JPH07107061A - Au pointer processing system - Google Patents

Abstract

PURPOSE:To prevent proof stress to a bit error from lowering due to the increase of a painter value to be the object of a processing as an AU size becomes large at the time of an AU pointer processing in the pointer processing system of an SDH frame. CONSTITUTION:A pointer value selection block 3 receives the pointer values outputted for respective channels from pointer value reception blocks 2-1-2-(4<n>*3), selects and outputs the pointer value for which a specified four-channel portion is one set and also selects and outputs the pointer value for which every three channels in the ascending order of channel numbers of the channels of an AU-3 unit is one set. Respective processing blocks 4-1, 4-2-4-m and 4-(n+1) respectively receive and process size identification information from the blocks of the prestage and output the processing results 5-1, 5-2, 5-m and 5-(n+1) and 5-(n+2) of AU-4-4<n>c, AU-4-4<n-1>c, AU4-4<n-m+1>c and AU-4/AU-3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SDH (Synchronous Digital H) of a synchronous digital transmission network.
ierarchy: New Synchronous Digital Hierarchy)
Among the SDH frame pointer processing methods used in signal transmission devices, particularly AU (Administrative)
e Unit) -4-4c or larger size AU pointer processing method.

[0002]

2. Description of the Related Art A conventional AU pointer processing method of this type will be described with reference to FIG. FIG. 3 is a block diagram of an example of a conventional AU pointer processing method.

In FIG. 3, the H1 byte and H2 added to each channel [CH1, ..., CH (4 ⁿ * 3): n is an integer of 1 or more] in units of AU-3.
A pointer value 1 which is a signal indicating the head position of data to be processed having a byte structure is input to each channel CH1, ..., C
H (4 ⁿ * 3) pointer value receives and outputs for each receiving block ^{2-1, ~, 2- (4 n} * 3) and, these pointer values received blocks 2-1, ~, 2- (4 ⁿ A pointer value distribution block 7 that receives the pointer values output from the respective channels CH1, ..., CH (4 ⁿ * 3) from * 3) and distributes the pointer values of all channels to the blocks of the next stage, The pointer value output from the pointer value distribution block 7 for all channels CH1, ..., CH (4 ⁿ * 3) is received as a set, and the size of AU-4-4 ⁿ c is discriminated, and normal / abnormal is judged. Processing block 6-which performs the processing including the processing and outputs the processing result 5-1 and sends the size identification information to the block which performs the processing including the size identification of the AU-4-4 ^n-1 c, the determination of normality and the abnormality. 1, and ..., pointer value distribution block All of the channel CH from 7
1,-, CH (4 ⁿ * 3) as a set of pointer value outputs and size identification information from the processing block 6- (m + 1) are received to identify the size of AU-4-4 ^{n-m + 1} c , Processing block 6-m for performing processing including determination of normality / abnormality, outputting the processing result 5-m, and sending size identification information to processing block 6- (m-1), ..., Pointer value distribution All channels CH1, ..., C from block 7
AU-4 / receives the pointer value output with H (4 ⁿ * 3) as one set and the size identification information from the processing block 6-n.
Processing including size identification of AU-3, determination of normality and abnormality is performed, and the processing results 5- (n + 1) and 5- (n +)
Processing block 6- (n + 1) for outputting 2).

Here, the processing block 6-m, which performs processing including size identification, normality / abnormality determination, will be described in detail by taking the case of m = 1 (processing block 6-1) as an example.

In processing block 6-1, the channel CH
1, ~, receiving a pointer value of 4 ⁿ * 3 channels of CH (4 ⁿ * 3), whether the channel CH1 is normal, the channel CH2, ~, CH4 ⁿ * 3 is CI (Concaten
application indication (consolidated display).

If the channel CH1 is normal and all the channels CH2, ..., CH4 ⁿ * 3 are CI, the AU size is determined to be AU-4-4 ⁿ c, which is a normal state, and the processing result is obtained. 5-1 is output and AU-
The size identification information is sent to the processing block 6-2 which performs processing including size identification of 4-4 ^n-1 c, determination of normality and abnormality.

