 Telecoms carriers can obtain traffic to make up a shortfall, or send traffic on other routes, by trading with other carriers in the wholesale or carrier-to-carrier market.A carrier needs a point of presence where they can interconnect with other carriers, usually in a carrier hotel such as 60 Hudson Street in New York or Telehouse in London by using a fiber ring to link their switches.This is an easy way of doing business, but it does mean that the other carriers in the market have partial visibility of what each other is doing.