Frame transmitting/receiving method and device

Abstract

A frame transmitting method and device insert a channel identifier into predetermined free bytes of parallel channel signals whose phases are different from each other without a phase adjustment, and convert the parallel channel signals into a serial signal to transmit a frame. A frame receiving method and device convert a serial signal whose phase is not adjusted on the transmission side into parallel channel signals, detect a frame pattern from a single channel signal within the parallel channel signals to detect a channel identifier inserted into a predetermined free byte of the single channel signal, and further rearrange channels between all of the parallel channel signals without a phase adjustment, based on the channel identifier.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects and advantages of the invention will be apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which the reference numerals refer to like parts throughout and in which:

FIG. 1 is a block diagram showing an embodiment [1] (in case of 2-channel multiplexing) of a frame transmitting device realizing a frame transmitting method according to one aspect of the present invention;

FIGS. 2A and 2B are diagrams showing a checking bit position in an STS1 frame and an STS3 frame;

FIG. 3 is a block diagram showing an embodiment [1] (in case of 2-channel multiplexing) (No. 1) of a frame receiving device realizing a frame receiving method according to one aspect of the present invention;

FIG. 4 is a block diagram showing an embodiment [1] (in case of 2-channel multiplexing) (No.2) of a frame receiving device realizing a frame receiving method according to one aspect of the present invention;

FIG. 5 is a transition diagram of a synchronization protection state in a frame synchronization/CH identification circuit and a frame synchronization circuit used for a frame receiving device in one aspect of the present invention;

FIGS. 6A-6C are diagrams showing an MSB adjusting operation example of bytes in a frame receiving device in one aspect of the present invention;

FIG. 7 is a block diagram showing an embodiment [2] (in case of 2-channel multiplexing) of a frame transmitting device realizing a frame transmitting method according to one aspect of the present invention;

FIG. 8 is a block diagram showing an embodiment [2] of a frame receiving device realizing a frame receiving method according to one aspect of the present invention;

FIG. 9 is a block diagram showing an embodiment [3] of a frame transmitting device realizing a frame transmitting method according to one aspect of the present invention;

FIG. 10 is a diagram showing an STS3 frame used for the present invention and its scramble field;

FIGS. 11A and 11B are sequence diagrams showing an operation example in the embodiment [3] of the frame transmitting device shown in FIG. 9;

FIGS. 12A-12C are time charts showing a P/S conversion operation example (phase shift is not shown) in the embodiment [3] of the frame transmitting device shown in FIG. 9;

FIG. 13 is a block diagram showing an embodiment [3] of a frame receiving device realizing a frame receiving method according to one aspect of the present invention;

FIGS. 14A-14E are time charts (MSB adjusting and phase shift are not shown) showing an operation example of the embodiment [3] of the frame receiving device shown in FIG. 13;

FIG. 15 is a block diagram showing an embodiment [4] of a frame transmitting device realizing a frame transmitting method according to one aspect of the present invention;

FIG. 16 is a block diagram showing an embodiment [4] of a frame receiving device realizing a frame receiving method according to one aspect of the present invention;

FIG. 17 is a block diagram showing a prior art frame transmitting device;

FIG. 18 is a block diagram showing a prior art frame receiving device; and

FIGS. 19A and 19B are mapping image diagrams to an upper layer in the prior art example.

Claims

1. A frame transmitting method comprising: a first step of inserting a channel identifier without a phase adjustment into predetermined free bytes of parallel channel signals whose phases are different from each other; anda second step of converting the parallel channel signals into a serial signal.

2. A frame receiving method comprising: a first step of converting a serial signal whose phase is not adjusted on a transmission side into parallel channel signals;a second step of detecting a frame pattern from a single channel signal within the parallel channel signals to detect a channel identifier inserted into a predetermined free byte of the single channel signal; anda third step of rearranging channels between all of the parallel channel signals without a phase adjustment, based on the channel identifier.

3. The frame transmitting method as claimed in claim 1, wherein the second step includes a step of inverting signals of odd number channels or even number channels within the parallel channel signals and then converting the signals into the serial signal.

4. The frame receiving method as claimed in claim 2, wherein the third step includes a step of further inverting signals of odd number channels or even number channels within all of the channel signals rearranged.

5. The frame receiving method as claimed in claim 2, further comprising a fourth step of detecting another corresponding frame pattern from a single channel signal within groups other than a group to which the single channel signal belongs among predetermined m (m≧2) number of groups whose phases are different from each other, composing the parallel channel signals; and a fifth step of rearranging the frame patterns detected at the second and fourth step respectively, based on the channel identifier.

6. The frame receiving method as claimed in claim 2, further comprising a sixth step of generating an MSB timing based on the frame pattern detected at the second step; and a seventh step of performing MSB adjusting of the parallel channel signals based on the MSB timing before the channel rearrangement at the third step.

7. The frame transmitting method as claimed in claim 1, wherein the parallel channel signal and the serial signal are signals of STS-N (N=1, 3, . . . ) or STM-N (N=0, 1, . . . ).

8. The frame receiving method as claimed in claim 2, wherein the parallel channel signal and the serial signal are signals of STS-N (N=1, 3, . . . ) or STM-N (N=0, 1, . . . ).

9. A frame transmitting device comprising: a first means inserting a channel identifier without a phase adjustment into predetermined free bytes of parallel channel signals whose phases are different from each other; anda second means converting the parallel channel signals into a serial signal.

10. A frame receiving device comprising: a first means converting a serial signal whose phase is not adjusted on a transmission side into parallel channel signals;a second means detecting a frame pattern from a single channel signal within the parallel channel signals to detect a channel identifier inserted into a predetermined free byte of the single channel signal; anda third means rearranging channels between all of the parallel channel signals without a phase adjustment, based on the channel identifier.

11. The frame transmitting device as claimed in claim 9, wherein the second means includes a means inverting signals of odd number channels or even number channels within the parallel channel signals and then converting the signals into the serial signal.

12. The frame receiving device as claimed in claim 10, wherein the third means includes a means further inverting signals of odd number channels or even number channels within all of the channel signals rearranged.

13. The frame receiving device as claimed in claim 10, further comprising a fourth means detecting another corresponding frame pattern from a single channel signal within groups other than a group to which the single channel signal belongs among predetermined m (m≧2) number of groups whose phases are different from each other, composing the parallel channel signals; and a fifth means rearranging the frame patterns detected by the second and fourth means respectively, based on the channel identifier.

14. The frame receiving device as claimed in claim 10, further comprising a sixth means generating an MSB timing based on the frame pattern detected by the second means; and a seventh means performing MSB adjusting of the parallel channel signals based on the MSB timing before the channel rearrangement by the third means.

15. The frame transmitting device as claimed in claim 9, wherein the parallel channel signal and the serial signal are signals of STS-N (N=1, 3, . . . ) or STM-N (N=0, 1, . . . ).

16. The frame receiving device as claimed in claim 10, wherein the parallel channel signal and the serial signal are signals of STS-N (N=1, 3, . . . ) or STM-N (N=0, 1, . . . ).