Huawei Technologies Co. Ltd EM820W 사용자 설명서

PPP provides a complete authentication mechanism. To set up a PPP connection, users must
pass authentication, ensuring a secured connection.

Multilink PPP (MP) is a technique that bundles multiple PPP links together to increase
bandwidth. It can be applied to the interfaces that support PPP, such as serial interfaces and low-
speed Packet over SDH (POS) interfaces.

PPPoE

A Point-to-Point Protocol over Ethernet (PPPoE) network consists of an Ethernet containing
many hosts. It accesses the Internet through a remote access device.

An AR can create a PPP session with the remote end by using PPPoE, and implement access
control and accounting.

An AR can function as the PPPoE server to connect to different types of PPPoE clients on the
Ethernet or function as a dial-up PPPoE client.

ATM

ATM is connection-oriented. Each VC is identified by a Virtual Path Identifier (VPI) and a
Virtual Channel Identifier (VCI). One pair of VPI/VCI values is useful only on a link segment
between ATM nodes. If a connection is broken, the relevant VPI/VCI values are released.

The Asymmetric Digital Subscriber Line (ADSL) , VDSL and G.Single-pair High Speed Digital
Subscriber Line (G.SHDSL) interfaces of the ARs support the Asynchronous Transfer Mode
(ATM).

HDLC

The High-level Data Link Control (HDLC) is a typical bit-oriented synchronization data control
protocol. It adopts the full-duplex mode and CRC check. Its transmission control function is
independent of the processing function, and it features control capabilities and can be flexibly
used.

In HDLC, Keepalive packets are used to detect the link status. On the AR, you can set the interval
for sending Keepalive packets by setting the polling interval.

ISDN

The ISDN protocol references the Open Systems Interconnection (OSI) model and implements
functions of the physical layer, data link layer, and network layer on UNI interfaces.

ISDN physical interfaces are classified into ISDN BRI and ISDN PRI interfaces.When the AR
accesses an ISDN network by using an ISDN PRI interface, the AR is directly connected to an
ISDN network-side device. When the AR accesses an ISDN network by using an ISDN BRI
interface, the AR connects to an NT1 device, and the NT1 device connects to an ISDN network-
side device.

For details about WAN features, see Feature Description - WAN.

3.2.3 VPN

The ARs provide an IP security (IPSec) mechanism to ensure high quality, interoperable, and
cryptology-based security for communication processes. The two parties in communication can

Huawei AR G3 Series Enterprise Routers
Product Description

3 Product Characteristics

Issue 02 (2012-04-20)

Huawei Proprietary and Confidential