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Dialup Network In A Box » History » Version 7

laforge, 11/21/2020 05:57 PM
e1 ports / crossover cable

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{{>toc}}
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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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h2. Pictures
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!dalup-in-a-box.jpg!
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!commander_basic2.jpg!
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h2. Ethernet Switch configuration
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We have an old 16-port gigabit ethernet switch (DELL PowerConnect 2716) in our setup.
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h3. VLAN 1 (admin)
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* Port  1: untagged
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* Port  7: PC eth1 (tagged)
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* Port  8: admin laptop (tagged)
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h3. VLAN 11 (admin)
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This is a "jumper" from VLAN 1 (untagged) to VLAN 11 (tagged) as the switch doesn't natively support its web interface on a tagged IP
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* Port 4: untagged
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* Port  7: PC eth1 (tagged)
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* Port  8: admin laptop (tagged)
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h3. VLAN 3999 (uplink)
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* Ports 9..16
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* Port  8: admin laptop (tagged)
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h3. VLAN 4000 (auerswald)
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* Port  2: Auerswald (untagged)
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* Port  7: PC eth1 (tagged)
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* Port  8: admin laptop (tagged)
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h3. VLAN 4001 (PM3)
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* Port 3: PM3 (untagged)
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* Port 7: PC eth1 (tagged)
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* Port 8: admin laptop (tagged)
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h2. E1 configuration
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h3. E1 ports on the atom1u machine with DAHDI + freeswitch
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The ports are allocated as follows:
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* Port E1/1: Auerswald
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* Port E1/2: PM3
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* Port E1/3: Unused
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* Port E1/4: Unused
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The ports, as well as those of the portsmaster + auerswald are brougiht out on the keystone patch panel.  They must be connected as stated above  using *E1 cross-over cables*.  those have a special pin-out, and are not to be confused with Ethernet cables (straight or cross-over).
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h2. IP Network configuration
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h3. VLAN 1/11 (admin)
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|_.IP|_.Host|
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|192.168.2.1|dell2716 switch|
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|192.168.2.100|admin laptop|
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|192.168.2.254|atom1u|
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h3. VLAN 3999 (uplink)
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|_.IP|_.Host|
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|DHCP|atom1u|
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h3. VLAN 4000 (auerswald)
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|_.IP|_.Host|
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|192.168.0.240|[[Auerswald Commander Basic2]]|
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|192.168.0.254|atom1u|
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h3. VLAN 4001 (PM3)
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|_.IP|_.Host|
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|192.168.3.1|[[Livingston Portmaster 3]]|
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|192.168.3.100|telnet/rlogin host (atom1u)|
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|192.168.3.254|default-gw (atom1u)|
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|192.168.4.0/24|PPP lease pool|
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