Welch Allyn Connex , VitalsLink by Cerner, and Connex CSK Network installation

Welch Allyn Connex , VitalsLink by Cerner, and Connex CSK Network installation
Welch Allyn Connex®, VitalsLink
by Cerner, and Connex CSK
Network installation
Best practices overview
Welch Allyn Network installation
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the product is permitted to copy this publication, for internal distribution only, from the media provided by Welch Allyn. No other use,
reproduction, or distribution of this publication, or any part of it, is permitted without written permission from Welch Allyn
Welch Allyn assumes no responsibility for any injury to anyone, or for any illegal or improper use of the product, that may result from
failure to use this product in accordance with the instructions, cautions, warnings, or statement of intended use published in this
For patent information, please visit www.welchallyn.com/patents.
For information about any Welch Allyn product, or to contact your nearest Welch Allyn representative, go to
Manual DIR 80018745 Ver C
Welch Allyn, Inc.
4341 State Street Road
Skaneateles Falls, NY 13153 USA
Welch Allyn Limited
Navan Business Park
Dublin Road, Navan
County Meath, Republic of Ireland
1 - Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Systems overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 - Best practices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Required network settings and configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Recommended network settings and configurations. . . . . . . . . . . . . . . . . . . . . . 4
General network settings and configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Welch Allyn Network installation
About this document
This document lists required, recommended, and basic settings and configurations for
networks using Welch Allyn medical devices and systems. For vendor-specific required,
recommended, and basic settings and configurations, go to the following web site:
Systems overview
Welch Allyn connected workstations, servers and patient monitors utilize standards based
communications protocols including, but not limited to, 802.3 for wired Ethernet and
802.11a/b/g for wireless. This guide specifies the requirements and recommendations
needed to successfully complete and maintain a Welch Allyn patient monitoring system in
your wireless or wired network.
Implementation and maintenance of a stable and usable integrated network is the sole
responsibility of the customer.
Although ultimately your responsibility, Welch Allyn recommends that you conduct a
hazards analysis per IEC 80001 to determine if any issues exist that should be mitigated
to ensure your patients safety.
Welch Allyn Network installation
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
All versions:
• WEP 64 and 128
• WPA2 Personal
Radio software versions 3.00.01 and later also support:
CSM radio also supports:
passwords are not supported), PEAP-TLS
Note Welch Allyn CVSM 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.
Other encryption methods not supported. No
Channel Switch Announcement (CSA) Disable
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 when using CVSM radio
SW V3.00.02 or earlier.
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
High noise level causes dropped packets.
IP address assignment Must be performed through renewable
DHCP lease (DHCP fixed to MAC is acceptable)
Wireless and
The device cannot connect to the network without an
IP address.
Regulatory Domain Advertisement 802.11d announcement
Failure to include a country code in 802.11 Beacon
frames degrades connectivity and roaming
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.
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.
The maximum data rate supported for CSM is 54Mbs for 802.11 a/g
and 72Mbs for 802.11n.
Disabling low data rates can introduce coverage
issues leading to increased disconnects and dropped
data, particularly in areas with higher interference or
Best practices
Best practice
Welch Allyn Network installation
Affected types Without best practice
Ethernet connections to CVSM/CIWS/CSM must be configured to Wired
robustly support device with max data-rate of 100Mbs.
Mismatched configuration or autonegotion failures
may cause disconnects.
SSID name Maximum length of 32 characters1
The radio cannot be configured.
Required ports open
• TCP: 281, 283
• UDP for Spot LXi:
• UDP for CVSM:
291, 7711-7719
Wireless and
Connections cannot be established.
Wireless and
For Spot LXi:
• Allow UDP broadcasts (port forwarding) on ports 44435-44436.
Connections cannot be established from the Welch
Allyn VLAN to the server.
For CVSM and CSM, perform at least one of the following:
• Configure the device with a fixed IP address of the Connex
• Configure the DNS server to resolve a locally defined DNS
identity to up to three Connex server IP addresses. CVSM
devices must be configured with DNS identity2
• Configure the DHCP server to support option 60 lookup of fixed
Vendor Class Identifier “welchallyn-nrs.” The corresponding
option 43 value is an encapsulated list of up to three Connex
Server IP addresses.3
• Allow UDP broadcasts (port forwarding) on ports 7711-7719
(CVSM only)
SSID/Radio settings
• a band (required for continuous monitoring, recommended for
episodic data)
• b/g band (supported but not recommended for episodic data)
• a/b/g are acceptable for ConnexVM, Cerner and CSK
CVSM/Spot LXi radios can be configured for one of the following
two options:
• 802.11a
• 802.11/b/g
CSM radio can be configured for one of the following four options.
Band steering is supported for the first two options.
• 802.11a/b/g
• 802.11a/b/g/n (SISO)
• 802.11b/g
• 802.11b/g/n (SISO)
Loss of connection and data, patient monitor will not
For CVSM software versions 1.7X and earlier and Spot LXi, there is a 16 character maximum.
Requires CVSM software version 2.00.05 and later.
