of NetLink SVP Servers and
assigning the device based on the remainder. For example, if three
NetLink SVP Servers are used, the first NetLink SVP Server is assigned
to all APs and NetLink handsets with MAC addresses that are even
multiples of three. The second NetLink SVP Server is assigned to MAC
addresses with a remainder of one when divided by three, and the third
is assigned to the MAC addresses with a remainder of two. In most
instances, because of the large number of Wireless Telephones and
APs expected in such an application, the distribution of call processing
will be relatively even across all NetLink SVP Servers.
If a NetLink SVP Server other than the SVP Server assigned as the
‘master’ fails and can be no longer detected, the call processing will be
automatically redistributed among the remaining servers. Some active
calls may be lost during this process, but the process does not require
any manual re-configuration. To minimize downtime related to a failed
master NetLink SVP Server or a single server, a spare NetLink SVP
Server can reside on the network and in the case of a failure, the
network administrator can assign the IP address of the failed unit to the
replacement SVP Server