Integrated multi-rate cross-connect system

• US 5,436,890 A
• Filed: 12/30/1993
• Issued: 07/25/1995
• Est. Priority Date: 12/30/1993
• Status: Expired due to Fees

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: DSC Communications Corp. (Nokia Corporation)
• Inventors: Schroder, Richard, Sensel, Steven D., Weldon, Richard S., Deschaine, Stephen A., Doss, Dwight W., Hanson, Gary D., Traupman, Edward P., Read, E. Lawrence
• Primary Examiner(s): Kizou, Hassan
• Application Number:
  US08/176,548
• Time in Patent Office: 572 Days
• Field of Search: 370/16, 370/55, 370/58.1, 370/58.2, 370/58.3, 370/60.1, 370/84, 370/85.13, 370/94.2, 370/100.1, 379/93, 379/94, 359/117, 359/128, 359/139, 359/147, 359/109, 359/115, 359/135
• US Class Current: 370/352
• CPC Class Codes: H04J 2203/0003 Switching fabrics, e.g. transport network, control network
• CPC Class Codes: H04J 2203/0012 Switching modules and their interconnections
• CPC Class Codes: H04J 2203/0041 Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
• CPC Class Codes: H04J 2203/006 Fault tolerance and recovery
• CPC Class Codes: H04J 2203/0089 Multiplexing, e.g. coding, scrambling, SONET
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation
• CPC Class Codes: H04J 3/1611 Synchronous digital hierarchy [SDH] or SONET H04J3/1664 takes precedence for interactions with OTN
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections
• CPC Class Codes: H04Q 2213/1301 Optical transmission, optical switches
• CPC Class Codes: H04Q 2213/1302 Relay switches
• CPC Class Codes: H04Q 2213/1304 Coordinate switches, crossbar, 4/2 with relays, coupling field
• CPC Class Codes: H04Q 2213/13208 Inverse multiplexing, channel bonding, e.g. TSSI aspects
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13332 Broadband, CATV, dynamic bandwidth allocation
• CPC Class Codes: H04Q 2213/1336 Synchronisation
• CPC Class Codes: H04Q 2213/13367 Hierarchical multiplexing, add-drop multiplexing

Abstract

An integrated multi-rate cross-connect system (10) includes a broadband subsystem (14) for processing optical and electrical telecommunication network signals. A wideband subsystem (16) processes wideband level electrical telecommunication signals from the network, from the broadband subsystem (14), and from a narrowband subsystem (18). The narrowband subsystem (18) processes narrowband level electrical telecommunication signals from the network and the wideband subsystem (16). An administration subsystem (12) provides centralized control and synchronization to the broadband subsystem (14), the wideband subsystem (16), and the narrowband subsystem (18). The wideband subsystem (16) is coupled to the broadband subsystem (14) and the narrowband subsystem (18) by internal transmission links (30) to allow for remote distribution of each subsystem. Each subsystem operates within its own timing island synchronized to a reference timing signal to facilitate component distribution.

Claims

1. An integrated multi-rate cross-connect system in a telecommunication network, comprising:

a broadband subsystem for processing and cross-connecting broadband frequency level optical and electrical telecommunication network signals;

a wideband subsystem for processing and cross-connecting wideband frequency level electrical telecommunication signals from a network interface and directly from said broadband subsystem without passing through a network interface;

a narrowband subsystem for processing and cross-connecting narrowband frequency level electrical telecommunication signals from a network interface and directly from said wideband subsystem without using a network interface, said wideband subsystem operable to process electrical telecommunication signals from said narrowband subsystem;

an administration subsystem for providing centralized control and synchronization to said broadband, wideband, and narrowband subsystems.

2. The integrated multi-rate cross-connect system of claim 1, further comprising:

internal transmission links coupling said broadband subsystem with said wideband subsystem and said wideband subsystem with said narrowband subsystem to allow for remote geographic distribution of said broadband, wideband, and narrowband subsystems.

3. The integrated multi-rate cross connect system of claim 2, wherein said internal transmission links carry optical signals in an internal format common to each subsystem.

4. The integrated multi-rate cross-connect system of claim 1, wherein said broadband, wideband, and narrowband subsystems are organized into separate timing islands synchronized by said administration subsystem to facilitate remote distribution and integration of said broadband, wideband, and narrowband subsystems.

5. The integrated multi-rate cross-connect system of claim 4, wherein said wideband subsystem includes tributary signal processing units to interface said wideband subsystem to said broadband and narrowband subsystems for transmission of signals and conversion between said timing islands.

6. The integrated multi-rate cross-connect system of claim 5, wherein said tributary signal processing units process higher rate signals to lower rate signals and lower rate signals to higher rate signals and provide gateway functions and mapping between asynchronous and synchronous signal types.