If the channel CH1 is not normal, it is determined to be in an abnormal state, and the channels CH2, ..., CH are
When at least one channel out of 4 ⁿ * 3 is not CI, it is identified that the AU size is not AU-4-4 ⁿ c, the processing result 5-1 is output, and AU-4
The size identification information is sent to the processing block 6-2 which performs the processing including the size identification of -4 ^n-1 c and the determination of normality / abnormality.

In processing block 6-2, AU-4-4 ^n.
The size identification information received from the processing block 6-1 that performs processing including size identification of c, determination of normality, and abnormality is AU-4.
If it is -4 ⁿ c, the process is stopped, and if it is not AU-4-4 ⁿ c, the process is executed.

Next, terms will be described. Figure 4 (a)
4B is a diagram showing a frame format of an SDH frame signal, and FIG. 4B is a diagram showing an area indicated by an AU size.

Referring to FIG. 4A, the SDH frame has overhead, a 9-byte AU pointer, and 26 bytes.
The SDH frame is composed of a data area of 1 byte × 9 rows (row), and the SDH frame without the overhead is an area indicated by the AU size.

The AU pointer is a signal indicating the start position of data in the data area, is added in units of AU-3, and is composed of 2 bytes of H1 byte and H2 byte.

This SDH frame is generally a multiplexed frame of various kinds having different AU sizes, for example, AU-3 and AU.
-4 or AU-4-4 ⁿ c (n is an integer of 1 or more)
Is further multiplexed, and S of the same capacity is also used.
The DH frame may have different multiplexing frame configurations.

It is sufficient that the sum of all the M values of the AU size of the constituent elements shown in FIG. 4B is equal to the value of N (shown in FIG. 4A) of the SDH frame. When the value of M of AU size is larger than 1, the AU pointer is AU-3.
Since it is added to the unit, there will be more than one.

At this time, the AU of the first AU-3 unit
The pointer contains a pointer value indicating the start position of normal data, but the other AU pointers contain a specific pattern called CI, which is the first A
It has the same pointer value as the AU pointer in U-3 units, which means that the data are connected.

[0015]

In this conventional AU pointer processing method, the number of pointer values (the number of channels) input to the processing blocks 6-1, ..., 6- (n + 1) as the AU size increases. Increase, especially AU-
4-4 ^{n-m +} 1c Size discrimination, normality / abnormality determination processing Among processing blocks 6-m, when the value of m is small, the number of concatenations increases, and therefore the processing target. Therefore, there is a problem in that the resistance to bit errors is reduced when the AU size is identified, because the number of pointer values becomes large.

It is an object of the present invention to prevent a decrease in the tolerance against bit errors due to an increase in the pointer value to be processed as the AU size increases in the AU pointer processing in the SDH frame pointer processing method. It is to provide an AU pointer processing method.

[0017]

According to the present invention, SDH
Even if the AU size becomes large, the pointer value used for the pointer processing of the frame is the AU pointer processing method characterized in that the AU channel is set to a maximum of four specific identifiable channels.

And, the embodiment is such that the channel of AU-3 unit [CH1, ..., CH (4 ⁿ * 3): where n is 1
[Pointer value] is added to each of the above integers] and a pointer value composed of H1 byte and H2 byte is input and received and output for each of the channels CH1, ..., CH (4 ⁿ * 3) The block and the pointer value output for each channel are received, and CH {(4P-
4) * 4 ^nm +1}, CH {(4P-3) * 4 ^nm +
1}, CH {(4P-2) * 4 ^nm +1} and CH
Four channels of {(4P-1) * 4 ^nm +1} (however, 1
≤ m ≤ n, 1 ≤ P ≤ 4 ^{m-1, where} m and P are integers) are selected as a set of pointer values, and channels AU-1, CH (4 ⁿ * 3) in units of AU-3 are selected. A pointer value selection block for selecting and outputting pointer values each having a set of three channels from the smallest channel number, and the four channels or 3 output from this pointer value selection block.
CH1 and C among pointer value outputs that make up one channel
AU-4-4 by receiving a pointer value having 4 channels of H (4 ^n-1 * 3 + 1), CH (2 * 4 ^n-1 * 3 + 1) and CH (3 * 4 ^n-1 * 3 + 1) as one set 4 ⁿ c size identification, processing including determination of normality / abnormality is performed, the processing result is output, and AU-4-4 ^n-1 c size identification is performed.
A processing block that sends size identification information to a block that performs processing including normal / abnormal determination, and CH {(4P-4)
* 4 ^nm * 3 + 1}, CH {(4P-3) * 4 ^nm * 3
+1}, CH {(4P-2) * 4 ^nm * 3 + 1} and CH {(4P-1) * 4 ^nm * 3 + 1} pointer value and AU-4-4 ^{n-m +} as one set. size identification of ² c, normal, size identifying the receiving size identification information from the processing block for performing processing including determination of abnormality ^{AU-4-4 n-m + 1} c, normal, including determination of abnormality processing A processing block which outputs the processing result and outputs size identification information to a processing block which performs processing including size identification of AU-4-4 ^nm c, determination of normality and abnormality;
Pointer value output with a set of channels and AU-4-4c
Receiving size identification information from a processing block that performs processing including size identification, normality, and abnormality determination of the AU-4 / AU
-3, a processing block that performs processing including size identification, normality / abnormality determination, and outputs the processing result.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the AU pointer processing system of the present invention.

