ISDN PSDN Modular Dial-in System

The Modular Dial-in System is the solution for any network provider where both analogue and digital incoming calls must be processed without extraordinary cable messes and performance absorbing equipment. If a call is recognized as coming from an ISDN dialer the Modular Dial-in System automatically directs this caller to the ethernet without claiming a PSTN modem. If an incoming call is recognized as a PTSN dialer, the Modular Dial-in System will allocate the first of the available V.34 modems to this call. Using this method, the lines will be used in a most elegant way to get the highest grade of efficiency. Thanks to the Modem Management System (MMS) with dedicated interfaces the reliability is outstanding.



ISDN rack features are:
ISDN Primary Rate Interface (S2M) 30 b-channels per PRI (max. 4 PRIs per Rack)
Up to 30 V.34 (33K6) per PRI Max 120 lines per Rack
WAN Protocol PPP or clean channel (HDLC Transparent)
Remote diagnostics & Management Racks are cascadeble
Dynamic V.34 Line capturing
Direct ethernet connection (TCP/IP)
Settings change by Remote Access
Hot pluggable modems
High reliable industrial system
Modular system, expandable without high investments
Use of existing router equipment
Single modems with individual Modem Management Interface
Real V.34 modems, no emulation



Modem commands are:
Read/write date of internal clockSwitch modem off
DCD time-outSwitch modem on
DTR check time-outSelect rack
DTR dropReset modem
DTR setReset all modems of all racks
DTR connected to MMS backReset all modems in rack
Get rack settingsSet # of rings before reset
Telephone line disconnected (busy)Connect serial to modem
Telephone line connectedReset after RXD time-out
Get log fileSave string to MMU memory
Delete the log fileSend saved string to modem(s)
Modem serial settingsSet password
Automatic reset/off check MMIStatus of modems
Read/write time of internal clockReset after TXD time-out

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.
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