User's Guide

2110059 Rev 1.1 Proprietary and Confidential Page 95
11. Multipurpose Interface Board
11.1. Introduction
The Multipurpose Interface Board (MIB) is a
development aid to facilitate testing and
configuration of the SB300 Series modems by
allowing communication using a standard RS-232
serial connection. It also provides monitoring
LEDs, test points, connections for a protocol
analyzer, and connections for wireline (PSTN)
hookup.
There is also support for the SB220 and SB301/302
modems. These supports are provided for factory
level testing only and are beyond the scope of this document.
NOTE
Although the MIB provides support for the full SB Series of modems, it is not intended
to support more than one modem at a time. Attaching more than one modem can
damage circuitry.
For a quick initial setup go to Section 11.8. To get a fuller understanding of the board’s
connections and capabilities sections are provided as follows:
• Section 11.2 Board Description with schematic and parts layout reference.
• Section 11.3 Power Supply including voltage control and supplying power from a host device.
• Section 11.4 Connections describing the various host, modem, and analyzer connectors.
• Section 11.5 Jumpers details options and setups.
• Section 11.6 Serial Breakout Box describes cross wiring correction and signal checking
• Section 11.7 Test Points identifies what is offered and where to find it
11.1.1. Features
The MIB offers these features:
• Supports SB220, SB300, SB302, SB320
• RS232 to 5V HCMOS conversion
• Interception of 5V HCMOS control signals from host to modem to verify syntax and levels
• Intercepted signals are converted to RS-232 for observation by standard serial port
• Supports wireline access
• Serial port breakout box to resolve cabling difficulties
• Serial port status LEDs
• Status line LEDs and pullup/down
• Current, DISC and KEY test points
• Reset button for SB300 and SB320
• Annunciator to hear dial tones
• Comm Analyzer connectors - 25 pin protocol analyzer
• Uses wall adapter for power