INTRODUCTION
The MC145572EVK U-Interface Transceiver Evaluation Kit provides Motorola ISDN customers a convenient and efÞcient vehicle for evaluation of the MC145572 ISDN U-Interface Transceiver. The approach taken to demonstrate the MC145572 U-Interface Transceiver is to provide the user with a fully functional NT1 (Network Termination Type 1) connected to an LT (Line Termination). An NT1 provides transparent 2B+D data transfer between the U- and S/T-Interfaces. In addition, it provides for network initiated maintenance procedures. The MC145572EVK does not terminate any ISDN call control messages. It also does not terminate any maintenance messages received over the S/T-Interface.

FEATURES
General
• Provides Stand-Alone NT1 and LT on Single Board
• On-Board 68HC05 Microcontroller with Resident Monitor Software
• Convenient Access to Key Signals
• NT1 and LT Software Development Platform

Hardware
• + 5 V Only Power Supply
• ÒPush-ButtonÓ Activation of U-Interface from NT1
• Stand-Alone Operation for Bit Error Rate Testing
• Gated Data Clocks Provided for Bit Error Rate Testing
• Can Be Used as a U- or S/T-Interface Terminal Development Tool
• On-Board 5 ppm LT Frequency Reference
• EIA-232 (V.28) Serial Port for Terminal Interface

Software
• Stand-Alone or Terminal Operation
• Resident Firmware Monitor for User Control of Board
• Activation and Deactivation Menus
• Embedded Operations Channel
• Microcontroller Controlled or Automatic Activation/Deactivation
• Access to All Maintenance Channels
• MC68HC05 Assembly Language Source Code Available