RoadRunner
U S E R S G U I D E
24
Terminal Adapter TA201 and TA301 Configuration for North
America
The TA201 terminal adapter provides one S/T interface for one ISDN
BRI (2 x 64 or 2 x 56 kb/s) line. In North America, the Telco provides a
‘U’ interface, therefore an external NT-1 must be used between the
RoadRunner
and the wall jack. Elsewhere, the Telco provides an S/T
interface and an external NT-1 is not needed. The TA201 contains all
country specific configuration and provisioning information in
memory, and there is no need to change ROM chips when using your
RoadRunner
in a different country.
The TA301 is identical to the TA201 except that it contains a built-in
NT-1 and connects directly to the ISDN ‘U’ interface provided in North
America.
RoadRunner
units intended for use in North America will be
shipped with the TA301 unless specified otherwise.
Probably the most confusing aspect of ISDN codecs is configuring the
Terminal Adapter for the ISDN in your area. This is especially true in
North America, where there are several local ‘flavors’ of ISDN that are
all provisioned differently. Elsewhere, configuration of the terminal
adapter may be as simple as insuring the proper country is selected.
In North America, the ISDN service provider must supply certain
information to correctly configure the Terminal Adapter:
•
ISDN ‘flavor,’ e.g., National ISDN or Custom.
•
Service Provider Identification Numbers (SPID numbers).
National ISDN
always
requires SPID numbers, but some
locations using Custom ISDN may
not
require SPID numbers.
If SPID numbers are required, most areas use two, but some
implementations require only one.
Selecting Country and Switch Type
It is necessary to tell the TA what type of switch protocol is being used
at the Telco central office. The ISDN service provider will give this
information to you. You only need to set the switch type once for each
TA since it is impossible to have different switch types for the
individual ‘B’ channels in an ISDN line. Select
<TA
x
01><Setup><N. America><Sw type>
Select
5ESS CUST
only for AT&T
Custom service.
For 5ESS National
ISDN, select
NI1
.
You can skip to
the next section
(Page 26) if you
are using the
TA201 outside
North America.