Host digital terminal

• US 20030099245A1
• Filed: 08/08/2002
• Published: 05/29/2003
• Est. Priority Date: 11/29/2001
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yong-Hoe, Jang, Seung-Ki
• Granted Patent: US 7,263,101 B2
• Time in Patent Office: Days
• US Class Current: 370/395.52
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 2012/5605 Fibre
• CPC Class Codes: H04L 2012/561 Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics

Abstract

A host digital terminal HDT is for performing backbone functions to a subscriber access network, while the network side of the HDT is connected to many data transfer networks and the other side of the HDT is connected to many optical network units ONUs. The HDT includes an HDT switching/clock unit HSCU for outputting an asynchronous transfer mode ATM signal, after an asynchronous transfer mode ATM serial signal is converted to an ATM parallel signal, an ATM switching is performed according to transmission information of the ATM parallel signal, and the ATM parallel signal is re-converted to the ATM serial signal, and for outputting a synchronous transfer mode STM signal, after the STM dependent signal is received, and a virtual channel VC cross connection is performed; an ATM network interface unit ANIU, connected to the data transfer network, for receiving a signal transmitted from the data transfer network, extracting an ATM signal form the transmitted signal, performing an inverse-multiplexing and each of ANIU cell processes to the extracted ATM signal, converting the extracted ATM signal to the ATM serial signal, and transmitting the ATM serial signal to the HSCU, sequentially; an HDT network interface unit HNIU, connected to many ONUs, for converting the ATM serial signal transmitted from the HSCU to the ATM parallel signal, performing a multiplexing and each of HDT cell processes to the ATM parallel signal, transmitting the ATM parallel signal to the connected ONUs, sequentially; a HDT main control unit HMCU for performing control management functions for controlling mutual interactions among the units of the HDT and data flows; and a shelf for including a common bus to exchange all of data among the units, where each of the units is plugged in.

Claims

1. A host digital terminal (HDT) for performing backbone functions to a subscriber access network, while the network side of the host digital terminal is connected to a plurality of data transfer networks and the other side of the host digital terminal is connected to a plurality of optical network units (ONUs), said host digital terminal comprising:

a host digital terminal switching/clock unit (HSCU) for outputting an asynchronous transfer mode (ATM) signal, after an asynchronous transfer mode (ATM) serial signal is converted into an ATM parallel signal, an ATM switching is performed according to transmission information of the ATM parallel signal, and the ATM parallel signal is re-converted into the ATM serial signal, and for outputting a synchronous transfer mode (STM) signal, after the STM dependent signal is received, and a virtual channel (VC) cross connection is performed;

an ATM network interface unit (ANIU), connected to the data transfer network, for receiving a signal transmitted from the data transfer network, extracting an ATM signal from the transmitted signal, performing an inverse-multiplexing and each of ANIU cell processes to the extracted ATM signal, converting the extracted ATM signal to the ATM serial signal, and transmitting the ATM serial signal to the HSCU, sequentially;

a host digital terminal network interface unit (HNIU), connected to a plurality of optical network units (ONUs), for converting the ATM serial signal transmitted from the host digital terminal switching/clock unit (HSCU) to the ATM parallel signal, performing a multiplexing and each of host digital terminal cell processes to the ATM parallel signal, transmitting the ATM parallel signal to the connected ONUs, sequentially;

a host digital terminal main control unit (HMCU) for performing control management functions for controlling mutual interactions among the units of the host digital terminal and data flows; and

a shelf comprising a common bus to exchange all of data among the units, each one of the units being plugged in the shelf.

2. The host digital terminal according to claim 1, wherein the ATM network interface unit (ANIU) interfaces with the data transfer network through at least one of E1/T1, DS3, STM-1, STM-4, and STM-16.

3. The host digital terminal according to claim 1, wherein the data transfer network is an ATM network interacted with at least one of a public switched telephone network (PSTN), a voice over internet protocol service network (VoIP), and an Internet protocol service network (IP).

4. The host digital terminal according to claim 1, wherein the HNIU interfaces with a plurality of ONUs through at least one of STM-1, STM-4 sand STM-16.

