Osmocom icE1usb¶

For general information about this open source hardware device (manual, hardware design, schematics, gateware, firmware, ...), see icE1usb.

In case anyone is interested in purchasing a fully assembled icE1usb for retronetworking purpose, sysmocom is offering radical discounts if you contact sales@sysmocom.de and explain what you want to use it for.

Using the icE1usb with DAHDI driver to provide a S2m line¶

This configuration will provide an S2m line that behaves like a german Primärmultiplexanschluss/PMX.
The framing/checksumming configuration required might be different for other countries.

The icE1usb ships in TE mode. You either need to use an E1 cross-over cable or change the jumpers inside the icE1usb.
Ethernet cross-over cables are different and do not work!

/etc/dahdi/system.conf:

# Span 1: icE1usb/1/0 "Osmocom icE1USB Card 1 Span 0" (MASTER) 
span=1,0,0,ccs,hdb3,crc4
# termtype: nt
bchan=1-15,17-31
dchan=16

# Global data
loadzone        = de
defaultzone     = de

Apply the config using:

dahdi_cfg -v

Then create the span assignments using:

dahdi_span_assignments dumpconfig > /etc/dahdi/assigned-spans.conf

To use Asterisk, create /etc/asterisk/dahdi-channels.conf:

; This is not intended to be a complete chan_dahdi.conf. Rather, it is intended
; to be #include-d by /etc/chan_dahdi.conf that will include the global settings
;

; Span 1: icE1usb/1/0 "Osmocom icE1USB Card 1 Span 0" (MASTER) 
group=0,11
context=from-pstn
switchtype = euroisdn
signalling = pri_net
channel => 1-15,17-31
context = default
group = 63

and /etc/asterisk/chan_dahdi.conf:

[trunkgroups]

[channels]
language=de
switchtype=euroisdn

echocancel=no
echocancelwhenbridged=no

transfer=no

pridialplan=unknown
prilocaldialplan=unknown
internationalprefix = 00
nationalprefix = 0
overlapdial=yes

#include dahdi-channels.conf

(careful: that #include is not a comment)