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Wireless Case Study
Jan Snyder
San Antonio Community Hospital
Upland, CA
Why Wireless?
• Highly mobile workforce
• Need instant and continuous
access to information
• Desire greater staff efficiencies
• Opportunity to improve service
Wireless Experience
• First-generation WLAN installed
1999
• Wi-Fi: intriguing but costly to
install and support
• Difficult to troubleshoot, limited
capabilities
• Very difficult to scale
Critical Requirements
• Physician/nurse communications
• Access to PACS (Picture Archiving
and Communications Systems)
– Storage and retrieval of radiographic images
– Improves drug delivery accuracy
• Efficient patient flow management
• Leverage existing infrastructure
Importance of Redundancy
• PACS network requires failureresistant infrastructure
• Layer 3 network
– Two core switches
• No failure in 43 months
Need for True Mobility
• Crossing Layer 3 subnet boundaries is
critical
• Layer 2-based WLAN system enables
greatest mobility
• Applications, such as voice,
uninterrupted while roaming
• Secure connections link wireless users
between PACS subnets
• Secure encryption guarantees privacy
Roaming Across Layer 3
Services Improved
• Emergency – bedside data entry
• Surgery – wireless x-ray display
• Admission – quicker assessment
• Case management – improves care,
streamlines patient flow
• Discharge – frees up bed space for new
patients
Voice over Wireless IP
• Permits nurses to communicate
with physicians
• Requires support for fast roaming
with no change of IP address
• Requires strong QoS in WLAN
• Enabled via new PBX that links wireless
to desktop phones
Total Cost of Ownership
(One-Year Period)
Capital
Ops
Site survey
TCO
Old Arch. New Arch.
$180,000 $149,000
$8,000
$2,000
Cabling
Deployment
$53,000
$37,000
$53,000
$2,000
Config APs
$15,000
$1,000
Support
$25,000
$2,000
subtotal
$128,000 $63,000
(one year)
$318,000 $212,000
Total Cost of Ownership
(Five-Year Period)
Cost
Old Arch
New Arch
Capital
$360,000
$298,000
Operations $488,000
$148,000
TCO
(5 years)
$446,000
$848,000
Productivity Gains
Old Net
New Net
Annual
Savings
Case mgmt 15 patients/ 20 patients/
$150,000
nurse/day nurse/day
Emergency
$20,000
Admissions
Discharge
$86,000
$67,000
IS
Total
$42,000
$365,000
Formula: 33% productivity increase X annual nurse salary
X 15 nurses = $150,000
Return on Investment
• Costs for one year = $212,000
• Savings for one year = $365,000
• ROI = less than one year
WLAN Meets Needs
• Physicians and nurses communicate
continually
• Constant access to PACS for
radiology images
• Efficient patient flow
– Admission, case management, discharge
• Leverages existing network
Lessons Learned
(Microsoft 2001 Deployment)
Microsoft Problems
SACH Solution
25 users per AP
Design for capacity
10-meter rule
Dual-radio APs
Manual site survey
Automated planning
1 service call per 40
APs per day
Automated tool for
troubleshooting
Two cables – datalink
and console
Two cables –
redundant Ethernet
Backup AP configs
Configs stored in
database
“Buglight” syndrome
Dual PoE, datalinks
Benefits for Users
• Users roam and communicate
• Ease of use
– No changes to their handheld device,
wearable phones
• Security – authentication and encryption
– Users transmit data securely
• Mobility
– Users always have correct network access
as they roam (Identity-Based Networking)
Benefits for IT
• Simplified planning and design
• Depiction of RF transmissions
• Automatic configuration of WLAN
– WLAN switches and APs
• No changes to clients or core network
• User location on the floor plan
• Rogue detection and location on plan
– APs, users, ad hoc users
• 70% to 90% reduction in OpEx