5. The host digital terminal according to claim 1, wherein a topology connected to the ONU is a star topology.

6. The host digital terminal according to claim 5, wherein the star topology is an ATM passive optical network (PON).

7. The host digital terminal according to claim 1, wherein the shelf comprises 21 slots, while two HMCUs and two HSCUs are installed for duplication functions, and the other units are installed in variable according to the service conditions.

8. The host digital terminal according to claim 1, wherein the common bus comprises:

an operation, administration and maintenance (OAM) data bus for exchanging an OAM data;

a clock bus for transmitting a clock impression signal;

a virtual channel (VC) bus for exchanging a VC signal; and

a synchronous transfer mode STM bus for exchanging an STM signal.

9. The host digital terminal according to claim 8, wherein the HSCU comprises:

a parallel/serial converter (HSCU PSC) for converting the transmitted ATM serial signal to an ATM parallel signal, or vice versa;

an ATM switching unit (HSCU SU), a switching fabric, for switching the ATM signal converted by the HSCU PSC according to the transmission information of the ATM signal, and for transmitting inversely the ATM signal to the HSCU PSC;

a bus interface unit (HSCU BIU) for receiving a STM dependent signal from the VC bus and the STM bus, for performing a bus interface, or vice versa; and

an STM cross connecter (STM CC) for performing a cross connection to the STM dependent signal transmitted from the HSCU BIU among one of the VC-11, VC-12, VC-3 or VC-4 class, and for transmitting inversely the STM signal to the HSCU BIU.

10. The host digital terminal according to claim 1, wherein the ANIU comprises:

an optical transmitter (ANIU OT), comprising a plurality of ports connected to the data transfer network through optical fiber cables, for receiving a signal from the data transfer network to perform an optical/electronic interface, or vice versa;

a user network interface (UNI) for receiving the optical/electronic interfaced signal from the ANIU OT to perform an ATM interface to extract an ATM signal, or vice versa;

a cell processor (ANIU CP) for performing an inverse multiplexing to the extracted ATM signal to do each kind of ATM cell processes, or vice versa; and

a parallel/serial converter (ANIU PSC) for converting the cell processed ATM signal to an ATM serial signal transmittable to the HSCU, or vice versa.

11. The host digital terminal according to claim 1, wherein the HNIU comprises:

a parallel/serial converter (HNIU PSC) for converting the ATM serial signal transmitted from the HSCU to an ATM parallel signal, or vice versa;

a cell processor (HNIU CP) for performing multiplexing and each kind of cell processes to the ATM parallel signal transmitted from the HNIU PSC;

a universal network interface (HNIU UNI) for re-converting the ATM signal from the HNIU CP to a signal transmittable to the data transfer network, or vice versa; and

an optical transmitter (HNIU OT), connected to a plurality of optical network units (ONUs) through optical fiber cables, for performing an optical/electronic interface to the signal from the HNIU UNI to be transmitted to the ONU, or vice versa.

12. The host digital terminal according to claim 1, further comprising a host digital terminal tributary interface unit (HTIU) for performing:

an over head and pointer processes to an STM-1 signal transmitted from the data transfer network, and the STM-1 signal transmission to the common bus, or vice versa; and

a line interface, and an over head and pointer process to a signal, transmitted from said data transfer network, and the signal transmission to the common bus through multiplexing in an administration unit 3 AU3, or vice versa, the line interface being any one of E1, T1, and DS3.

13. The host digital terminal according to claim 12, wherein the host digital terminal tributary interface unit (HTIU) comprises:

an optical transmitter HTIU OT for receiving an STM-1 signal transmitted from the data transfer network to perform optical/electronic interface, or vice versa;

an STM processor for performing an over head and a pointer process to the interfaced signal from the HTIU OT, or vice versa;

an STM mapping unit (STM MAU) for converting the processed signal from the STM processor to an STM-1 signal to be transmitted to the common bus, or vice versa;

a line interface unit (HTIU LIU) for receiving at least one signal among E1, T1, and DS3, or vice versa;

a signal processor HTIU SP for performing an over head and a pointer process to the interfaced signal at HTIU LIU, or vice versa; and

an AU3 multiplexing unit AU3 MPU for multiplexing the processed signal in the signal processor to an AU3 signal to be transmitted to the common bus, or vice versa.

