ISDN POTS V5 Event Configuration¶

This page documents the configuration of our ISDN/POTS V5 access network for evens like the ISDN_at_CCC_Camp_2023

Nokia EKSOS wooden racks¶

We currently have 3 setups using NOKIA EKSOS N20 racks. They contain:

Nokia EKSOS N20 shelf
- NCU (main CPU card) with V5/E1 and Q3/Ethernet interfaces
- any number of PSTN + ISDN BRI line cards (PSTN: 32 ports per card, ISDN: 16 ports per card)
- home-made unit for N20 shelf containing
  - nanopi R5S as Linux SoM
    - LAN1 port used for Q3 to NCU
    - WAN port used for uplink/back-haul\
    - special re-work applied internally to power the R5S from 12V DC without any USB-PD logic
  - icE1usb as USB-E1 interface towards the NCU
48V power supply (trimmed up to ~ 52V) for N20 shelf
12V power supply for fans + nanopi R5S
3x 120mm fan (1200 rpm) 12V mounted above N20 rack, airflow in upwards direction
50-port ISDN patch panel configured as
- ports 1-16: first 16 ports of PSTN card in slot U3
- ports 17-32: first 16 ports of PSTN card in slot U5
- ports 33-48: ISDN line card in slot U7
- ports 49-50: unused

The nanoPI R5S is configured as follows:

Plain Debian 12 installation using https://github.com/inindev/nanopi-r5
osmo-e1d package from osmocom:nightly feed
- octoi client to connect to remote octoi server
network config
- DHCP on the wan port (back-haul/uplink)
- software-bridging (q3br) between lan1 and a q3vx VXLAN device using group 3 on multicast group 239.1.1.1 on the wan port
- static IP 192.168.2.1 on the lan2 port (local admin port)

Each AN is configured to have

Name	Datenklo	Number	Q3 MAC	V5 Interface ID	R5S WAN MAC	R5S WAN IP	e1_line
Berlin	Q13	A108.2	00:40:43:f8:55:4a	7108	b4:22:52:84:71:26	10.20.23.145	4
Leipzig	Q8	A096.1	00:40:43:f8:a3:2a	7096	28:2c:44:56:31:22	10.20.23.116	5
Hamburg		A107.1	00:40:43:f9:a2:d8	7107	64:2e:f8:00:66:76	10.20.34.237	3

TBD

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