PF04 - Traffic share induced on a service point link

Description of the control

Document the percentage of traffic the PST can add to a service point’s inbound link, across all of that service point’s users, under its intended or normal use.

What this control corresponds to

This criterion asks you to quantify the share of a site’s (e.g. a clinic’s) total internet/network link capacity the application will consume, not just its absolute need (PF03) - an important distinction when several applications share the same link.

Why this control is important

A service point (clinic, CLSC) has a fixed-capacity network link shared across several systems (clinical record, IP telephony, other applications). If the PST consumes a disproportionate share without this being documented, it can silently degrade the site’s other critical services - a risk the local IT lead cannot anticipate without this figure.

How to implement it

• Calculate, for a typical service point (representative user count), the PST’s share of traffic relative to a common reference link in the health and social services network.
• Present this percentage for different site profiles (small service point vs. large centre).
• Document intensive-use scenarios (e.g. imaging transfer) that temporarily push this share higher.

How to verify it’s in place

• Request the calculation and the assumptions used (reference link size, user count).
• Verify consistency with the data measured in PF01/PF03.
• Confirm this information is shared with regional network teams before deployment.