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Dialup Network In A Box » History » Version 1

laforge, 01/01/2020 02:38 PM

1 1 laforge
h1. Dialup Network In A Box
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This is a self-contained, portable telephony network which allows us to connect and analog modems and ISDN adapters at retrocomputing events.
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The setup (as of Q4/2019) consists of:
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* [[Auerswald COMmander Basic2]] PBX with 8x S0 (ISDN BRI) ports, 16x a/b (analog) ports, 8x Up0 (ISDN) ports and 1x S2M (E1 ISDN PRI)
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* 1U Rack-Mount Atom PC with 4-port E1 (DAHDI) card and FreeSwitch: Emulates public telephone exchange
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* [[Livingston Portmaster 3]] RAS with ability to terminate 30 ISDN or analog modem calls
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h2. Telephony Setup
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The physical setup looks like this:
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{{graphviz_link()
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digraph G{
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  rankdir = LR;
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  CB2 [label="Auerswald\nCommander Basic2"];
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  PM3 [label="Livingston\nPortmaster 3"];
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  ISDNTA1 [label="ISDN TA"];
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  ISDNTA2 [label="ISDN TA"];
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  ISDNTAN [label="ISDN TA"];
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  Modem1 -> CB2 [label="Analog Line"];
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  Modem2 -> CB2 [label="Analog Line"];
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  ModemN -> CB2 [label="Analog Line"];
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  ISDNTA1 -> CB2 [label="ISDN BRI (S0) Line"];
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  ISDNTA2 -> CB2 [label="ISDN BRI (S0) Line"];
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  ISDNTAN -> CB2 [label="ISDN BRI (S0) Line"];
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  CB2 -> FreeSWITCH [label="ISDN PRI (E1) Trunk"];
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  FreeSWITCH -> PM3 [label="ISDN PRI (E1) Trunk"];
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}
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}}
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h2. Logical Setup:
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This shows the logical setup including PCs and associated software:
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{{graphviz_link()
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digraph G{
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  rankdir = LR;
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  PC1 [label="DOS PC 1"];
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  PC2 [label="DOS PC 2"];
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  CB2 [label="Auerswald\nCommander Basic2"];
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  PM3 [label="Livingston\nPortmaster 3"];
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  ISDNTA1 [label="ISDN TA"];
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  TERM1 [label="Terminal Program"];
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  TERM2 [label="Terminal Program"];
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subgraph cluster_client1 {
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  label="Dialup User 1";
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  TERM1 -> PC1;
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  PC1 -> Modem1 [label="RS232"];
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}
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subgraph cluster_client2 {
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  label="Dialup User 2";
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  TERM2 -> PC2;
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  PC2 -> ISDNTA1 [label="RS232"];
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}
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  Modem1 -> CB2 [label="Analog Line"];
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  ISDNTA1 -> CB2 [label="ISDN BRI (S0) Line"];
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  CB2 -> FreeSWITCH [label="ISDN PRI (E1) Trunk"];
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  FreeSWITCH -> PM3 [label="ISDN PRI (E1) Trunk"];
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  PM3 -> BBS [label="telnet"];
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}
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}}
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