SE514985C2 - Access module for multi-media terminals with high signal processing capacity - Google Patents

Abstract

The core part incorporates ATM inputs with 2.5 Gbit/s, a component processor board for control, monitoring and transformation of information arriving on the inputs in an outgoing cell flow and a signal channel for sending control and choice information upwards in the network. The access part contains individual line circuit boards which offer inputs with 34 Mbit/s. The access module has a part with 16 line circuit boards each with 16 inputs with 34 Mbit/s and the core part has four input boards each with an input with 2.5 Gbit/s, a bus board, a processor and clock board and a signalling interface board. Alternatively the 16 line circuit boards can each have four inputs with 155 Mbit/s. The line circuit boards and the input boards are interchangeable.

Description

40 30 35 40 514 985 2 preferably contains individual line circuit boards.

The invention is set forth in more detail in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 is a block diagram of a network architecture utilizing the invention and Figure 2 is a block diagram of an access module in accordance with the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Future telecommunications systems will need new equipment in the access plane to be able to satisfy users' wishes to e.g. in the home be able to connect i.a. multimedia terminals. Inputs with 34 Mbit / s and 155 Mbit / s respectively will be needed. In order to be able to optimize broadband and high-speed signaling in the local networks, suitable entrances and exits must be created along the so-called electronic highways. The present invention seeks to solve the technical problem of providing a device which enables a rational broadband termination at access points in the telecommunications system and which allows the utilization of e.g. multimedia terminals in the local network.

Figure 1 shows a network architecture utilizing access modules AM in accordance with the present invention. The access modules AM form an interface with the terminal and transfer plan. For example, the access module works as an interface to a local LTE transfer gearbox with an ATM-based bandwidth-independent switch. These LTE switches are controlled by a local service control node LSN which contains all the traditional local switching functionality but without any switching hardware except for a powerful processor system. Via a transit transfer exchange TTE with a large ATM-based bandwidth-independent switch with conversion transfer functionality GTE (Gateway Transfer Exchange) to other operators, connections are formed with other operators. ITE denotes an international transfer exchange with a large ATM-based bandwidth-independent switch. SCP denotes a service checkpoint that can be located at different levels in the network for many 10 15 20 25 30 35 40 514 985 3 number translation services. SDP is a service data point that can be located at different levels in the network. SN denotes service nodes that can be located at different levels in the network.

Functions such as voice mailboxes and interactive voice answering equipment are linked to the transfer network.

The access module can also form an interface to base stations BS and mobile telephone exchanges BTS. RSM and RSS denote Remote Switch Multiplexers and Remote Switching Systems, respectively.

ESM is an Extended Switch Module while LSM is a Line Switch Module.

I-MUX denotes an ISDN multiplexer for 14 subscribers with 2B + D.

The figure shows that the new access modules meet the requirement for connection of multimedia terminals at 155 Mbit / s and 34 Mbit / s for home terminals. Unlike today's access products, the access modules according to the invention do not contain any selector functionality, but the selector functionality has been concentrated on the transfer plane. The access modules provide suitable entrances and exits to the "electronic motorways". Two types of bandwidth are offered, 34 Mbit / s for households and 155 Mbit / s for companies and more advanced users.

However, the access modules according to the invention are based on a common basic principle that leads to good finances and low investment, operating and maintenance costs. The modules are structured in a core part that is common to all modules and an individual part that depends on the type of terminal and access line that is relevant.

Figure 2 schematically shows the access module according to the invention. It thus consists of two parts, a core part which provides the outputs to the network and an access part which provides the inputs for terminals.

The access module consists of a magazine that contains a core part consisting of: four 2.5 Gbit / s ATM outputs on the network side; a common bus that arranges the cell flow over the outputs; an organ processor board with associated programs and data memory function for controlling, monitoring and transforming the information entering the inputs into outgoing cell flow; a clock for controlling the cell flow over the bus 10 15 20 25 30 35 40 51-4 985 4 to the four ports at 2.5 Gbit / s; a protocol manager for arranging the cell flow and introducing empty cells when no information is available to send; and a signal channel for transmitting control and selection information upwards in the network. The protocol can be thought of as some form of further developed V5.x protocol.

The characteristic of the core part is that it is not concentrating.

When all four output ports are connected to the network, each access line is assigned 1 Erl. By only connecting one of four ports, the availability is reduced to 0.25 Erl per line, which is sufficient in most cases. By using the ATM, the cell flow on the bus can handle this amount of traffic from each subscriber even in the mini configuration. The access module acts as a compactor. As traffic increases and cell losses begin to become troublesome, a new gateway with 2.5 Gbit / s is opened.

The advantage of this module is that it is common to all types of access modules. It could, if one so wishes, belong to the transfer plane, but for traditional reasons it has been placed within the framework of the access plane.

The individual access part of the access module consists of its own magazine and contains individual line circuit boards.

