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

nanoPi R5S configuration¶

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 on the @lan22 port (local admin port)

Siemens Fastlink¶

TBD