I have 3 modems here that are the Westell WireSpeed brand. One says it is a Westell WireSpeed DSL Router model B90-220030-04. Another one says it is a Westell WireSpeed DSL Router A90-210030-04, and the other just says it is a DSL modem model # A90-210030-04. If I need a router, would one of these be sufficient? They all are still working with no problems.