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DTIS in depth (Mostly General RP) (WIP)
The DTIS (acronym for the Digital Telephone Interface System/Suite) is a suite/sets of telecommunication protocol, developed in 80s in former Ikheria SFSR, former Soviet Union, and widely known as de facto successor of ISDN (Integrated Services Digital Network). DTIS refining and upgrading many of ISDN technologies, making DTIS considered as Ethernet for phones and hitting telco market with some Western European and Asian telecom companies interested and requesting access to this novel technology, and in 1989, in the Soviet Union, the Central Committee of Communist Party of Ikheria (Ikherian branch of Communist Party of Soviet Union) are awarding 50 developers and scientist with Order of the Red Banner of Labor, on behalf of General Secretary of Communist Party of Soviet Union for their invention and successful pilot deployment in Leningrad, Minsk, Moscow, and Warsaw (now Yeltsingrad). The employer of the inventors, RELCOM Ikheria/SovIkherTel are also awarded. Major deployment began in Ikheria, Russia, Ukraine, and East Germany, followed with remaining Soviet republics and some Western nations and in June 1996, by majority, ITU officially recognizing the standard and is displacing ATM, Frame Relay, ISDN, SMDS, and X.25 services.DTIS inherited many ISDN capabilities (Caller/Called Line Identification, Multiple Subscriber Number, High-speed data communication, etc) and some new capabilities (SMS/MMS/Rich Messaging-like text messaging system, more faster connection set-up time, improved security and privacy (using DES and AES), ONAD (One Number, All Device (aka number sharing)), number portability and etc). DTIS also capable to be transporter and be transported for/by xDSL, Ethernet, MPLS, IPv4/IPv6, TCP/UDP, and others.
DTIS standard define interface reference area into 3 area:
NNI (Network to Network Interface)
This interface area defined as interconnection interface between DTIS exchange/PBX system. This area are under provider/administrator control.
UNI (User to Network Interface, from subscriber view) or NUI (Network to User Interface, from DTIS exchange/PBX view)
This interface area, also known as "The middle area", defined as interconnection interface, bridging NNI and UUI area. The area started from Subscriber Connection Module (in DTIS exchange) to master device with Terminal Register and Controller (like PBX systems, digital telephones, etc), with DNTC (DTIS Network Termination Controller, also known as DTIS iNID (Intelligent Network Interface Device) unit) in subscriber premises acting as the demarcation point and provide local network control, service management, and as testing system for network and user side. This interface area fall under joint subscriber/provider control.
UUI (User to User Interface)
UUI are defined as an interconnection interface between all DTIS terminal device whom connected into master device/DNTC, directly and indirectly in that subscriber premise.
The standard define types of DTIS virtual circuits:
SVC (Switched Virtual Circuit)
A switched virtual circuit (SVC) is dynamically established virtual circuit, created on demand and is torn down when transmission is complete. SVC connections are established using signaling protocol part of DTIS.
PVC (Permanent Virtual Circuit)
A permanent virtual circuit (PVC) is a manually configured, permanently established static virtual circuit. PVC connection allow virtual leased-line service. This connection method are used for always-on internet services or branch connection to head office.
Soft PVC
A Soft PVC is a PVC that is established manually across UNI and dynamically across NNI. UNI part of Soft PVC are PVC and NNI part of Soft PVC are SVC. This connection type was compromise of PVC and SVC advantages.
Like ISDN, there also type of service available:
MSAI (Minimum Service Access Interface)
MSAI (Minimum Service Access Interface) is consisting from 2-4 B0-B3 (Bearer) channel and 1 SD0-SD2 (Signaling/Data) channel.
BSAI (Basic Service Access Interface)
BSAI (Basic Service Access Interface) is consisting from 2-8 B0-B5 (Bearer) channel and 1-2 SD0-SD3 (Signaling/Data) channel.
ESAI (Enhanced Service Access Interface)
ESAI (Enhanced Service Access Interface) is consisting from 4-16 B3-B6 (Bearer) channel and 1-4 SD0-SD3 (Signaling/Data) channel.
SSAI (Secondary Service Access Interface)
SSAI (Secondary Service Access Interface) is consisting from 4-24 B4-B7 (Bearer) channel and 1-4 SD0-SD4 (Signaling/Data) channel.
PSAI (Primary Service Access Interface)
PSAI (Primary Service Access Interface) is consisting from 4-32 B4-B11 (Bearer) channel and 2-6 SD0-SD5 (Signaling/Data) channel.
