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Section 4 User Interface Guide Total Access 600 Series System Manual
90 © 2004 ADTRAN, Inc. 61200624L1-1B
L2 P
ROTOCOL
(TDM F
IRMWARE
) – T1 I
NTERFACE
Configure the L2 Protocol parameters and view the status of the Network T1 interface using items from
this menu.
L2 PROTOCOL (TDM – T1) > PROTOCOL
Configure the L2 protocol mode. Choices are
PPP
,
FRE
,
HDLC
, and
A
UTO
(def). Selecting
PPP
configures
the interface for Point-to-Point Protocol signaling on Layer 2. Selecting
FRE configures the interface for
frame relay signaling on Layer 2. Selecting
HDLC configures the interface for generic High-Level Data
Link Control signaling on Layer 2. Selecting
A
UTO
enables the Auto-config feature.
L2 PROTOCOL (TDM – T1) > PROTOCOL > PPP
Point-to-Point Protocol (PPP) is an 8-bit serial protocol which allows a PC to connect as a TCP/IP host to a
network through an asynchronous port. PPP is used for connection from a PC to an Internet Service
Provider (ISP) for Internet access. PPP works over synchronous and asynchronous circuits.
Router-to-router and host-to-network connections can be made via PPP. PPP includes error detections
which Serial Line Internet Protocol (SLIP) and other protocols do not.
L2 PROTOCOL (TDM – T1) > PROTOCOL > FRE
Frame Relay is a switched data link layer protocol that handles multiple virtual circuits using High-Level
Data Link Control (HDLC) encapsulation. Frame Relay uses statistical multiplexing as opposed to
time-division-multiplexing to multiplex many logical connections over a single physical link. It contains a
cyclical redundancy check (CRC) for detecting bad data, but leaves the error correction algorithms to be
performed by higher protocol layers. Similarly, Frame Relay uses simple congestion notification. This
notification in turn can alert higher-layer protocols to exercise flow control. These characteristics allow
Frame Relay to provide a more flexible and efficient use of bandwidth.
L2 PROTOCOL (TDM – T1) > PROTOCOL > HDLC
HDLC (High-level Data Link Control) is a group of protocols or rules for transmitting data between two
network points (point-to-point transmission). HDLC provides a low overhead system for transmitting data
over Layer 2. IP packets are encapsulated into frames with an HDLC start and end flag. Generic HDLC
protocol should be used when connecting with remote equipment using proprietary HDLC encapsulation
methods.
L2 PROTOCOL (TDM – T1) > PROTOCOL > AUTO
Setting the L2
PROTOCOL
to A
UTO
allows the unit to automatically detect the L2
PROTOCOL
from the
network.
The
L2 PROTOCOL
must be set to
AUTO
in order to use the Auto-config feature.