... work withLOOP-U3500 2wire 128Kbps Baseband Modem1) Work mode: 2-wire private line; full duplex2) Data transmission rates: ... 64K, 48K, 38.4K, 19.2K, 9.6K, 4.8K,2.4K, 1.2K, 0.6Kbps3) Asynchronous 38.4K, ... 19.2K, 9.6K, 4.8K, 2.4K, 1.2K, 0.6Kbps 4) Transmission mode: synchronous or asynchronous 5 ... : impedance 135 ohms, physical interface RJ45, with pin 4 and pin5 (the middle two lines) 6) Transmission ...