Many Terminal Adapters also offer two R ports, which are ordinary 6-contact
RJ-11 jacks into which the user may plug a plain analogue telephone, a fax
machine,or even an analogue modem. The jacks appear like two ordinary phone lines
and in fact both can be used simultaneously just like the digital phones.
According to the international standard, up to eight directory numbers can be mapped
to one ISDN copper pair, any two of which (as digital phones, analog phones, or 64
kbps digital data channels) may be active simultaneously. A subsequent incoming
call, if both B channels are in use, will receive a busy signal, with one very important
exception.
Many Terminal Adapters offer Bandwidth On Demand (BOD/BACP) allowing them to
be programmed to operate optionally at 128 kbps but automatically fall back to 64 kbps
if a phone call comes in. This is one of ISDN’s unusual features which makes it so
useful in commercial use.
A device incapable of connecting to the S/T bus is called a TE2 device and requires a
Terminal Adapter to convert the signalling.
Terminal Adapters also exist in specialized form combining for example an Ethernet-
compatible multi-port router, or one or more analogue modems.
Installing an ISDN Telephone Line
ISDN service is available at any location in Bangkok or the provinces within a distance
of 5.5 km of an ISDN-enabled Central Office; check with your local service provider. In
many locations both TOT and TelecomAsia will offer service; pricing and technical
features are identical; in some places only one or the other will be physically able to
offer coverage. Regardless of which provider you choose, be sure to obtain from the
TOT Marketing Department their current list of hardware providers.
ISDN SERVICE PROVIDERS
Provider Sign-up Tech Query Remark
Number Number
Telephone Local area 574-8610 Offers both BAI and PRI
Organization commercial Marketing Department at 574-8617
of Thailand service center can fax on request a useful
(consult phone overview (in Thai) with
<www.tot.or.th> directory) listing of hardware vendors
TelecomAsia 900-9091 900-9091 Presently promotes only PRI
to commercial customers
<www.telecomasia.co.th>
A TT&T representative advises that her firm will instead offer ADSL for the broadband
needs of its customers outside Bangkok.
4
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