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==Phrack Inc.==
Volume Two, Issue 19, Phile #3 of 8
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
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|_| |_|
|_| Understanding the Digital Multiplexing System |_|
|_| (Part2) |_|
|_| |_|
|_| by |_|
|_| |_|
|_| Control C |_|
|_| |_|
|_| & |_|
|_| |_|
|_| The Tribunal Of Knowledge |_|
|_|_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _|_|
|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|
Well some of you may recall my file on Digital Multiplexing in Phrack 10.
Well this is part 2 that was promised about a year and a half ago. I was
finished with this file in May of 87 and I just decided to release it now.
Here it is!
DMS switches were first introduced in 1979, since then it has been modified
to interface numerous types of switches. DMS has the ability to interface
with SP-1, #5 XBar, 1ESS, 2ESS, 3ESS, 4ESS, NX1D, NX1E, TSD, SXS, ETS4, NO. 1
EAC, NO. 2 EAX, NO. 3 EAX, TSPS, CAMA/3CL boards, Stromberg Carlson Turret of
ONI and Visual Indicators, Modified North Electric TSD for ONI, Stomberg
Carlson (CAMA operator Position - ONI/ANI), AE #31 Switchboard, Co-located
NT/AE switchboard I/C, O/G, UDC data poller of OM, DACS (Directory Assistance
Charging System), NT #144 LTD, WECO #14 LTD, WECO #16 LTD, CALRS (Centralized
Automated Loop Reporting System), Badger 612A, AE #1 and #21 LTD, AE #30, SC
#14 LTD, Lordel MITS70 line Test System, Porta System Line Test Unit, Pulsar
II IMTS, Teradyne loop test unit, and the WECO MLT 1 (Mechanized Loop Testing
System).
Common Channel Interoffice Signaling
Common Channel Interoffice Signaling (CCIS) is a way of signaling and a way
of implementing network level services. CCIS provides reliable, crystal clear
data signaling links between the network and the switching offices. The CCIS
signaling method uses transmission equipment that is separate from voice
trunks.
Common Channel Interoffice Signaling No. 6
The basis for the CCIS system is the International Consultative Committee on
Telephone and Telegraph (CCITT) No. 6 international standard, which is brought
to it's fullest capacity for use in the Stored Program Control (SPC) network
of AT&T.
The CCIS6 network contains a bunch of signaling regions, each having a pair
of interconnected Signal Transfer Points (STP). The switching systems put
into CCIS6 then connecting to STPs are called Serving Offices (SO).
Band Signaling (CCIS-BS) is used on trunk signaling for intertoll-type
trunks using the CCIS network.
Direct Signaling (CCIS-DS) is used for signaling between SPC switching
machines and a Network Control Point (NCP). At the present time CCIS6 can
handle Enhanced INWATS Originating Screening Office (OSO), Calling Card
Validation (CCV), Mechanized Calling Card Service (MCCS), and Billed Number
Screening (BNS). CCIS6 is available with DMS-100/200, DMS-200, and
DMS-100/200 or DMS-200 with TOPS.
CCIS6 Diagram:
NSB ST
------------ - - - - - - - - - - -
DTC | | | ------- |
- - - DS30 | IPML | DS30 | - - - | || | |
--------| |------|- - - - - - |------|-| |---| || | |
Digital - - - | | | - - - | || | |
Trunks | | | | || | |
| | | ------- |
| | - - - - - - -|- - - -
DTC | | TM |
DIG - - - DS30 | NUC | DS30 - - - -----
--------| |------|- - - - - - |--------| |----| |
^ - - - |Network | - - - -----
CCIS \ ------------ Modem
Signaling \ |
- - - -----
AN Links--| | | CCC |
- - - -----
Channel
Bank
Acronyms:
DIG - Digital
AN - Analog
DTC - Digital Trunk Controller
MSB - Message Switch Buffer
ST - Signaling Terminal
TM - Trunk Module
NUC - Nailed-Up Connection