To simplify installation, Mariposa makes some assumptions about how services should be prioritized. It gives highest importance to CBR applications, such as Structured Circuit Emulation Service, which might be used for videoconferencing. Next comes compressed voice, which rides over ATM Adaptation Layer 5 (AAL5). ILMI (Integrated Local Management Interface) and ATM Signaling take the next level of priority. Finally, Ethernet data runs over AAL5 in the lowest priority. Those who want ultimate control will be disappointed that prioritization levels can't be adjusted, but we agree with the default prioritization structure offered by the ATX-100.

The device contains an embedded HTTP server for browser-based management. After configuring an IP address from the front-panel LCD and pointing a browser to the ATX-100, it's a simple matter of setting up physical interfaces and ATM destinations. When using SVCs, the box maps E.164 addresses--assigned by a carrier when on a public network--to ATM destinations. For voice networking services, separate tables map outbound phone numbers to ATM destinations, and incoming phone numbers to a link and DS-0 timeslot.

With device management this simple and powerful, the management interface must be carefully secured. The ATX-100 has three access levels, which can be customized by a superb user administrator. This detailed security control extends beyond any other product tested. Users can be assigned no access, read/write access or read-only access to every important information element displayed at the management interface.

Equally impressive are the ATX-100's diagnostic capabilities, especially its ability to troubleshoot PBX and ATM signaling. During our tests, we were able to log DTMF digits as they passed through the network and quickly isolate configuration problems between the ATX-100 and our PBX. In addition, the ATX-100 matches the line, network and virtual circuit-level loopbacks found in the other devices. We'd like to see Mariposa add the ability to issue pings directly from the management interface, to help diagnose data connectivity problems.

With performance and management this appealing, we hungered for more from Mariposa. Unfortunately, the ATX-100 lacks frame relay interfaces for connecting legacy equipment, as well as interfaces for ATM to Frame Relay Service and Network Interworking (which you'll find in the other products). We'd also like to see IP routing added into the box, which Mariposa promises will be the case by the time you read this.