SSCOP/SSCF
High-Speed Benefits
The SSCOP/SSCF module creates high-speed links for SS7 when it is used with the Adax ATM-PCI and cPCI boards. It does this by supporting SS7 signaling over ATM at T1/E1, T3/E3, and OC3/STM-1 data rates, providing a highly reliable transmission service to the signaling layer above it. MTP-2 is only defined for or 64kbps signaling links. A new definition, called Signaling ATM Adaptation Layer (SAAL), defines the new high-speed link. Data transmission speeds are increased to T1 and E1 rates and a simple migration path is offered to broadband networks for SS7 applications.
The future for Intelligent Networks is ATM. As most telcos face increased signaling demand all that is required is the substitution of the ATM board and SSCOP/SSCF software for the existing Adax MTP-2 board and software. SSCOP delivers optimum utilization of high-bandwidth data links and is backward compatible with legacy MTP-3 software running over the Adax SS7 board and driver. Configuration flexibility is also possible because High-Speed Links (T1/E1, T3/E3, OC3/STM-1) and standard 56/64 Kbps links may be mixed in a single system.
Performance is in the Details
SSCOP/SSCF provides complete level 2 data communication control for ATM-based SS7 conforming to the ITU and ANSI broadband SS7 standards. This includes signal unit formatting into ATM cells (AAL5), enhanced and efficient error recovery as provided by SSCOP, selective re-transmission of rejected Protocol Data Units, error monitoring, sequence number control (uses very large sequence numbers), link status control, and monitoring of the underlying ATM link. SSCOP/SSCF can utilize ATM AAL5 or HDLC as a transport.
The SSCOP module is implemented using SSCOP over the Common Part Convergence Sublayer and Segmentation and Reassembly Sublayers of ATM Adaptation Layer Type 5 (AAL5). Network Node Interface (NNI) connectivity is made possible by using SSCF (Service Specific Co-ordination Function) over SSCOP. This provides faster service and extends the features available to higher protocol layers.
SSCOP and SSCF are independent parts of the Signaling ATM Adaptation Layer (SAAL). Together they form the equivalent of the MTP-2 Layer protocol in an ATM environment. SSCOP supports the User Network Interface (Q.2130) and SSCF is a Convergence Sublayer that connects MTP-2 and MTP-3 by supporting the Network to Network Interface (Q.2140). For users and developers, this means that the MTP-3 Interface, the management and control functions, and the Intelligent Network applications all conform to industry standards.
SSCOP/SSCF is designed to be modular. This means that you can build a server from a single card up to a multiport rack for the most demanding telecommunications applications running combinations of Frame Relay, X.25, SS7/MTP-2, and SS7/ATM simultaneously.
DLPI Support
SSCOP/SSCF is a standard UNIX streams module with an upper AT&T DLPI interface specification for upper layer drivers. This architecture provides for easy migration of MTP-3 and SSCOP/SSCF from MTP-2.
Operating System Support and Adax Protocol Controllers
Operating on all major bus architectures, the APS-SSCOP/SSCF driver supports popular UNIX operating systems.
The Adax implementation of ATM SS7 is supported on the PCI and cPCI bus, with the ATM-PCI and ATM-cPCI products. On the ATM board, Adax provides support for the network interface with a daughter card that has built-in T1 or E1 or OC3/STM-1 connections and the CSU/DSU function. The ANC-QCX (4 x T1/E1), ANC-TCX (2 x T1/E1) and ANC-OC3 (2 x OC3/STM-1) provides a direct connection from the server to the network without any external devices or routers.
Adax Software
Adax Protocol Software (APS) is a suite of products designed to get the most out of each Adax hardware product and is supplied with a set of common APIs enabling simple integration of the upper layers. Adax HDLC, SS7, X.25, Frame Relay, LAPB, LAPD and LAPV5 provide a well-balanced, high performance, low overhead direct connection to the network.
Fastest Time to Market
Adax provides extremely fast time to market through simplicity of design and a modular product range. This common software interface ensures a simple migration path and provides a flexible and portable solution. The API's between products remain the same preserving the investment in the higher layer software and applications. This compatibility enables quick upgrades to next generation requirements and easy field upgrades to expand the capabilities of installed systems.
Adax, Inc., 614 Bancroft Way, Berkeley, CA 94710. Tel: 510-548-7047; Fax: 510-548-5526.