ADTRAN L128T user manual Small Office Home Office Soho to Corporate LAN

Chapter 1: Understanding ISDN and the Express L128/L128T

Small Office - Home Office (SOHO) to Corporate LAN

•Connects the small office or home office to the corporate LAN

•Routes IP and Internet Packet Exchange (IPX) traffic from multiple devices to the corporate LAN

•Bridges all non-routed traffic (e.g., AppleTalk)

•Provides dedicated or on-demand services

•Low-cost alternative to buying a high-end router

•Compatible with popular central site LAN access devices

		TO	TO
	1	HUB	NIC	OFF
				ON
POWER	O	10 BASE T	EIA232	2	1	ISDN

10 BT

Hub

ISDN

ISDN

Router

Server

Figure 1-5

SOHO to Corporate LAN

The Express L128/L128T provides the following basic functions:

1.LAN Bridge: Bridging provides a point-to-point connection between two LANs. The bridge learning function scans the source and destination me- dia access control (MAC) addresses of all packets on its local LAN and de- termines which packets should be transmitted over the ISDN link.

Applications include connectivity between single user or small offices to corporate LANs. The Express L128/L128T uses the Spanning Tree Algo- rithm (IEEE 802.1d-ISO/IEC10038), which provides a loop-free topology and redundancy.

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