Dopiszcie informacje na temat interfejsów NT1, NT2 i urządzeniach typu R, S, T, U, (sporo osób szuka tych informacji, jako że są potrzebne np. do egzaminów :> ) lub przełumaczcie (wzięte ze strony Cisco):
"ISDN devices include terminals, terminal adapters (TAs), network-termination devices, line-termination equipment, and exchange-termination equipment. ISDN terminals come in two types. Specialized ISDN terminals are referred to as terminal equipment type 1 (TE1). Non-ISDN terminals, such as DTE, that predate the ISDN standards are referred to as terminal equipment type 2 (TE2). TE1s connect to the ISDN network through a four-wire, twisted-pair digital link. TE2s connect to the ISDN network through a TA. The ISDN TA can be either a standalone device or a board inside the TE2. If the TE2 is implemented as a standalone device, it connects to the TA via a standard physical-layer interface. Examples include EIA/TIA-232-C (formerly RS-232-C), V.24, and V.35.
Beyond the TE1 and TE2 devices, the next connection point in the ISDN network is the network termination type 1 (NT1) or network termination type 2 (NT2) device. These are network-termination devices that connect the four-wire subscriber wiring to the conventional two-wire local loop. In North America, the NT1 is a customer premises equipment (CPE) device. In most other parts of the world, the NT1 is part of the network provided by the carrier. The NT2 is a more complicated device that typically is found in digital private branch exchanges (PBXs) and that performs Layer 2 and 3 protocol functions and concentration services. An NT1/2 device also exists as a single device that combines the functions of an NT1 and an NT2.
ISDN specifies a number of reference points that define logical interfaces between functional groups, such as TAs and NT1s. ISDN reference points include the following:
•R—The reference point between non-ISDN equipment and a TA.
•S—The reference point between user terminals and the NT2.
•T—The reference point between NT1 and NT2 devices.
•U—The reference point between NT1 devices and line-termination equipment in the carrier network. The U reference point is relevant only in North America, where the NT1 function is not provided by the carrier network. "
Czy jest sens aby CLIP, CLIR, COLP i COLR były osobnymi artykułami i nie były zintegrowane z artykułem ISDN. --Qu3a 13:15, 6 mar 2007 (CET)
w polskiej Primary access (PA), a wszedzie jest tak Primary rate access (PRA)
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