Instruction manual

Total Access 850 System Manual Section 4 User Interface Guide

L2 PROTOCOL (T1 ATM FIRMWARE) – T1 INTERFACE

Configure the L2 PROTOCOL parameters and view the status of the T1 interface using items from this menu.

L2 PROTOCOL (T1 ATM – T1) > PROTOCOL

Configure the L2 PROTOCOL mode. Choices are ATM and CUMTN (def). Selecting ATM configures the

interface for Asynchronous Transfer Mode signaling on Layer 2. Selecting

CUMTN configures the

interface for Copper Mountain frame relay signaling on Layer 2.

L2 PROTOCOL (T1 ATM – T1) > PROTOCOL > ATM

Asynchronous Transfer Mode allocates bandwidth on demand, automatically adjusting the network

capacity to meet the system needs. Fixed-length cells (53 octet) require lower processing overhead and

allow higher transmission speeds than traditional packet switching methods. ATM uses five octet headers

in each fifty-three octet cell to match cells with specific virtual channels to which they belong.

L2 PROTOCOL (T1 ATM – T1) > PROTOCOL > CUMTN

Copper Mountain Frame Relay is a data link layer protocol that uses Frame Relay instead of ATM on the

subscriber loop. Frame relay is a switched layer protocol that handles virtual circuits using High-Level

Data Link Control (HDLC) encapsulation. Frame Relay uses statistical multiplexing as opposed to

time-division-multiplexing many logical connections over a single physical link.

L2 PROTOCOL (T1 ATM FIRMWARE) – T1 INTERFACE > ATM

Configure the L2 PROTOCOL parameters and view the status of the T1 interface using ATM protocol from

this menu.

L2 PROTOCOL (T1 ATM–T1–ATM) > CONFIG

Configure the L2 PROTOCOL parameters for the T1 interface using ATM protocol.

L2 PROTOCOL (T1 ATM–T1–ATM) > CONFIG > ATM CONFIG

Use the ATM CONFIG menu to set the parameters listed below.

L2 PROTOCOL (T1 ATM–T1–ATM) > CONFIG > ATM CONFIG > IDLE CELLS

The IDLE CELLS format must be configured for either ATM FORUM (UNASSIGNED) or ITU (IDLE). Configuring

this setting incorrectly for a particular circuit will cause poor performance at the ATM Layer. The default

ATM FORUM (UNASSIGNED).