Requires CVSM software version 2.10.00 and later with radio firmware versions 3.00.02 and later.
Recommended network settings and configurations
The best practices and configuration settings listed in the following table are
recommended for best performance. Increased data packet loss or occasional
disconnects are likely if these recommendations are not followed. Recommendations in
this section can be modified by requirements listed in the appropriate vendor-critical
requirements documents.
Best practices
Best practices
Best practice
Affected types Without best practice
802.1X Authentication When using EAP (certificates) for
authentication, enable OKC (opportunistic key caching) on the
Increased chance of disconnect during roaming.
QoS Welch Allyn data should have priority over other data. Welch Wireless and
Allyn data is configured for 802.11e Access Category Voice.
Hardware Quality of Service (QoS) support should be configured to
map 802.11e QoS bits to a hard-wired tag
Increased probability of dropped patient data packets
on busy wireless networks.
Roaming across subnets Keep the Welch Allyn wireless VLAN
flat (no roaming across subnets or wireless controllers)
Success for roaming across subnets depends on the
hospital’s Layer-3 network. Hospital is responsible for
validation of proper roaming across subnets.
Rules/Firewall Use separate rules and roles for Welch Allyn
patient data and other IT data. Rules and roles should be identified
using Welch Allyn specific names.
IT changes to the wireless controller that inadvertently
affect patient monitoring are more likely. Patient data
subject to issues on wired network such as broadcast
storms. Shorter battery life for patient monitors.
Separate VLAN Keep Welch Allyn patient monitors on their own
Wireless and
IT changes to the wireless controller that inadvertently
affect patient monitoring are more likely. Patient data
subject to issues on wired network such as broadcast
storms. Shorter battery life for patient monitors.
Wireless Multimedia (WMM) Enabled
Monitors will disconnect during movement.
General network settings and configurations
The following best practices should be followed to maintain a robust system suited for
medical patient monitoring.
Best practice
Affected types Without best practice
VoIP traffic If the controller feature set allows, limit VoIP traffic on Wireless
802.11a to no more than three open connections per AP. Also, allocate
a minimum of 7% AP bandwidth to Welch Allyn monitor traffic.
Welch Allyn wireless traffic is tagged as VoIP QoS
so it has priority in busy environments. For this to
be effective, the amount of competing VoIP traffic
must be constrained. Failure to allocate AP
resources to Welch Allyn monitor traffic could
increase patient data loss.
Controller redundancy Wireless controller hardware should include Wireless
controller redundancy, either one to one or one to many (1:1 or N:1)
Failure of a non-redundant controller would cause
the entire system to fail.
Critical IT support The customer shall provide 24/7, mission-critical Wireless and
support for their network
Possible extended downtime if network support
cannot be reached.
DHCP Information
• Primary DHCP Server = Primary server IP address
• Secondary DHCP Server = Secondary server IP address
Loss of connection and data.
Jitter Packet-to-Packet jitter shall be  400ms
Wireless and
Dropped packets, data loss and dropped
Labeling Welch Allyn VLAN ports should be clearly marked on the
physical switches
Wireless and
Harder to debug system issues. Mixing of IT and
patient data could result in loss of data due to
broadcast storms.
Network latency Round-trip peak network latency between a server Wireless and
and its patient monitor 800ms
Dropped packets and data loss.
Packet transport Packets should be passed through switches and
routers in cut-through mode, or hardware based switching, not storeand-forward-only mode (applicable to older switches/hubs)
Dropped packets and data loss.
Best practices
Welch Allyn Network installation
Best practice
Affected types Without best practice
Power redundancy All network equipment used for patient
monitoring should have a continuous power supply and emergency
Wireless and
Data loss and downtime due to power outages.
Wired connections Connections between switches, wireless
controllers, servers and similar equipment should use gigabit Ethernet.
In cases where connections to lower speed ports are unavoidable, do
not rely on auto-negotiation. Explicitly configure speed and duplex
settings to 100Mbps and Full Duplex.
Unreliable network connection, and severely
affected appliances connected through the
interface. Lower speed connection interleaved
between high speed connections could introduce
Spanning Tree Protocol (STP) STP should be turned off for the
Wireless and
Welch-Allyn specific wireless VLAN/SSID. Enable “port fast” for non- wired
trunked wired interfaces connected to continuous monitors, wireless
controllers, or Welch Allyn Servers.
Dropped connections.
SSID/Radio settings
• Radio Beacon Interval set to =100 msec
• DTIM set to 10
• Enable short preamble
• Disable channel 165
Loss of connection and data, patient monitor will
not connect.
WLAN Optimization
• Controller CPU utilization < 40%
• Radio channel utilization < 40%
• Number of SSIDs per AP  4
• Number of clients per AP 25
• Controller memory utilization  20Mb
• Average RSSI of all clients -67 dBm
• AP Received packet error rate  10%
When network performance is outside
recommended parameters, there is the potential for
loss or corruption of data.
Separation Separation distance between wireless devices should be Wireless
 2 meters
Possible data loss due to increased interference.
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