The cards consist of two basic types: a card family offers a number of suitably 8 or 16 inputs at 34 Mbit / s depending on available ASIC technology. The inputs are differently structured depending on the type of access. There are cards to terminate e.g. ADSL, HDSL, FR, SMDS, circuit emulation 64 Kbit / s, ISDN (2B + D, 3OB + D), 2 Mbit / S PCM etc. one card type offers a number, preferably two or four inputs at 155 Mbit / s depending on available ASIC technology. The inputs are used to connect ATM equipment, suitable for connecting the ATM hubs that will be in private networks, or powerful city / local area applications (MAN / LAN) that require large bandwidth or powerful workstations that need up to 155 Mbit / s for e.g. file transfer, advanced multimedia applications, etc.

Incidentally, connections requiring 2.5 Gbit / s are considered very rare today and are therefore connected directly to the ATM nodes in the transfer plane as semi-permanent connections without utilizing the present invention. 10 15 20 25 30 35 40 514 985 5 The network requires two types of access modules: a module for 256 subscribers with inputs of 34 Mbit / s and four network outputs with 2.5 Gbit / s, which in a mini configuration provides 0.25 Erl. and in a maxi configuration l Erl; a module for 64 subscribers with inputs of 155 Mbit / s and four network outputs of 2.5 Gbit / s, which in the mini configuration gives 0.25 Erl and in the max configuration 1 Erl.

The access module is at its core an ATM product and functions as a compactor or multiplexer. Four channels of 155 Mbit / s are used for communication with the local control node LSN over a link of 155 Mbit / S with V5.x.

The first type of access module for 34 Mbit / s consists of two magazines, one for the core part and one for the access part, ie the application part.

The number of line cards in the access section is 16, each with 16 inputs at 34 Mbit / s.

The number of cards in the core magazine is four input cards, each with an input of 2.5 Gbit / s, a bus card, a processor and clock card and a signal interface card for V5.x.

The power supply is individual for each card. The cards are of course self-identifying and card changes can take place without the neighbor card being affected or power having to be broken. The total number of cards is thus 23 and can, as stated above, be advantageously organized in two magazines, ie a core magazine with 7 cards and a line interface application magazine with 16 cards with 16 ports per card, of which 16 ports are used for signaling with the network (LSN ).

The second type of access module with 155 Mbit / s also consists of two magazines, one for the core part and one for the access part.

In the access section, the number of cards is 16 with four inputs of 155 Mbit / s each. The number of cards in the core part is the same as above.

The total number of cards is also 2å here and is arranged in two magazines, ie a core magazine with 7 cards as above and a line interface application magazine with 16 cards each with four ports at 155 Mbit / s, of which four ports are used for signaling with the network ( LSN).

The advantage of this structure in accordance with the present invention is that only individual line interface modules 51% 985 need to be redesigned, which means that the cost is minimized, the construction times are shortened, the maintenance is reduced and so on. However, in order for different suppliers to be able to manufacture line interface modules, it is assumed that the interface between the modules is open and published. A The access module according to the invention replaces the current local station position. Today's RSS links are connected to an access module AM for 34 Mbit / s which has been structured to 16 inputs with 2 Mbit / s. A fully developed RSS / RSM with 2048 subscribers has a maximum of 16 links with 2 Mbit / s. If the number of links is less than 16, the line card input is programmed so that the correct number of links with 2 Mbit / s is always connected. This means that the number of RSS / RSMs that can be connected is 256, which in a mini-configuration means about 32,000 and in a maxi-configuration means about 500,000 subscribers.

By introducing this type of access module in the network, all subscribers can be offered at least 34 Mbit / s at the same price as today. Maintenance costs are reduced by at least half. By preserving the infrastructure in cables and premises, the cost of the future network can be kept to a minimum.

Thus, the present invention solves the problems set forth above. The invention is limited only by the following claims.

Claims (7)

10 15 20 25 30 514 985 Y PATENTKRAV An access module for connecting a terminal to a local network, comprising an open interface core part providing outputs to the local network and a subscriber-specific interface access part providing inputs for each terminal, the core part comprising 2.5 Gbit ATM outputs / S, an organ processor board for controlling, monitoring and transforming information entering the inputs into outgoing cell flow and a signal channel for transmitting control and selection information upwards in the network, characterized in that it consists of two magazines, one for the core part and one for the access part, the access part containing individual line circuit boards and the core part containing individual input cards, which line circuit boards and input cards are individually interchangeable. Access module according to claim 1, characterized in that the line cards offer inputs at 34 Mbit / s. Access module according to claim 2, characterized in that it can connect 256 subscribers. Access module according to claim 1, characterized in that the line cards offer inputs at 155 Mbit / s. Access module according to claim 4, characterized in that it can connect 64 subscribers. Access module according to claim 3, characterized in that the access part has 16 line circuit boards each with 16 inputs at 34 Mbit / s and the core part has four input cards each with an input of 2.5 Gbit / s, a bus card, a processor and clock card and a signaling interface board. Access module according to claim 6, characterized in that the access part has 16 line circuit boards each with four inputs of 155 Mbit / s and the core part has four input cards each with an input of 2.5 Gbit / s, a bus card, a processor and clock card and a 'signaling interface board.