Thrane&Thrane TT-3080A, User Manual, Page: 22 / 124

The Capsat® Messenger The Capsat® Messenger The Capsat® Messenger The Capsat® Messenger Hardware interfaces Hardware interfaces Hardware interfaces Hardware interfaces
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This interface can be used for connection of ISDN equipment –
data as well as voice/picture based equipment (phones, audio
codecs or video conferencing equipment).
The only exception is that normal terrestrial Basic Rate ISDN (BRI)
is based on 2 channels (128 kbit/s Data) and 1 D channel (16 kbps
Signalling). The Capsat® Messenger has 1 B channel (Data) and 1
S channel (simulated D channel) which combined equals a total
bandwidth of 64kbps. Please ensure that your ISDN equipment
has the possibility of supporting 1 B channel, otherwise it will not
work.
The following services may be used on the ISDN interface:
• 64 kbit/s UDI
• 56 kbit/s UDI
• Speech
• 3.1 kHz audio
•
mini-M voice
Equal to the terrestrial ISDN network the terminal offers the
possibility to have more than one device connected to this
interface. Each device can be individually addressed when called
and the service type can be selected individually. This requires
that the attached equipment supports MSN (Multiple Subscriber
Number). Depending on the brand of equipment it may be
possible to program the equipment with more MSNs. If a device
should respond to a certain IMN number, it must be programmed
in the ISDN equipment using the IMN as MSN. Note that the
equipment will only react if both MSN as well as service type
(speech, 3.1 kHz audio, 64 kbit/s or 56 kbit/s) fits with the ISDN
equipment.
Please note that the ISDN interface supports data transmission of
64 kbit/s (one B-channel) as opposed to 2 times 64 kbit/s (two B-
channels) available on the terrestrial ISDN network and that the
delay is also greater. Not all standard ISDN devices are equally
good at coping with these differences.