The CRTC approved revised rates Thursday for wholesale support structure services provided by Bell Aliant, Bell Canada, MTS Allstream, Telus Corp. and Télébec. Through support structure services, which are tariffed wholesale services, local incumbent telcos make poles, stands and conduits available to third parties so they can provide competitive retail services. Each support structures incurs different rates. In its decision Thursday, the commission also opened a follow-up proceeding on service pole rates and a possible increase in support structure costs. The new rates are available in the decision.