Zoran

I think taht you have to activate S-Bus mode on Btu-B
Position 410-417

These switches control the S- and T-interface termination and the S-interface power feeding for the links 0...7.

Note
At the end of each line a 100 Ohm termination resistor must be installed (e.g. in the last wall outlet).
The switch 1 selects the termination on the transmitter interface and switch 2 selects the termination on the receiver interface. The switches 3 and 4 enable the remote power feeding to ISDN terminals connected to a link. When connected as S-interface the switches 1...4 should be set to ON.
Position 418


Note
When selecting as S- or T-interfaces, start by setting the T-interfaces using the switches 4, 3, 2 and 1 in consecutive order, then set the S-interfaces starting with the switches 1, 2, 3 and 4.

Finnaly, in BMS set those circuts to S-Buse function.
Before setting up this switches, uninstall the card, clear the slot and install card again with new setup.

Dave Higton

Thanks for your reply, Zoran.

The Trend handset supplies the termination. My oscilloscope shows me
exactly the sort of waveforms I would expect for a working S or T
interface; I have Layer 1 communication. The problem appears to be
that the BTU-B2 card doesn't send anything at all in the D channel,
even in response to the messages (to the broadcast TEI) from the
Trend handset. Although the hardware is clearly enabled and working,
I think I must have to enable something in software to permit the BTU-B2
to communicate in the D channel.

What is BMS?

I don't know how the switch is administered. I inherited responsibility
for it, along with several other switches, when my company made
redundant the technician responsible for them. I can see (physically)
an Ethernet connection to the CPU card, but I have no idea what its
IP address is, and unfortunately the entire company LAN has been
reorganised so that I don't even know how to connect to it any more.
I assume there was a serial terminal connection like for the MD110
(I have one of those too!) but I'm not sure where this was, and I
have no idea how to drive it. (I have the Alex documentation for
the MD110 but not for the BP.)

Dave

Zoran

I still think that you have enable S-Bus bunction on Btu-B2 card to enable connection ISDN handset but without RASC or BMS this is not possible.
RASC - old Ericsson software for programming and maintenance of BP50 or 250 systems up to release 13 (DOS based)
BMS - Ericsson software (replacing RASC) for programming and maintenance of BP50, BP 128i and BP250 systems from R11 and up (latest R16).
With this software you will be able to change link parameters (master or slave, TEI or MSN settings) necessary for connection of this type of equipment. Connection to BP systems is by default via CPU but RS-232 (serial COM port), not Ethernet. There is no LAN ports on BP CPU. LAN port is provided thru IPU card (supported in latest software releases). Also, documentation for BP is available in BMS or as standalone application (with PDF documents). Alex version doesn't exist.
With all this problems, it's very hard to move forward. Best way to solve this problem will be to find some company who supports BP to come and make changes for you but if I can help somehow, please let me know...you can always send me an email.

Zoran

Dave Higton

The connector from the CPU card is labelled "RASC" so that pretty much
determines what I need. Also, what I thought was an Ethernet switch
turns out to be a terminal server (I was fooled by row of RJ-45 sockets
along the front, which are for multiple clients).

Note that the Trend handset is not just an ISDN terminal: it's an ISDN
tester, i.e. it emulates the ISDN cloud. It should behave like a Basic
Rate trunk.

Version number: the two PROMs on the CPU card have "R3E" on them -
does this look like a plausible version number?

Dave