SPECIFICATIONS AND DATA A

WAN INTERFACE SPECIFICATIONS

ADSL (Asymmetric Digital Subscriber Line)

Maximum transmission rate:

 

Downstream

7.552 Mbps

Upstream

928 kbps

Minimum transmission rate to sync

64 kbps

Rate-adaptive data rate resolution

32 kbps increments

Signal Format

DMT (Discrete Multitone) line code

Connector

RJ-11

 

ATM (Asynchronous Transfer Mode)

 

 

ATM Adaptation Layer

AAL5 (ITU I.363.5) - Supports encapsulation and

 

de-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

 

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

 

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

Permanent Virtual Circuit (PVC) per ATM forum UNI version 3.1

Maximum Virtual Circuits

32 virtual circuits that can simultaneously connect to service

 

providers for sessions encapsulated either as PPP or RFC 1483

 

Bridging/Routing

 

 

Megabit Modem 400F, 500L, 600F, and 700F User Manual

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