Livingston Portmaster 3¶

• terminates one 1E line (30 B-channels)
• provides ISDN dial-up on those channels
• provides DSP based modems in case analog modem calls should be handled.

More details to follow.

Documentation¶

• portmaster3_hardware_installation.pdf
• portmaster3_configuration.pdf
• more below (Attachments)

Spare Parts / Mods¶

Fan¶

The original fan is a Fonsan DFB0812M (DC 12V 0.1A) fan by DELTA ELECTRONICS INC. The specs seem to state 2600 RPM / 24.8 dB(A) / 29 cfm.

I found it too noisy and replaced it with a Noctua NF-A8 FLX with L.N.A (reduced to 1650 rpm / 12.9 dB(A) / 24 cfm)

Fun fact: The PM3 actually seems to have a 5V -> 12V DC/DC upconverter just for the fan - instead of simply using a 5V fan...

Power Supply¶

One of @laforge's PM3A-E1 had a broken power supply. The oroginal PSU is an ASTEC LPS1112 rated for 5V/22A output (80W convection cooled, 1120W with 30cfm forced air).

It was replaced with a Mean Well LRS-150F-5. Mechanical assembly via a custom adapter plate that was fabricated easily from a small piece of aluminium sheet metal with a few drill holes.