I have a data sheet for a part which requires the TD+ and TD- signals to be routed as matched length and with "a characteristic single-ended impedance of 50 ohms". I understand the matched length part, and I know how to attain an impedance of 50 ohms on the entire PCB, but what do I need to do to insure 50 ohms impedance on just 4 traces? I'm using 6 mil traces with 6 mil spacing. Thanks in advance for any advice on this. ********************************************************** Alexis Meehan WaveSpan Corporation Engineering Services 500 N. Bernardo Avenue Tel: 650-237-8365 Mountain View, CA 94043 Fax: 650-919-0191 http://www.wavespan.com *********************************************************** ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################