Permanent Virtual Circuit (PVC) per ATM forum UNI version 3.1.
Three virtual circuits, with one that is actively connected to a service provider; encapsulated as PPP.

 

SPECIFICATIONS AND DATA

A

 

 

 

 

 

 

 

 

WAN INTERFACE SPECIFICATIONS

RY

 

ADSL (Asymmetric Digital Subscriber Line)

 

 

A

 

Maximum transmission rate:

 

 

 

 

 

 

Downstream

 

1.5 Mbps

 

 

 

 

Upstream

 

512 kbps

 

 

 

 

 

 

 

 

 

 

Minimum transmission rate to sync

64 kbps

 

 

 

 

 

 

Rate-adaptive data rate resolution

32 kbps increments

 

 

 

 

 

 

 

 

N

 

 

 

 

Signal Format

 

 

I

 

 

 

 

 

DMT (Discrete Multitone) line code

 

 

 

Connector

 

RJ-11

 

 

 

 

 

 

ATM (Asynchronous Transfer Mode)

 

 

 

 

 

 

ATM Adaptation Layer

 

AAL5 (ITU I.363.5) - Supports encapsulation and

 

 

 

 

M

 

 

 

 

 

 

Ide-encapsulation of AAL5 Protocol Data Units (PDUs) for

 

 

 

convergence. Segmentation and Reassembly (SAR) layer

 

 

 

segments and reassembles AAL5 PDUs into ATM cells that are

 

 

 

48-byte SAR-PDUs.

 

 

 

 

ATM Layer

 

Attaches or strips the 5-byte header to the 48-byte SAR-PDU.

 

 

 

Performance is a maximum line rate of 17,812 cells per second

 

 

 

downstream and 2,189 cells per second upstream.

 

 

Cell Format

 

Format complies with ITU I.361 ATM cell format. Cell delineation

 

EL complies with ITU I.432 Cell Delineation and HEC. Cells are fixed

PR

 

length (53 bytes), including 5 bytes of header and 48 bytes of

 

payload. Included in the header are the VPI and VCI number.

 

 

 

 

 

 

 

Virtual Circuit type

Maximum Virtual Circuits

Megabit Modem 500L Installation Manual

61