ixc Communications Inc., Austin, TX, and gst Telecommunications Inc., Vancouver, WA, have agreed on a fiber-optic cable exchange allowing both companies to extend their networks in the western United States. Under the terms of the exchange, ixc will acquire dark fiber from gst on a route from Los Angeles to San Francisco, CA. gst will acquire fiber on a segment of ixc?s network from Los Angeles to Las Vegas, NV, to Phoenix, AZ.