Welch Allyn Connex Vitalslink By Cerner, And Connex Csk Best Practices Overview - Installation Guide - Manual (Page 7)

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Best practices
Required network settings and configurations
These configurations and settings are required to establish a durable connection between
Welch Allyn devices and the wireless network. Failure to comply with these requirements
will result in a failure to connect to the network, repeated disconnects or extended loss of
telemetry data. Requirements in this section can be modified by requirements listed in
the appropriate vendor-critical requirements documents.
Best practice Affected types Without best practice
Authentication/encryption
All versions:
•
WEP 64 and 128
• WPA2 Personal
Radio software versions 3.00.01 and later also support:
•
WPA2 Enterprise (EAP-TLS, EAP-TTLS, EAP-PEAP [MSCHAPv2])
Note Welch Allyn radios use CCMP encryption. If TKIP is also
enabled on the SSID, the 'CCMP and TKIP' security option must be
selected on the device’s configuration screen.
Wireless Other encryption methods not supported. No
connectivity.
Channel Switch Announcement (CSA) Disable Wireless When CSA is enabled, data loss when changing
channels may occur.
DFS If DFS channels are used – a practice discouraged for patient
monitors – the SSID must be broadcast. Wireless Welch Allyn devices will not initiate a connection on
DFS channels unless the appropriate SSID is detected
via WLAN Beacon.
Interference Signal to Noise Ratio (SNR)
15dB
Wireless High noise level causes dropped packets.
IP address assignment Must be performed through renewable
DHCP lease (DHCP fixed to MAC is acceptable) Wireless and
wired The device cannot connect to the network without an
IP address.
Regulatory Domain Advertisement 802.11d announcement
enabled Wireless Failure to include a country code in 802.11 Beacon
frames degrades connectivity and roaming
performance.
Signal strength Primary wireless signal: RSSI Value
 -65dBm
(when 802.11a APs set to 25mW). A secondary wireless signal of
-70dBm or better is highly recommended for redundancy. For proper
Tx/Rx balance, RSSI readings must apply when APs at transmitting
at 25mW or less.
Wireless The device radio transmits at 25mW power (nominal).
AP signal strength and radio signal strength must be
balanced. If not, dropped packets and loss of
connectivity can result.
Data rates Enable 802.11 a/g data rates of 6Mbs and higher. In
areas where RSSI minimums (both primary and secondary) cannot
be guaranteed, enabling all all 802.11 data rates may be necessary
to increase transmission range. Wireless Disabling low data rates can introduce coverage
issues leading to increased disconnects and dropped
data, particularly in areas with higher interference or
congestion.
Ethernet connections to CVSM/CIWS must be configured to
robustly support device with max data-rate of 100Mbs Wired Mismatched configuration or autonegotion failures
may cause disconnects.
SSID name Maximum length of 16 characters
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Wireless The radio cannot be configured.