Dialup Network In A Box » History » Revision 2
Revision 1 (laforge, 01/01/2020 02:38 PM) → Revision 2/13 (laforge, 01/01/2020 02:44 PM)
h1. Dialup Network In A Box
This is a self-contained, portable telephony network which allows us to connect and analog modems and ISDN adapters at retrocomputing events.
The setup (as of Q4/2019) consists of:
* [[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)
* 1U Rack-Mount Atom PC with 4-port E1 (DAHDI) card and FreeSwitch: Emulates public telephone exchange
* [[Livingston Portmaster 3]] RAS with ability to terminate 30 ISDN or analog modem calls
h2. Telephony Setup
The physical setup looks like this:
{{graphviz_link()
digraph G{
rankdir = LR;
CB2 [label="Auerswald\nCommander Basic2"];
PM3 [label="Livingston\nPortmaster 3"];
ISDNTA1 [label="ISDN TA"];
ISDNTA2 [label="ISDN TA"];
ISDNTAN [label="ISDN TA"];
Modem1 -> CB2 [label="Analog Line"];
Modem2 -> CB2 [label="Analog Line"];
ModemN -> CB2 [label="Analog Line"];
ISDNTA1 -> CB2 [label="ISDN BRI (S0) Line"];
ISDNTA2 -> CB2 [label="ISDN BRI (S0) Line"];
ISDNTAN -> CB2 [label="ISDN BRI (S0) Line"];
CB2 -> FreeSWITCH [label="ISDN PRI (E1) Trunk"];
FreeSWITCH -> PM3 [label="ISDN PRI (E1) Trunk"];
}
}}
h2. Logical Setup:
This shows the logical setup including PCs and associated software:
{{graphviz_link()
digraph G{
rankdir = LR;
PC1 [label="DOS PC 1"];
PC2 [label="DOS PC 2"];
CB2 [label="Auerswald\nCommander Basic2"];
PM3 [label="Livingston\nPortmaster 3"];
ISDNTA1 [label="ISDN TA"];
TERM1 [label="Terminal Program"];
TERM2 [label="Terminal Program"];
subgraph cluster_client1 {
label="Dialup User 1";
TERM1 -> PC1;
PC1 -> Modem1 [label="RS232"];
}
subgraph cluster_client2 {
label="Dialup User 2";
TERM2 -> PC2;
PC2 -> ISDNTA1 [label="RS232"];
}
Modem1 -> CB2 [label="Analog Line"];
ISDNTA1 -> CB2 [label="ISDN BRI (S0) Line"];
CB2 -> FreeSWITCH [label="ISDN PRI (E1) Trunk"];
FreeSWITCH -> PM3 [label="ISDN PRI (E1) Trunk"];
PM3 -> BBS [label="telnet"];
}
}}
h2. Pictures
!dalup-in-a-box.jpg!