Data Transmission Networks

An Internet connection is part of a larger system of interconnected networks. Providers must exchange traffic so that a customer on one network can reach a service hosted on another. An Internet exchange point, or IXP, supplies shared infrastructure for this exchange. RIPE NCC explains that local interconnection can reduce the need for domestic traffic to travel abroad and return, a practice often called tromboning. These principles help explain transmission architecture, although its regional report is not an inventory of Iranian links. s1

This makes transmission different from hosting. A data center supplies the environment for computing equipment; interconnection supplies paths between networks. Both matter to a service’s accessibility, but evidence about one cannot substitute for evidence about the other. s1

Packet Clearing House’s registry identifies Tehran IX as an Ethernet exchange managed by the Telecommunication Infrastructure Company, usually abbreviated TIC, and records its establishment on 15 May 2016. This provides a specific institutional example of domestic traffic exchange. The record does not supply a complete physical topology or a map of every participating network’s connections. s2

The Internet Society’s August 2026 snapshot offers another perspective on the exchange. Its capacity measure adds the port speeds reported for participants. That is a measure of provisioned connection capacity in the underlying registry, rather than observed traffic, countrywide bandwidth, or the speed available to an individual subscriber. The underlying PeeringDB records are self-reported, so their coverage should not be mistaken for a complete census of Iran’s interconnection system. s3

Local exchange and wider connectivity

This simplified model separates local interconnection from onward connectivity. It illustrates network functions, not Iran’s physical cable layout, universal routing paths, or an institutional chain of command.

Routing information and successful communication describe different things. In its May 2026 analysis of Iranian shutdowns, Cloudflare reported that IPv4 address announcements remained comparatively stable even when actual traffic had largely disappeared. The company interpreted this as evidence that restrictions could operate through mechanisms other than removing those routes from global routing tables. Its measurements did not identify every device or rule responsible. s4

Earlier collaborative research provides complementary evidence. The autumn 2022 report coordinated by OONI and the Internet Society documented disruptions that varied by mobile network, region, application, and protocol. It shows why national averages or a single speed test cannot fully describe a transmission network’s practical availability. A path may work for one service while another is blocked, and one region’s experience may differ from another’s. s5

For readers evaluating infrastructure claims, the essential question is what was measured: a registered exchange connection, an announced route, or successfully delivered traffic. Each provides useful evidence, but each answers a different question. The inspected material supports a functional explanation of Iranian interconnection and documented disruptions; it does not establish a complete backbone map or an annual national capacity series. s2s3s4s5