CES-WE case studies
CES-WE · Put your knowledge to work in context.
CES-WE is a professional certification exam code used by a credentialing body to designate candidates who have demonstrated competence in a specialised practice area. Candidates who sit for it are typically working practitioners - engineers, auditors, consultants, inspectors or programme managers - who need an externally recognised signal of competence for employers, clients or regulatory contexts, rather than a general introductory certificate. The CES-WE case studies are 5 cases and about 3,567 words.
1Distribution Center: Wide Channels, High Retries
A 18,000 m² automated distribution center runs 24 ceiling-mounted 5 GHz access points on 40 MHz channels. Coverage surveys passed, but since go-live the 220 handheld scanners show a 34% average retry rate and 68% channel utilization at peak (10:00–14:00), with 30–45 disconnects per minute clustered at aisle intersections.
781 words, about 4 min2Sixty Switches, One Four-Hour Window
You must push a firmware update to 60 branch switches. A 25-device pilot produced 3 failures: each dropped 802.1X and needed a physical console cable to recover, about 35 minutes apiece, one device at a time.
659 words, about 3 min3"Slow Wi-Fi" After a Fiber Upgrade
An office reports "slow Wi-Fi" after a 1 Gbps fibre upgrade. The user's laptop shows a 144 Mbps negotiated rate, and the vendor brochure promises "up to 1.2 Gbps." An internet speed test returns 90 Mbps down.
699 words, about 3 min4The 1,024-Client Auditorium
Sales is about to commit to a 1,000-seat auditorium using 12 access points, citing a datasheet figure of "up to 1,024 associated clients per AP." The peak scenario: 1,000 attendees, mixed devices, average 1.5 Mbps per active client during a live-streamed keynote, with 70% of attendees active simultaneously. Each AP is planned on one 5 GHz 40 MHz channel at MCS7 with 2 spatial streams, roughly 300 Mbps PHY and about 180 Mbps TCP goodput; design policy caps real-time traffic at 60% airtime utilization.
753 words, about 4 min5The 99.9% Availability Claim and a Contractor's Backhoe
A managed WAN contract guarantees 99.9% monthly availability per site, measured as 1 minus (unplanned downtime ÷ total minutes), excluding scheduled maintenance and customer-caused outages. Credits are 5% of monthly recurring charge per full 60 minutes of downtime beyond the threshold, capped at 30%.
675 words, about 3 min