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SPAS-2000 Programmable Switch

　Currently, telecom companies are advancing at unprecedented pace. User groups that are rapidly developing, diversified business and operational environments require telecom companies to offer services that are of higher and better quality. Thus, these companies are facing all-round competitions from home and abroad. How to initiate new operation style, lower operational cost, develop new businesses and open new revenue streams are crucial challenges that telecom companies are confronting.
　SPAS programmable Switch can provide many kinds of access services, including No.7, No.1, V5, PRA, ASL, and flexible conversion among them. It is an access service platform that is open, advanced, flexible, efficient, and easily extendable. It has two interfaces: E1 and T1. The system exhibits strong technical superiorities in the above-mentioned aspects. It is an advanced programmable switch platform with whole owned intellectual property and high performance-to-price ratio in the local market.

Introduction to the System Hardware Architecture
　SPAS-2000 platform is composed of SPAS-2000 DTS and SPAS-2000 SAS. SPAS-2000 DTS is a programmable Switch dealing with the access of signaling, while SPAS-2000 SAS is the user access module, mainly dealing with the access of user interface such as ASL user, DDN, and FXO/FXS.
1 Features
1)SPAS-2000 is a product developed with industrial PC based on ISA and PCI bus. It adopts modular design to ensure the extensibility and integration of the system. A single module can realize 2KX2K non-blocking exchange.

2)Versatile hardware interfaces. SPAS-DTS has SS7, DT, VOC, and MFU; SPAS-SAS provides many kinds of user interface boards
3)Backup power system makes the system highly reliable
4)One 10/100 Base-T Ethernet interface on the MPU board provides communications with administrator, CTI, and other SPAS modules.
5)Hierarchical control and clustering technology adopted to increase the handling capacity and reliability of the system.
6)Standard rack structure, all functional boards can be installed on racks.

2 Introduction of SPAS-2000 SAS (user access modules)
　SAS provides the access of 4 E1 i.e. 120 channels. Signaling can be transmitted via the E1 connection between the trunk and the DTU board of SPAS-2000 DTS through the ABCD code/CAS. Following interfaces are supported,
> Analog user board (ASL): one board for eight user channels
> DDN board, support the transmission rate of Nx64K
> FXO/FXS: eight channels on each board, with support for polarity reversal detection.
> E/M user board: 8 channels on each board

3 Introduction of the SPAS-2000 DTS(Digital Trunk Access)
1) No.7 Signaling Board (SS7): one single module of SPAS system can be installed with two SS7 boards, providing connections for 4 signaling links. SS7 board has the following features:
> Realizing the data link layer function of No.7 signaling (MTP L2), which is normally accomplished by the SS7 signaling handling chip and the CPU on the single board
> There are two signaling links on SS7 signaling board. Designing of the board is based on the ISA/PCI bus. Via the mini switch net, any two 64kb/s time slots among the one time group of PCM transmission system (2Mb/s) may be selected as the duplex data channels of signaling transmission
> Four-way connection verification circuits are also designed on SS7 board to meet the requirement of the TUP layer of CCITT No.7
2) Trunk Board(DTU): 7 DTU boards can be inserted into one SPAS module; DTU board has the following features:
> There are 8 E1 on DTU board. They are highly integrated for maximal flexibility: each E1 can be configured as PRA, R2MF, TUP, ISUP, ASL and V5X as required
> Eight HDLC are designed to match 8 E1 on DT board to provide flexible signaling configuration
> Interface board supports E1 and T1
3) Multi-functional Signal Tone Unit (MFU) : MFU can be inserted into the general slot of DTU, or slot 14 or 15. When inserted into the general slot, 256 channels can be handled, whereas when inserted into slot 14 or 15, 192 channels can be handled. It has the following functions:
> MFC forward reception/ MFC backward reception
> DTMF reception: multiple kinds of signal tones transmission(up to 60 types including MFC forward/backward transmission), and special signal tones (fax tone, busy tone, etc.) detection
> FSK reception & transmission
> Voice code U LAW/A LAW conversion: each board can convert between U LAW and A LAW of 128 channels
> Flexible configuration, 4 DSP boards with 64 channels each, can be configured independently
4) Voice Board:
> Provide 100M Ethernet interface
> Support 240-channel voice recording/playing
> Embedded Flash can store 30-minute voice recording
> Include 8-channel fax
> With DTMF detection
> Support IP (H.323) protocol

Features of SPAS-2000 System
1 Modular architecture: The design of SPAS programmable Switch is based on open standards and modular architecture;

2 Multi-signaling access: The system supports the common signaling access in the local market. The flexible routing configuration modes facilitates different kinds of routings such as lowest cost routing and routing upon different services requirements;

3 Versatile hardware resources: SPAS-2000 platform provides versatile hardware interface resources, including resources such as voice, fax, IP, conference, DTME/MFC reception/transmission, standard E1/T1 interfaces, user interface (ASL, DDN, FXO/FXS). With the combinations of these resources, the platform can be used for many different services;
4 Open interfaces: Standard external TSPI interface is provided. Users can do value-added development with the utilization of standard TAPI. They are also able to connect with third party IVR flow generator;
5 Large capacity: The configuration of a single module can consist of 56 E1, 2K X 2K exchange network, which, can be scaled to 240 E1, 8K X 8K exchange network by cascading. This will adequately satisfy the needs of applications relevant to signaling conversion, call center and unifying information;
6 Powerful network administration functions:
SPAS programmable Switch provides powerful network administration entirely based on graphical user interface design, including:
> Data configuration: configurations of card resources, office routing, No.7, V5, etc. and those online modifications; after new data is configured, upload or download in the same condition will not affect the running of other resources and no need to restart the system .
> Track, monitor, and maintain: tracking classified signaling, monitoring the channel status, and maintaining the signaling links and channel status.
> Signaling analysis: signaling explanation on the information tracked and collected
> Flexible number editing: Adding or deleting prefix of the callee number.Users can modify the caller number specified.
> Calling statistics. Call statistics accurately reflect the call flow in the period.
> Detailed alarm message: intuitive alarm platform, complete display, recording of all the alarm incidents during the running of the switch.
> Strict administrator authentication: delegated administrations and flexible authority settings ensure the safe running of the switch.
> All the functions configured will take effect immediately without terminating the server or restarting the switch.
> Remote control: on-line modification of the IP address of the switch, on-line version upgrade of the edition, flexible watch dog startup, safe and stable running of the program.
7 Powerful processing capability: BHCA of the single No.7 link is 44900 times/hr, and that of a double link is 73000 times/hr. The overall processing capacity of the system is 130 000 times/hr;
8 Highly reliable: call loss is less than 1/105 in callings exceeding ten millions times;
9 Successfully passed the test conducted by the Ministry of Information Industry and has been awarded the access license;
10 High performance to price ratio: The highly integrated design of SPAS-2000 lowers the construction costs and increases the profit margin at the same time.