CARIN-LX1 is a digital switching system based on SPC (Stored Program Control) and PCM/TDM techniques, capturing full capabilities of microprocessor power and specially designed to be in accordance with ISDN technology.

CARIN-LX1 demonstrates a wide range of network applications including PABX, rural, local and local/tandem exchanges. Flexibility and ease of expansion are two major factors that prove CARIN-LX1 to be the appropriate solution for telecom network planning along with the most convenient approach to upgrade the system from an initial capacity of 200 ports to a maximum of 53760 ports.

This results in an almost linear relation between the switching capacity and system cost, leaving the telecom planners free of future problems regarding system replacement instead of expanding it.

CARIN-LX1 is designed and manufactured in a full modular structure in all echanical, electrical power, electronic hardware and system software aspects. This provides the user with the most effective approach for system configuration and expansion. This modularity leads the expansion process to consist of adding the new units only, requiring the least modifications in existing units and involving no structural modifications.

CARIN-LX1 uses a distributed microprocessor network to process the system data and to control all system elements and data communications throughout the system. These microprocessors include 16 and 8-bit processors in local units and 32 and 16-bit processors in global switching and control modules.

Each CARIN-LX1 cabinet is capable of providing up to 840 ports, which may be a combination of ordinary DP (Dial Pulse) or DTMF (Dual-Tone Multi-Frequency) analog subscribers, digital feature phones (key-phones), attendant consoles, coin-box sets, lines to other PBX systems, paging and ACR devices, modems or fax machines, analog trunks (C.O., E&M, DID/DOD, R/D,) or CEPT-E1 digital trunks. In maximum configuration, a CARIN-LX1 consists of sixty-four cabinets resulting in a maximum capacity of 53760 ports. Such a system may contain up to 19200 trunks, 15360 of which may be digital trunks.

CARIN-LX1 offers a variety of line and trunk interfaces to ensure full coverage of all types of subscribers and trunks operating in a present network. A few of the subscriber line interfaces include DP/DTMF standard telephone sets, Coin-Box sets, Attendant consoles, Fax machines, standard Modems, ACR & paging devices, digital feature-phones (key phones) and ISDN-phones.

CARIN-LX1 trunk interfaces include all necessary hardware to connect to C.O., E&M,R/D, Loop Dial DID/DOD analog trunks, and CEPT-E1 2Mb/s digital trunks. On each physical interface, various signaling protocols from E&M up to CCS7 are supported to ensure enough flexibility to establish a successful interface. Other PCI products such as built-in PCM4 and PCM30 pair gains or CARIN-HDSL modems may also be combined with a basic CARIN-LX1 exchange to achieve more power and flexibility in subscriber/trunk support and in O&M efficiency.

CARIN-LX1 provides subscribers with a full range of features and facilities in order let them use system resources and capabilities in the most effective way. sophisticated list of advanced and yet easy to use subscriber features turns out CARIN-LX1 to be the best choice for PABX/Rural/Local switching system solutions.

CARIN-LX1 is equipped with a series of O&M equipment to help the O&M staff carry out the system operation and maintenance jobs in the most efficient way.

CARIN-LX1 charging system is a reliable, powerful and flexible charging & billing mechanism including all requirements for an entire charging process, from the storing of input charging records to printing subscriber tickets. This charging system is so flexible that may be configured to match with switching systems ranging from a small PABX working in a hotel, up to a full local/tandem exchange installed in an urban network of exchanges.

The charging system on CARIN-LX1 consists of two basic parts. The first one, which is built inside the exchange, consists of the main call charging generation system and a charging backup storage (dedicated HDD). The second part consists of a personal computer running an SMDA (Subscribers Message Detailed Accounting) software which is connected to the exchange via a standard RS-232 serial line. This PC is capable of receiving, storing and managing all charging records received from the system, and generating various charging reports based upon the information saved on its hard disk.

The entire charging system may be configured to operate upon both LAMA and CAMA (Localized and Centralized Automatic Message Accounting) charging methods.

To achieve the highest grade of operation reliability and resource availability, all important elements of a CARIN-LX1 system such as the PCM SN (Switching Network), local and global processors, DC power supplies and Ring signal generators operate with a 1+1 redundancy and in a hot-standby manner.In case of a faulty condition, the standby module automatically replaces the failed module without any system or call interrupts.

For maximum availability, the switching networks used in CARIN-LX1 are arranged to be non-blocking. Inter-Unit connections involve a negligible blocking factor (10E-5).


» General Specifications

• Full conformity with ITU-T technical recommendations.
• Using TDM/PCM techniques.
Distributed control based on SPC (Stored Program Control) techniques using 32, 16 and 8-bit microprocessors.
• Modularity in hardware and software design.
• Automatic hardware/software self-diagnosis.
• Universal slots for analog/digital line/trunk interfaces.
• Easy system support due to low variety in system cards.
• Signaling flexibility and network adaptation.
• Layered control of communication between global and local control units.
• Non-blocking, modular, full available global and local switching networks.
• 1+1 redundancy and hot-standby operation in all major modules such as local and global switching networks, local and global processors, DC power and ring generators, providing safe and non-interrupted faulty module replacements.
• Easy installation in rooms or standard containers.
• Low power consumption.
• Easy expansion from 200 to 53760 ports.
• Up to 20,000 BHCA in a local unit and 250,000 BHCA in the global unit.
• Configurable to operate as rural, local, tandem exchange, PABX and remote switch unit.
• Layered inter-cabinet communications via 64Kb/s channels.
• Remote cabinet support via 2Mb/s CEPT-E1 G.703 links.
• Remote connection of accessories (O&M, Billing, Attendants, MAP) via 2Mb/s CEPT-E1 G.703 links providing system management and supervision from a centralized O&M site.
• Several storage media, to save system database, charging records and other dynamic data, including SRAM, DRAM, EPROM, FDD, and HDD.
• Extensive set of subscriber features and facilities to optimize use of system/network resources.
• Malicious call tracing service on local or trunk calls.
• Traffic measurements and detailed traffic reports.
• Prerecorded announcements depending on port status. (e.g. Invalid dialing, Calling or Called party blocked)
• Equipped with optional CARIN-PA1 PCM-Analyzer to analyze, test and perform all necessary measurements on PCM-E1 links, with capability to transfer analysis results to a PC.
• Equipped with optional CARIN-LT1 Automatic Line Tester to analyze, test and perform all necessary measurements on subscriber lines (both exchange and cable network sides).
• Equipped with optional E&M Analog Trunk Tester to analyze, test and perform all necessary measurements on E&M analog trunks.
• CCS-No.7 signaling according to ITU-T recommendations Q.702, Q.721-724, Q.761-764 and Q.703.
• ISDN U-interface subscribers according to ITU-T I.431, Q.921, Q.931
• Multi-stage protection in MDF and subscriber PBA’s using gas-tubes, PTCs, Varistors and fail safe mechanisms in order to protect hardware against over voltage, over current, sparks and instantaneous electric shocks.
• Built-in 64Kb/s PCM4/PCM30 pair gain interfaces.