17Telco Services To use the PathBuilder WAN functionality, you must buy lines and servicesfrom a telecommunications company (Telco). Services include but are notlimited to dial-up lines, leased lines, and packet-switched services.Dial-up lines allow you to dial your destination when necessary and hangup when you no longer need the connection. A leased line is alwaysavailable between two locations. Dial-up lines use the Point-to-PointProtocol (PPP). Leased lines typically use either PPP, Frame Relay, or X.25.Packet-switched services, like Frame Relay, use a combination of leased ordial-up lines with Telco-owned switching. Typical protocols used overpacket-switched services are Frame Relay, X.25, and SMDS.Table 3 and Table 4 describe the dial-up, leased, and packet-switchedservices supported by the PathBuilder S5xx series switches.Table 3 Dial-Up and Leased Line ServicesTelco Line Protocol Serial Device Requirements Data Transfer RateDial-Up Lines:Plain Old TelephoneService (POTS)PPP Modem Up to 115 KbpsISDN PPP Terminal Adapter Up to 128 KbpsISDN/PRI PPP None (on S590/S598 only) 2.048 Mbps/1.544MbpsLeased Lines:E1 FrameRelay, PPPCSU/DSU (not needed on S590/S598 Ultra-WANconnectors)2.048 MbpsT1 FrameRelay, PPPCSU/DSU (not needed on S590/S598 Ultra-WANconnectors)1.544 MbpsFractional T1 FrameRelay, PPPCSU/DSU (not needed on S590/S598 Ultra-WANconnectors)Up to 31 channels at56/64 Kbps eachE3 FrameRelay, PPPCSU/DSU (not needed on S593/S595 BNCconnectors)34.368 MbpsT3 FrameRelay, PPPCSU/DSU (not needed on S593/S595 BNCconnectors)44.736 MbpsDigital Data Service (DDS) PPP CSU/DSU Up to 64 Kbps
