Microwave Radio Communications T1 / MMDS / CATV Microwave Communication Networks DSO=64 kbps, DS1=1.544 mbps, (T1) 24 DSO's, DS3=45 mbps (28 T1's), ESF=Extended Super Frame ISDN=Integrated Systems Digital Network, T1 Copper Connection=2 pair Pins 1-2 and 7-8 DSUs/CSUs 568A 568B, Category 5 RJ45, OC=Optical Carrier(level), NNI=Network to Network Interface, OC-12=622