7. The integrated multi-rate cross-connect system of claim 1, wherein said administration subsystem includes:

an administration unit for generating control information to each subsystem; and

a timing/communication controller unit for distributing timing information to each subsystem.

8. The integrated multi-rate cross-connect system of claim 7, wherein said timing/communication controller unit includes unit managers for receiving control information from said administration unit and distributing said control information to components in each subsystem.

9. The integrated multi-rate cross-connect system of claim 8, wherein said broadband, wideband, and narrowband subsystems include a plurality of unit controllers for receiving and processing said control information distributed by said unit managers.

10. The integrated multi-rate cross-connect system of claim 7, wherein said timing/communication controller unit synchronizes said subsystems from an office timing source or in response to signals received from the network.

11. The integrated multi-rate cross-connect system of claim 7, wherein said administration unit includes a processor for interfacing with a central office and an operator in order to generate said control information.

12. The integrated multi-rate cross-connect system of claim 1, wherein said broadband subsystem includes:

a high speed optical unit for processing synchronous optical signals;

a high speed electrical unit for processing synchronous and asynchronous electrical signals; and

a broadband matrix unit for cross-connecting said optical and electrical signals, said broadband matrix unit coupled to said high speed optical unit and said high speed electrical unit by internal transmission links carrying optical signals in an internal format.

13. The integrated multi-rate cross-connect system of claim 1, wherein said narrowband subsystem includes:

a subrate interface unit for processing network signals;

a narrowband interface unit for processing internal signals from and to said wideband subsystem; and

a narrowband matrix unit for cross-connecting said network and internal signals, said narrowband interface unit coupled to said wideband subsystem by an internal transmission link carrying optical signals in an internal format.

14. The integrated multi-rate cross-connect system of claim 1, wherein said wideband subsystem includes:

a low speed electrical unit for processing network signals;

a plurality of tributary signal processing units for processing signal information communicated to and from said broadband subsystem, said narrowband subsystem, and said low speed electrical unit; and

a wideband matrix center stage for cross-connecting said signal information, said plurality of tributary signal processing units communicating with said broadband subsystem, said narrowband subsystem, and said low speed electrical unit over internal transmission links carrying optical signals in a first internal format, said plurality of tributary signal processing units communicating with said wideband matrix center stage through signals in a second internal format.

15. An integrated multi-rate cross-connect system in a telecommunication network, comprising:

a broadband subsystem for terminating broadband frequency level optical and electrical telecommunication network signals, said broadband subsystem includes a high speed optical unit for processing synchronous optical signals, a high speed electrical unit for processing synchronous and asynchronous electrical signals, and a broadband matrix unit for cross-connecting said optical and electrical signals, said broadband matrix unit coupled to said high speed optical unit and said high speed electrical unit by internal transmission links carrying optical signals in a first internal format;

a wideband subsystem for processing wideband frequency level electrical telecommunication signals from the network and said broadband subsystem, said wideband subsystem includes a low speed electrical unit for processing network signals, a plurality of tributary signal processing units for processing signal information communicated to and from said broadband subsystem, a narrowband subsystem, and said low speed electrical unit, and a wideband matrix center stage for cross-connecting said signal information, said plurality of tributary signal processing units communicating with said broadband subsystem, said narrowband subsystem, and said low speed electrical unit over internal transmission links carrying optical signals in said first internal format, said plurality of tributary signal processing units communicating with said wideband matrix center stage through signals in a second internal format;

said narrowband subsystem for processing narrowband frequency level electrical telecommunication signals from the network and said wideband subsystem, said wideband subsystem operable to process electrical telecommunication signals from said narrowband subsystem, said narrowband subsystem includes a cross-connect interface unit for processing network signals, a narrowband interface unit for processing internal signals from and to said wideband subsystem, and a narrowband matrix unit for cross-connecting said network and internal signals, said narrowband interface unit coupled to said wideband subsystem by an internal transmission link carrying optical signal in said first internal format;

an administration subsystem for providing centralized control and synchronization to said broadband, wideband, and narrowband subsystems, said administration subsystem includes an administration unit for generating control information to each subsystem and a timing/communication controller for distributing timing information and to each subsystem.

16. The integrated multi-rate cross-connect system of claim 15, wherein said administration subsystem provides test capabilities for all signals cross-connected in each subsystem for direct access to narrowband, wideband, and broadband signals.

17. The integrated multi-rate cross-connect system of claim 15, further comprising redundant signal paths and protection schemes throughout each subsystem to increase reliability and improve operation.

18. The integrated multi-rate cross-connect system of claim 15, wherein each subsystem operates on a specific time base within a separate timing island to facilitate remote distribution and integration of each subsystem.