ELPROMA MODEM MANAGEMENT SYSTEMS Elproma has developed a Rack modem for a special project which required the high quality standard. Now this Rack modem (MOD 288R) is available as standard in the range of Elproma data products. High performance and reliability are features of this modem, however ...... even the world's finest modem sometimes "hangs", especially when a number of modems are placed in a 19" rack. Elproma has developed the Modem Management System especially for this environment. The MMS contains a "backplane" which fits on the 19" rack system. To this "backplane" 18 Modem Extension Interfaces (MMI units) can be attached and together with the power supply they make up the complete Modem Management Unit (MMU). The MMU communicates with the MMF's using commands to detect "answer" failures and can generate a hardware reset if necessary. If this occurs "twice" the modem unit will automatically be disabled. The MMU has a fully "Remote Control" mode where the following can be done. Change the settings at the modem units. Generate a log file containing an overview of the disabled modems. Force a hardware reset. By using a separate "sysop" line to have access to these features the MMU can, if there is still an error, force modem disabling commands per modem individually.

Features are:
Read/write date of internal clock	Switch modem off
DCD time-out	Switch modem on
DTR check time-out	Select rack
DTR drop	Reset modem
DTR set	Reset all modems of all racks
DTR connected to MMS back	Reset all modems in rack
Get rack settings	Set # of rings before reset
Telephone line disconnected (busy)	Connect serial to modem
Telephone line connected	Reset after RXD time-out
Get log file	Save string to MMU memory
Delete the log file	Send saved string to modem(s)
Modem serial settings	Set password
Automatic reset/off check MMI	Status of modems
Read/write time of internal clock	Reset after TXD time-out

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