SpectraLink h340 - Manual (Page 8)

SpectraLink Corporation Configuration and Administration—NetLink e340/h340/i640 Wireless Telephone
with SIP
PN: 72-1089-02-D.doc Page 8
2.5 System Components
NetLink e340/h340/i640 Wireless Telephone
The NetLink e340/h340/i640 Wireless Telephone is a lightweight, durable handset
specifically designed for mobile workplace use within a facility using SIP and an
802.11 wireless LAN. The handsets are to be used on-premises; they are not cellular
or satellite phones.
NetLink e340/h340/i640 Wireless Telephones use direct-sequence spread spectrum
radio technology (DSSS) to transmit audio packets over wireless LAN APs that
support SpectraLink Voice Priority (SVP).
NetLink SVP Server
SVP is the SpectraLink quality of service (QoS) mechanism that is implemented in
the AP to enhance voice quality over the wireless network. SVP gives preference to
voice packets over data packets on the wireless medium, increasing the probability
that all voice packets are transmitted efficiently and with minimum or no delay. SVP
is fully compatible with the IEEE 802.11b standard.
The NetLink SVP Server is an Ethernet LAN appliance that works with the AP to
provide QoS on the wireless LAN. All SIP packets to and from the NetLink
e340/h340/i640 Wireless Telephones pass through the NetLink SVP Server and are
encapsulated for prioritization as they are routed to and from other SIP devices.
Access points
Supplied by third-party vendors, APs provide the connection between the wired
Ethernet LAN and the wireless (802.11) LAN. Access points must be positioned in
all areas where handsets will be used. The number and placement of APs will affect
the coverage area and capacity of the wireless system. Typically, the requirements for
use of NetLink e340/h340/i640 Wireless Telephones are similar to that of wireless
data devices.
Access points must utilize SpectraLink Voice Priority (SVP). See the NetLink
Wireless Telephone WLAN Compatibility List for information about APs that
support SVP.
Ethernet switch
Interconnects multiple network devices, including the NetLink SVP Server, the
proxy server(s), wired IP phones and the APs. Ethernet switches provide the highest
performance networks, which can handle combined voice and data traffic, and are
required when using the NetLink e340/h340/i640 Wireless Telephones.
Although a single Ethernet switch network is recommended, the handsets and the
NetLink SVP Server can operate in larger, more complex networks, including
networks with multiple Ethernet switches, routers, VLANs and/or multiple subnets.
However, in such networks, it is possible for the quality of service (QoS) features of
the NetLink SVP Server to be compromised and voice quality may suffer. Any
network that consists of more than a single Ethernet switch should be thoroughly
tested to ensure any quality issues are detected.