Girl Geekette

0 Echo Reply 
3 Destination Unreachable 
4 Source Quench 
5 Redirect 
6 Alternate Host Address 
8 Echo 
9 Router Advertisement 
10 Router Solicitation 
11 Time Exceeded 
12 Parameter Problem 
13 Timestamp 
14 Timestamp Reply 
15 Information Request 
16 Information Reply 
17 Address Mask Request 
18 Address Mask Reply 
30 Traceroute

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

Reference Point - Logical Interface Between 
R - TE2 and TA 
S - TE1 and NT2 
T - NT1 and NT2 
U - NT1 and Local Terminal