The 2720 MainStreet Internet Termination Unit and the 2721 MainStreet Router Termination Unit are integrated routers and Data Termination Units (DTUs).

Both units provide an integrated router DTU with end-to-end path management provided by the MainStreetXpress 46020 Network Manager.

The 2720 MainStreet Internet Termination Unit provides fixed link Internet access to 128 kbit/s, while the 2721 MainStreet Router Termination Unit provides frame relay access to Ethernet-connected Local Area Networks (LANs).

The 2720 MainStreet and 2721 MainStreet units were designed to address the growing demand for affordable alternatives in the expanding corporate intranetwork and Internet access markets. Both units provide integrated network management and scalability.

By offering ISDN-like access without the cost and limitations associated with ISDN -- switched network congestion, long hold times caused by limited dedicated and semi-dedicated lines, and high capital costs associated with implementing and upgrading ISDN access -- the units are an attractive alternative for corporate telecommuting and Internet access.

Integrated Solution

The 2720 MainStreet and 2721 MainStreet units are integrated routers and data termination units. The 2720 MainStreet Internet Termination Unit provides fixed link frame relay access to the Internet, while the 2721 MainStreet Router Termination Unit provides frame relay access to Ethernet-connected LANs.

On the network side, both systems provide frame relay access at either 64 or 128 kbit/s over a single pair of copper wires at a distance of up to 7 km, and can provide data compression for throughputs up to 512 kbit/s. This provides carriers with an economical alternative to permanent switched ISDN or nailed up connections. On the access side, the units provide a single 10BaseT LAN port.

Both the 2720 MainStreet and the 2721 MainStreet units can be used with ANSI T1.601 compliant ISDN U interface repeaters to extend loop lengths beyond 7 km, over 0.5 mm/24 AWG wire.

The 2720 MainStreet System

The 2720 MainStreet Internet Termination Unit was designed to meet the needs of carriers providing home or small business Internet access, and provides IP-only access for up to four LAN devices. It is ideal for single PC connectivity to the Internet via frame relay, or to provide frame relay access to a corporate network for telecommuters.

The 2721 MainStreet System

The 2721 MainStreet Router Termination Unit provides frame relay access to Ethernet-connected computer systems. It was designed for applications requiring advanced routing features.

It provides private network operators and carriers with an integrated and managed DTU-IP/IPX router, thereby allowing carriers to deploy managed intranetwork and telecommuter services.

Use of the 2720 MainStreet Internet Termination Unit in an Internet access application showing the versatility of the MainStreet and MainStreetXpress architectures for building either narrowband or broadband internetworks.

Integrated Network Management

A key benefit to carriers for these services is an integrated router DTU with end-to-end path management provided by the MainStreetXpress 46020 Network Manager. It provides full configuration and O&M control of the interface for both units.

Support for routing functions is provided by the MainStreetXpress 45020 Node Manager. It provides full configuration and monitoring of the user routing functions.

Scalable, Expandable

The 2720/21 MainStreet system offers an evolutionary service for existing Newbridge customers. Backward compatibility allows the unit to operate with installed 2B1Q and 27LC2 line cards, FRS/FRE cards, and element and network management software. Scalability can be achieved without large capital expenditures, by adding 2720/21 MainStreet units and line cards to an existing Newbridge network.

A carrier can deploy the 2721 MainStreet Router Termination Unit in a managed intranet application for telecommuters and remote offices. Intranets can even be extended to valued suppliers and customers.