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Dataset card Data Studio Files
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!
!
!
!
**** !
*CL* --------!--------
****===========4ESS=====>
- 4ESS=
**** - ! ! !
*CL*======DACS=! ! CNI==>
**** -DACS ! CNI
-DACS= !
- ! 1PSS====>
- !=1PSS
-
-----------------
AT&T Service
Node
The above diagram shows first how an AT&T Customer with ISDN can either
continue service with his local telephone co. or go with a direct link to the
AT&T Service Mode. All lines going to an AT&T Service Node whether through
Bell or a direct link terminate on either the 4ESS or the DACS.
When a line terminates on a DACS it serves as an Integrated Access
Distributor and sends the call to the 1PSS (Packet Switch) for Acunet Packet
Service or to the 4ESS and then eventually out to the AT&T Network.
The AT&T Internodal Network
---------------------------
In the internodal network facility, AT&T is in the process of deploying both
digital lightwave and digital radio systems.
Lightguide Systems :
In areas where growth is low, the FT3C and FTX180 Single mode terrestrial
lightguide systems will be used between nodes.
On high growth routes AT&T will install fiber pairs at line rates of 1.7Gb/s
with 20 mile repeater spacings.
Digital Radio :
In the digital radio area, 4Gb/s systems such as the TD-90 and the TD-180
provide a vehicle for rapid expansion of digital connectivity.
ISDN and Digital Switches
=========================
AT&T has redesigned the 5E Switching Modules in such a way that they are
fully compatible with ISDN, but many of the existing 5E's and other switches
were manufactured without ISDN capability. To meet this need, AT&T has
produced ISDN interfaces that modularly connect to the system. Here is a
diagram of a 5ESS Switching Module with interfaces :
Key
---
$ = ISDN V/D Terminal or Video Phone
% = Standard Telephone
= = Digital Line
< = In-Band Line
ISLU = Integrated Services Line Unit
PSIU = Packet Switch Interface Unit
--------------------------
- 5ESS -
- Switching -
- Module -
- -
------------=----=--------
- = = -
$====-----======== = -
- - = -
$====- - --------=--- -
-ISLU- - - -
%<<<<- ===== PSIU - -
- - - - -
$====--------------------------
The two new hardware additions are :
<1> Integrated Services Line Unit and
<2> The Packet Switch Interface Unit
These units allow a LOCAL 5ESS (or other digital) Switch to serve both ISDN
and non-ISDN customers. These interfaces are integrated into a switching module
in a way that will allow ISDN customers to maintain all their previous Bell
services like Local Calling. Notice also that all lines, whether ISDN or not,
terminate on the ISLU.
Calling Party Identification
============================
Discussed briefly in the preface of this phile, the ISDN enhanced Calling
Party Identification service offered by AT&T ISDN will be into service along