011 52 16 12 47 47 The Transborder Shelter Network (TSN)is a network of organizations dedicated to affordable housing on both sides of the US/Mexican border. The purpose of the TSN is to assist its members to increase access to affordable housing by low-income populations. The TSN accomplishes this objective through three principal activities: 1) Information exchange; 2) Leveraging of resources; 3) Policy analysis and advocacy.