ADTRAN 606, 612, 616, 624, 604 L2 Protocol TDM T1 Protocol PPP, L2 Protocol TDM T1 Protocol FRE

Section 4 User Interface Guide Total Access 600 Series System Manual

L2 PROTOCOL (TDM FIRMWARE) – T1 INTERFACE

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 AUTO (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 AUTO 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 AUTO 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.

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