1 Welch Allyn Connex, VitalsLink by Cerner, and Connex CSK Network installation Best practices overview
2 ii Welch Allyn Network installation 2015 Welch Allyn. All rights are reserved. To support the intended use of the product described in this publication, the purchaser of 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 manual. For patent information, please visit For information about any Welch Allyn product, or to contact your nearest Welch Allyn representative, go to Manual DIR Ver C Welch Allyn, Inc State Street Road Skaneateles Falls, NY USA Welch Allyn Limited Navan Business Park Dublin Road, Navan County Meath, Republic of Ireland
3 iii Contents 1 - Introduction...1 About this document...1 Systems overview Best practices....3 Required network settings and configurations...3 Recommended network settings and configurations....4 General network settings and configurations...5
4 iv Contents Welch Allyn Network installation
5 1 Introduction 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, for Ethernet and a/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 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 to determine if any issues exist that should be mitigated to ensure your patients safety.
6 2 Introduction Welch Allyn Network installation
7 2 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 and later also support: WPA2 Enterprise (EAP-TLS, EAP-TTLS, EAP-PEAP [MSCHAPv2]) CSM radio also supports: WPA/WPA2 (TKIP), EAP-FFAST, PEAP-GTC (one-time 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 connectivity. 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 V 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) Regulatory Domain Advertisement d announcement enabled Signal strength Primary wireless signal: RSSI Value -65dBm (when a 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. Data rates Enable a/g data rates of 6Mbs and higher. In areas where RSSI minimums (both primary and secondary) cannot be guaranteed, enabling all all data rates may be necessary to increase transmission range. The maximum data rate supported for CSM is 54Mbs for a/g and 72Mbs for n. and The device cannot connect to the network without an IP address. Failure to include a country code in Beacon frames degrades connectivity and roaming performance. 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. Disabling low data rates can introduce coverage issues leading to increased disconnects and dropped data, particularly in areas with higher interference or congestion.
8 4 Best practices Welch Allyn Network installation Best practice Affected types Without best practice Ethernet connections to CVSM/CIWS/CSM 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 32 characters 1 The radio cannot be configured. Required ports open TCP: 281, 283 UDP for Spot LXi: UDP for CVSM: 291, Rendezvous For Spot LXi: Allow UDP broadcasts (port forwarding) on ports For CVSM and CSM, perform at least one of the following: Configure the device with a fixed IP address of the Connex server 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 identity 2 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 (CVSM only) and and Connections cannot be established. Connections cannot be established from the Welch Allyn VLAN to the server. 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: a /b/g CSM radio can be configured for one of the following four options. Band steering is supported for the first two options a/b/g a/b/g/n (SISO) b/g b/g/n (SISO) Loss of connection and data, patient monitor will not connect. 1. For CVSM software versions 1.7X and earlier and Spot LXi, there is a 16 character maximum. 2. Requires CVSM software version and later. 3. Requires CVSM software version and later with radio firmware versions 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.
9 Best practices Best practices 5 Best practice Affected types Without best practice 802.1X Authentication When using EAP (certificates) for authentication, enable OKC (opportunistic key caching) on the controller QoS Welch Allyn data should have priority over other data. Welch Allyn data is configured for e Access Category Voice. Hardware Quality of Service (QoS) support should be configured to map e QoS bits to a hard- tag and Increased chance of disconnect during roaming. 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) 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. Separate VLAN Keep Welch Allyn patient monitors on their own VLAN and SSID and Success for roaming across subnets depends on the hospital s Layer-3 network. Hospital is responsible for validation of proper roaming across subnets. IT changes to the wireless controller that inadvertently affect patient monitoring are more likely. Patient data subject to issues on network such as broadcast storms. Shorter battery life for patient monitors. IT changes to the wireless controller that inadvertently affect patient monitoring are more likely. Patient data subject to issues on network such as broadcast storms. Shorter battery life for patient monitors. 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 a to no more than three open connections per AP. Also, allocate a minimum of 7% AP bandwidth to Welch Allyn monitor traffic. Controller redundancy controller hardware should include controller redundancy, either one to one or one to many (1:1 or N:1) Critical IT support The customer shall provide 24/7, mission-critical support for their network DHCP Information Primary DHCP Server = Primary server IP address Secondary DHCP Server = Secondary server IP address Jitter Packet-to-Packet jitter shall be 400ms Labeling Welch Allyn VLAN ports should be clearly marked on the physical switches Network latency Round-trip peak network latency between a server and its patient monitor 800ms 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) and and and and Wired 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. Failure of a non-redundant controller would cause the entire system to fail. Possible extended downtime if network support cannot be reached. Loss of connection and data. Dropped packets, data loss and dropped connections. Harder to debug system issues. Mixing of IT and patient data could result in loss of data due to broadcast storms. Dropped packets and data loss. Dropped packets and data loss.
10 6 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 power 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. Spanning Tree Protocol (STP) STP should be turned off for the Welch-Allyn specific wireless VLAN/SSID. Enable port fast for nontrunked interfaces connected to continuous monitors, wireless controllers, or Welch Allyn Servers. SSID/Radio settings Radio Beacon Interval set to =100 msec DTIM set to 10 Enable short preamble Disable channel 165 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% Separation Separation distance between wireless devices should be 2 meters Wired and Unreliable network connection, and severely affected appliances connected through the interface. Lower speed connection interleaved between high speed connections could introduce bottleneck. Dropped connections. Loss of connection and data, patient monitor will not connect. When network performance is outside recommended parameters, there is the potential for loss or corruption of data. Possible data loss due to increased interference.
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