14. The host digital terminal according to claim 1, further comprising:

a hybrid interface unit (HIU), connected to a plurality of ONUs, for transmitting the ATM signal from the HSCU and the STM signal from the common bus to the ONU.

15. The host digital terminal according to claim 1, wherein the hybrid interface unit HIU comprises:

a parallel/serial converter (HIU PSC) for converting the ATM serial signal transmitted from the HSCU to an ATM parallel signal, or vice versa;

a cell processor (HIU CP) for performing a multiplexing and cell processes to the ATM signal converted by the HIU PSC, or vice versa;

a bus interface unit (HIU BIU) for performing a bus interface to an STM signal transmitted from the common bus, or vice versa;

an ATM/STM user network interface (ATM/STM UNI) for interfacing the ATM signal processed by the HIU CP and the STM signal through the HIU BIU, or vice versa; and

an optical transmitter (HIU OT) for performing optical/electronic interface to the signal interfaced by the ATM/STM UNI, accommodating the signal being transmitted to the data transfer network, or vice versa.

16. A host digital terminal, comprising:

a first unit outputting an asynchronous transfer mode signal, after an asynchronous transfer mode serial signal is converted into an asynchronous transfer mode parallel signal, an asynchronous transfer mode switching is performed according to transmission information of the asynchronous transfer mode parallel signal, and the asynchronous transfer mode parallel signal is re-converted into the asynchronous transfer mode serial signal, and for outputting a synchronous transfer mode signal, after the synchronous transfer mode dependent signal is received, and a virtual channel cross connection is performed;

a second unit, connected to the data transfer network, for receiving a signal transmitted from the data transfer network, extracting an asynchronous transfer mode signal from the transmitted signal, performing an inverse-multiplexing and each of second unit cell processes to the extracted asynchronous transfer mode signal, converting the extracted asynchronous transfer mode signal to the asynchronous transfer mode serial signal, and transmitting the asynchronous transfer mode serial signal to the first unit, sequentially;

a third unit, connected to a plurality of optical network units, for converting the asynchronous transfer mode serial signal transmitted from the first unit to the asynchronous transfer mode parallel signal, performing a multiplexing and each of host digital terminal cell processes to the asynchronous transfer mode parallel signal, transmitting the asynchronous transfer mode parallel signal to the connected optical network units, sequentially;

a fourth unit for performing control management functions for controlling mutual interactions among the units of the host digital terminal and data flows; and

a common bus to exchange all of the data among the units, the first, second, third, and fourth units being connected to the common bus.

17. The host digital of claim 16, with the common bus comprising:

a first bus unit exchanging an operation, administration and maintenance data;

a second bus unit transmitting a clock impression signal;

a third bus unit exchanging a virtual channel signal; and

a fourth bus unit exchanging a synchronous transfer mode signal.

18. The host digital terminal of claim 17, said first unit comprising:

a first sub-unit converting the transmitted asynchronous transfer mode serial signal to an asynchronous transfer mode parallel signal, or vice versa;

a second sub-unit switching the asynchronous transfer mode signal converted by the first subunit according to the transmission information of the asynchronous transfer mode signal, and for transmitting inversely the asynchronous transfer mode signal to the first sub-unit;

a third sub-unit for receiving a synchronous transfer mode dependent signal from the virtual channel bus and the synchronous transfer mode bus, for performing a bus interface, and vice versa; and

a fourth sub-unit performing a cross connection to the synchronous transfer mode dependent signal transmitted from the third sub-unit among one of the virtual channel-11, virtual channel-12, virtual channel-3 or virtual channel-4 class, and for transmitting inversely the synchronous transfer mode signal to the third sub-unit.

19. The host digital terminal of claim 18, the second unit comprising:

a fifth sub-unit, comprising a plurality of ports connected to the data transfer network through optical fiber cables, for receiving a signal from the data transfer network to perform an optical to electronic interface, or vice versa;

a sixth sub-unit receiving the optical to electronic interfaced signal from the fifth sub-unit to perform an asynchronous transfer mode interface to extract an asynchronous transfer mode signal, or vice versa;

a seventh sub-unit performing an inverse multiplexing to the extracted asynchronous transfer mode signal to do each kind of asynchronous transfer mode cell processes, or vice versa; and

an eighth sub-unit converting the cell processed asynchronous transfer mode signal to an asynchronous transfer mode serial signal transmittable to the first unit, or vice versa.

