Girl Geekette

ISDN BRI - Two B (bearer) channels at 64 KBPS each and one D (Data) channel at 16 KBPS (144Kbps total bandwidth) 128 max speed
ISDN PRI - 23 B channels at 64 KBPS each and one D channel at 64Kbps (1.54 MBPS)

E - existing, telephone network
I - Concepts, terminology and services
Q - signaling and switching

Terminal Adapter - TA - Converts RS-232, V.35 and so forth into BRI signals 
Terminal End Point 1 - TE1 - ISDN standard terminal Equipment - User Terminal 
Terminal End Point 1 - TE2 - Before ISDN standards, requires terminal adapter (TA) - NON ISDN 
Network Termination 1 - NT1 - Converts BRI signals for use by ISDN 
Network Termination 2 - NT2 - Indicates a device that supports on-premise ISDN (PBX) layer 2 and layer 3 
Local Termination - LT - Part of the local exchange that terminates local loop - Line Transmission 
Exchange Termination - ET - Part of the exchange that communicates with other ISDN components