|
ISDN REFERENCE POINTS |
|
|
REF. POINT |
DEFINITION |
|
R |
·
between
the TE 2 (Terminal Equipment 2) and the TA (Terminal Adapter) |
|
S |
·
between
the ISDN CPE (either the TE 1 or the TE 2/TA) and the NT 1 |
|
T |
·
between
the customer PBX (NT 2) and the local loop termination (NT 1) |
|
S/T |
·
between
the ISDN CPE and the local loop termination (NT 1) - S/T integrated interface
for BRI only |
|
U |
·
Telco
network termination up to the NT 1 device;
also referred to also as U-Loop |