Datasets:
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Dataset card Data Studio Files
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prints out reports from EADAS's traffic data.
The first or lowest level of these centers is the Network Management
Centers. There were 27 EADAS/NM supported NMCs across the United States as of
1983. The NMC was described above, as well as the systems it used.
==============================================================================
Some of this information was taken from Bell System publications and from
trashed materials, and may not be the same for every area. All material is
correct to the best of the author's knowledge. Thanks to The Marauder for
supplying some information. This file was written for educational purposes
only.
-End Of File-
Written March, 1987
==Phrack Inc.==
Volume Two, Issue 12, Phile #6 of 11
/\ /\
<[]>==========================================<[]>
\/ ^ ^ \/
|| PLP [+]The Executioner[+] PLP ||
++ ^ ^ ++
|| [+] PhoneLine Phantoms! [+] ||
++ ++
|| CSDC - Hardware Requirements ||
++ ----------------------------- ++
|| PLP | PHRACK XII - PHRACK XII | PLP ||
/\ ----------------------------- /\
<[]>==========================================<[]>
\/ Phreak Klass Room 2600 = 806-799-0016 \/
|| _______________ Login: Educate ||
++ |The only BBS | Sysop:Egyptian Lover ++
|| |that teaches.| Cosysop:The Executioner||
/\ --------------- Board lose:Oryan Quest /\
<[]>==========================================<[]>
\/ \/
Preface:
========
This is the second part of my CSDC (Circuit Switched Digital Capability)
series, the first being in PHRACK X. It is suggested that you read the first
part and also the file on PACT in PHRACK XI. If I feel the material was not
covered completely, I will make a third addition to this file.
Hardware Interfaces
===================
A NCTE or equivalent network interface equipment, located on the customer
premises, is required to provide the CSDC feature for a customer. The NCTE or
an equivalent circuit, located on the customer's premises, is required to
provide TCM (Time-Compression-Multiplexing) transmission on the 2-wire
subscriber loop. The NCTE also has a remote loopback for testing from CSDC
central office.
Dedicated 2-way CSDC trunk circuits are provided via DCT (Digital Carrier
Trunk) combined alternate data/voice (CADV) units with DCT supervision. MF and
CCIS signalling is allowed on these trunks. They provide signalling, switching
and trunking functions between 1A ESS switch and other CSDC offices. To
provide CSDC, the DCT bank must be equipped with alarm and digroup control
units. A Digital Office Timing Supply (DOTS) is needed to provide network
synchronization for the CSDC feature. A minimum of 3 CSDC maintenance circuits
are needed for the CSDC feature to operate. The circuit provides digital
signals for testing CSDC trunks and loops. They also provide a test
termination for incoming CSDC calls. If an office has superimposed ringing for
4 and 8 party lines, these ringing circuits may be used for loop testing with
the maintenance circuit.
Remote Switching System
=======================
The RSS remote frame contains eight special service slot positions that can be
used for D4 type plug in units (basically allows the RSS to have CSDC
abilities). This allows the CSDC TRXS (Time Compression Multiplexing Remote
Subscriber Exchange) channel units to be housed in the RSS frame. The CSDC
feature is provided via the RSS T1 carrier facilities. The T1 carriers for
CSDC service terminate with position 1 and 0 at the RSS. A ringing and tone
plant is required in the RSS office to ring the phones of special service
channel unit subscribers.
Operation of the CSDC
=====================
An off-hook origination initiates the seizure of an originating register.
A line translation is performed and the CSDC indicator is received from the
Line Equipment Number Class (LENCL) and is stored in the register. A touch
tone service receiver is connected to the line and dial tone is applied. Upon
receiving a digit, dial tone is removed. If the first digit is a '#', digit
collection is set up to collect 2 more digits. Upon receipt of the 2 digits
(99), the PACT (Prefix Access Code Translator) is indexed via the dialed
digits to determine what service has been requested. If the line cannot have
CSDC, an error message is sent. The AB digits (carrier selection) are
collected next. Once the AB digits have been determined to be valid, the CCOL
(Chart Column) is received. The CCOL merely is a code to tell the PACT what is
to be done. Once the AB digits and the CSDC CCOL is received, the original