SWITCH VENDOR TYPE DESCRIPTION -------- ------- ------- ----------------------------- 1AES AT&T Analog No. 1A ESS 1ES AT&T Analog No. 1 ESS 2BES AT&T Analog No. 2B ESS 2ES AT&T Analog No. 2 ESS 3ES AT&T Analog No. 3 ESS 3XB AT&T E/M No. 3 Cross-Bar 4ES AT&T Digital No. 4 ESS 5AXB AT&T E/M No. 5A Cross-Bar 5ES AT&T Digital No. 5 ESS 5ORM AT&T Digital Optical Remote Module 5RSM AT&T Digital Remote Switching Module 5XB AT&T E/M No. 5 Cross-Bar AXE10 Ericsson Digital Stand Alone or Host AXRSS Ericsson Digital Remote DGTL Digital Generic Digital Switch DMS1/200 NTI Digital DMS 100/200 DMS10 NTI Digital DMS 10 DMS100 NTI Digital DMS 100 DMS200 NTI Digital DMS 200 DPN NTI Packet Packet Switch EDX Siemens Packet Packet Switch NC23 NEC E/M NEC Cross-Bar NEAX61E NEC Digital NEC switch RLCM NTI Digital Remote Line Conc Module RLCM-10 NTI Digital Remote Line Conc Module RLM NTI Digital Remote Line Module RSC NTI Digital Remote Switching Center RSCI NTI Digital ISDN RSC RSLE NTI Digital Remote Subscr Line Equip RSM Digital Remote Switching Module RSS AT&T Analog Remote Switching System RSU Digital Generic Remote Switching Unit SXS AT&T E/M Step by Step