20. The host digital terminal of claim 19, the third unit comprising:

a ninth sub-unit converting the asynchronous transfer mode serial signal transmitted from the first unit to an asynchronous transfer mode parallel signal, or vice versa;

a tenth sub-unit performing multiplexing and each kind of cell processes to the asynchronous transfer mode parallel signal transmitted from the ninth sub-unit;

an eleventh sub-unit re-converting the asynchronous transfer mode signal from the tenth unit to a signal transmittable to the data transfer network, or vice versa; and

a twelfth sub-unit, connected to a plurality of optical network units through optical fiber cables, for performing an optical to electronic interface to the signal from the eleventh unit to be transmitted to the optical network unit, or vice versa.

21. The host digital terminal of claim 20, further comprising a fifth unit for performing:

an over head and pointer processes to an synchronous transfer mode-1 signal transmitted from the data transfer network, and the synchronous transfer mode-1 signal transmission to the common bus, or vice versa; and

a line interface, and an over head and pointer process to a signal transmitted from said data transfer network, and the signal transmission to the common bus through multiplexing in an administration unit, or vice versa.

22. The host digital terminal of claim 21, further comprised of a topology connected to the optical network unit being a star topology.

23. The host digital terminal of claim 22, with the star topology being an asynchronous transfer mode passive optical network.

24. The host digital terminal of claim 23, with the common bus comprised of a shelf, the shelf comprising at least twenty-one slots, while two fourth units and two first units are installed for duplication functions.

25. A method of a host digital terminal, comprising:

outputting an asynchronous transfer mode signal, after an asynchronous transfer mode serial signal is converted into an asynchronous transfer mode parallel signal, an asynchronous transfer mode switching is performed according to transmission information of the asynchronous transfer mode parallel signal, and the asynchronous transfer mode parallel signal is re-converted into the asynchronous transfer mode serial signal, and for outputting a synchronous transfer mode signal, after the synchronous transfer mode dependent signal is received, and a virtual channel cross connection is performed;

receiving a signal transmitted from the data transfer network, extracting an asynchronous transfer mode signal from the transmitted signal, performing an inverse-multiplexing and each of cell processes to the extracted asynchronous transfer mode signal, converting the extracted asynchronous transfer mode signal to the asynchronous transfer mode serial signal, and transmitting the asynchronous transfer mode serial signal, sequentially;

converting the asynchronous transfer mode serial signal transmitted to the asynchronous transfer mode parallel signal, performing a multiplexing and each of host digital terminal cell processes to the asynchronous transfer mode parallel signal, transmitting the asynchronous transfer mode parallel signal to connected optical network units, sequentially;

performing control management functions for controlling mutual interactions of the host digital terminal and data flows; and

exchanging all data in a common bus.

26. The method of claim 25, with the common bus comprising:

a first bus unit exchanging an operation, administration and maintenance data;

a second bus unit transmitting a clock impression signal;

a third bus unit exchanging a virtual channel signal; and

a fourth bus unit exchanging a synchronous transfer mode signal.

27. The method of claim 26, said step of outputting an asynchronous transfer mode signal, further comprising:

converting the transmitted asynchronous transfer mode serial signal to an asynchronous transfer mode parallel signal, or vice versa;

switching the asynchronous transfer mode signal converted by said step of converting the transmitted asynchronous transfer mode serial signal according to the transmission information of the asynchronous transfer mode signal, and for transmitting inversely the asynchronous transfer mode signal to said step of converting the transmitted asynchronous transfer mode serial signal;

receiving a synchronous transfer mode dependent signal from the virtual channel bus and the synchronous transfer mode bus, for performing a bus interface, and vice versa; and

performing a cross connection to the synchronous transfer mode dependent signal transmitted from said step of receiving a synchronous transfer mode dependent signal among one of the virtual channel-11, virtual channel-12, virtual channel-3 or virtual channel-4 class, and transmitting inversely the synchronous transfer mode signal to said step of receiving a synchronous transfer mode dependent signal.