Granted Patent B2

US 8,040,887 · App. 11/453,794 · Granted Oct 18, 2011

Abstract

Claims (44)

1. Switching equipment apparatus for use in a communications network for processing E1-type data frames, the switching equipment:

comprising an interface that receives at least one E1-type data frame addressed to a given E1 destination port; and

a processor that groups at least some of said E1-type data frames to constitute at least one group of at most n E1-type data frames, where the at most n E1-type data frames is grouped based on a common Ethernet destination port providing access to a respective E1 destination port of each E1-type data frame;

associates with each group a control header comprising data that represents the group; and

encapsulates the E1-type data frames of each group and the associated control header in a payload data field of an Ethernet frame to send the Ethernet frame to said common Ethernet destination port; and

wherein the respective common Ethernet destination port provides access to the plurality of destination E1 ports.

2. The switching equipment according to claim 1 , wherein said equipment periodically delivers an Ethernet frame comprising at most n E1-type data frames and the associated control header addressed to a common Ethernet destination port.

3. The switching equipment according to claim 1 , wherein said equipment, in the event of grouping a number of E1-type data frames greater than n, builds-at least two Ethernet frames each comprising at most n E1-type data frames designating the same common Ethernet destination port.

4. The switching equipment according to claim 1 , wherein the number n of E1 frames in a group is an integer from 1 to 46.

5. The switching equipment according to claim 1 , wherein said equipment integrates into at least some of the control headers data representing an Ethernet frame number or a sequence number and/or synchronization information.

6. The switching equipment according to claim 1 , wherein said equipment adds a header comprising data representing at least said given E1 destination port to each E1 frame received before encapsulating said E1 frame and the added header in said payload data field of an Ethernet frame.

7. The switching equipment according to claim 6 , wherein said equipment integrates into at least some of the headers added to the E1-type data frames data representing the frame type or at least one frame status and/or timing justification information.

8. The switching equipment according to claim 1 , wherein said equipment upon receiving an Ethernet frame encapsulates at most n E1 frames to extract said encapsulated E1 frames from said Ethernet frame to deliver them to outputs providing access to their respective given E1 destination ports.

9. E1-type line physical termination equipment (ETPL) for use in a communications network, the E1-type line physical terminal equipment comprises:

at least one E1 line interface unit that receives E1 data frames and

at least one switching equipment according to claim 1 coupled to said E1 line interface unit in order to exchange E1 frames with it.

10. E1-type line logical termination equipment for use in a communications network, the E1-type line logical termination equipment comprises:

i) at least one switching equipment according to claim 1 that exchanges Ethernet frames encapsulating at most n E1 frames with an E1 line physical termination equipment,

said E1 line physical termination equipment comprising at least one E1 line interface unit that receives E1 data frames and at least one said switching equipment coupled to said E1 line interface unit in order to exchange E1 frames with the E1 line interface unit and

ii) a framer that is fed with E1 frames by said switching equipment and extracts from said E1 frames the channel that the E1 frames contain.

11. E1-type line logical termination equipment according to claim 10 , wherein the E1-type line logical termination equipment comprises a processor that processes said channels extracted by said framer.

12. Frame switching equipment for use in an asynchronous communications network, the frame switching equipment comprises:

i) at least one Ethernet frame switch (AT) comprising at least one input that receives Ethernet frames generated by an E1 line physical termination equipment,

said E1-type line physical terminal equipment comprising at least one E1 line interface unit that receives E1 data frames and

at least one switching equipment, the switching equipment receiving at least one E1-type data frame addressed to a given E1 destination port, and encapsulating said received E1-type data frame in a payload data field of an Ethernet frame to send the Ethernet frame to an Ethernet destination port providing access to said given E1 destination port, where the Ethernet frame that is sent consists of layer 2 header information and the payload data field of the Ethernet frame, according to claim 1 coupled to said E1 line interface unit in order to exchange E1 frames with the E1 line interface unit and switch each Ethernet frame received to an output selected as a function of instructions and

ii) at least one E1 line logical termination equipment fed with Ethernet frames by said Ethernet frame switch (AT), said E1 line logical termination equipment comprising:

a) at least one said switching equipment according to claim 1 that exchanges Ethernet frames encapsulating at most n E1 frames with an E1 line physical termination equipment,

said E1 line physical termination equipment comprising at least one E1 line interface unit that receives E1 data frames and

at least one said switching equipment according to claim 1 coupled to said E1 line interface unit in order to exchange E1 frames with the E1 line interface unit; and

b) a framer means fed with E1 frames by said switching equipment according to claim 1 that extracts from said E1 frames the channel that said E1 frames contain.

13. The switching equipment according to claim 1 , wherein the at least one E1-data frame is received on a first network equipment comprising a plurality of processor modules and the Ethernet frame is sent to a second network equipment comprising a plurality of processor modules; wherein the given E1 destination port is an E1 destination port of a framing module.

14. A method for a processor apparatus for use in a communications network for processing TDM data frames, wherein the method comprises:

receiving a plurality of TDM data frames where each received TDM data frame is addressed to a destination Ethernet port where the destination Ethernet port provides access to an E1 destination port of each TDM data frame wherein a destination Ethernet port provides access to the E1 destination port;

associating a header with each received TDM data frame;

forming a group comprising at least one TDM data frame comprising a same destination Ethernet port that provides access to an E1 destination port of each TDM data frame, where the same destination Ethernet port provides access to a plurality of destination E1 ports and the E1 destination port comprises the at least one TDM frame when the processor apparatus receives the at least one TDM frame;

associating with the group of at least one TDM data frame a control header;

encapsulating the group comprising the control header, the at least one TDM data frame and the header associated with each at least one TDM data frame, in a payload data field of an Ethernet frame where the Ethernet frame consists of layer 2 header information, and the Ethernet payload data field; and

sending the Ethernet frame to the same destination Ethernet port.

15. The method of claim 14 wherein the header associated with each received TDM data frame comprises a destination port number where the destination port number comprises the logical TDM port to which the TDM frame is addressed.

16. The method of claim 15 wherein the header associated with each received TDM data frame further comprises:

a sequence number, an L1 field and an L2 field where the L1 field and the L2 field indicates a direction of the Ethernet frame sent between two processor apparatus; an E/T field which indicates a TDM data frame type, an LOS field where the LOS field indicates status of bit synchronization; a J1 field and a J2 field where the J1 field and the J2 field indicate a timing offset.

17. The method of claim 14 wherein the control header further comprises an Ethernet frame number and a sequence number where the Ethernet flame number indicates the relative position of an Ethernet frame in a plurality of Ethernet frames comprising a sequence of Ethernet frames that are sent to a common destination Ethernet port and the sequence number indicates if a packet has been lost.

18. The method of claim 17 wherein the control header further comprises a SY1 field and an SY0 field which indicates synchronization information of an Ethernet frame.

19. The method according to claim 14 , wherein the plurality of TDM data frames are received on a first network equipment comprising a plurality of processor modules and the Ethernet frame is sent to a second network equipment comprising a plurality of processor modules; and wherein the E1 destination port is an E1 destination port of a framing module.

Assignments (11)