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Total Access 600 Series System Manual Section 4 User Interface Guide
61200624L1-1B © 2004 ADTRAN, Inc. 101
L2 P
ROTOCOL
(ATM F
IRMWARE
) – N
ETWORK
(NET) I
NTERFACE
Configure the L2 P
ROTOCOL
parameters for these menus are identical regardless of network interface.
Therefore, the interface is denoted by
NET.
L2 PROTOCOL (ATM – NET) > PROTOCOL
Configure the
L2 P
ROTOCOL
mode. Choices are
ATM
and
C
U
MTN
(def). Selecting
ATM
configures the
interface for Asynchronous Transfer Mode signaling on Layer 2. Selecting
C
U
MTN configures the
interface for Copper Mountain frame relay signaling on Layer 2.
L2 PROTOCOL (ATM – NET) > 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 (ATM – NET) > PROTOCOL > CUMTN FRE
Copper Mountain Frame Relay (FRE) 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 P
ROTOCOL
(ATM F
IRMWARE
) – NET> ATM
Configure the L2 P
ROTOCOL
parameters and view the status of the T1 interface using ATM protocol from
this menu.
L2 PROTOCOL (ATM–NET–ATM) > CONFIG
Configure the L2 P
ROTOCOL
parameters for the T1 interface using ATM protocol.
L2 PROTOCOL (ATM–NET–ATM) > CONFIG > ATM CONFIG
Use the ATM C
ONFIG
menu to set the parameters listed below.
L2 PROTOCOL (ATM–NET–ATM) > CONFIG > ATM CONFIG > IDLE CELLS
The I
DLE
C
ELLS
format must be configured for either ATM F
ORUM
(U
NASSIGNED
) or ITU (I
DLE
). Configuring
this setting incorrectly for a particular circuit will cause poor performance at the ATM Layer. The default
is
ATM F
ORUM
(U
NASSIGNED
).