The AU pointer processing method of this embodiment is AU
-3 unit channels [CH1, ..., CH ( ⁴ⁿ * 3):
However, n is an integer greater than or equal to 1]
Pointer value receiving blocks 2-1 to 2, which receive a pointer value composed of 1 byte and H2 bytes and receive and output for each channel CH1, ..., CH ( ⁴ⁿ * 3).
-(4 ⁿ * 3) and these pointer value reception blocks 2-
1,-, 2- (4 ⁿ * 3) from each channel CH1,
^{~, CH (4 n * 3} ) receives the pointer value output for each CH {(4P-4) * 4 nm +1}, CH {(4P-
3) * 4 ^nm +1}, CH {(4P-2) * 4 ^nm +
1} and CH {(4P-1) * 4 ^nm +1} for 4 channels (where 1 ≦ m ≦ n, 1 ≦ P ≦ 4 ^m−1 : m, P is an integer) as a set of pointer values A pointer value selection block 3 for selecting and outputting pointer values in which the channels CH1, ..., CH ( ⁴ⁿ * 3) in units of AU-3 are set in groups of three channels from the smallest channel number;
CH1, CH (4 ^n-1 * 3 + 1), CH (2 * 4 ^n-1 *) of the pointer value output from this pointer value selection block 3 which has 4 channels or 3 channels as one set
3 + 1) and ^{CH (3 * 4 n-1} * 3 + 1) Size identification of the AU-4-4 ⁿ c receives the pointer value to a set of four channels of normal, by performing a process including the determination of the abnormality processing size identification of the ^{AU-4-4 n-1} c and outputs the result 5-1, normally, it transmits the size identification information to the processing block 4-2 for performing processing including determination of abnormality AU-4-4 ⁿ
c processing block 4-1 and pointer value selection block 3
CH {(4P-4) * 4 ^nm * 3 + of the pointer values that output from 4 channels or 3 channels as one set
1}, CH {(4P-3) * 4 ^nm * 3 + 1}, CH
{(4P-2) * 4 ^nm * 3 + 1} and CH {(4P
-1) Pointer value with 4 channels of * 4 ^nm * 3 + 1} as one set and size identification of AU-4-4 ^{n-m + 2} c, normal,
Processing block 4- (m- that performs processing including abnormality determination
In response to the size information from 1), processing including size identification of AU-4-4 ^{n-m +} 1c, normality / abnormality determination is performed, the processing result 5-m is output, and AU-4-4 ^nm c
Of the size identification information to the processing block 4- (m + 1) which performs processing including size identification, normality, and abnormality determination
U-4-4 ^{n-m + 1} c processing block 4-m, pointer value output that sets 3 channels output from the pointer value selection block 3 as one set, and size identification of AU-4-4c, normal, Processing size 5- (n + 1) is obtained by receiving size identification information from the processing block 4-m which performs processing including abnormality determination and performing processing including size identification of AU-4 / AU-3 and determination of normality / abnormality. And AU- that outputs 5- (n + 2)
4 / AU-3 processing block 4- (n + 1).

Here, a processing block 4 for performing processing including size identification of AU-4-4 ^{n-m + 1} c, and determination of normality / abnormality.
-M will be described in detail with reference to FIG. 2 together with the case where n = 1 (m = 1 from 1 ≦ m ≦ n) as an example.

FIG. 2 is a diagram showing a comparison of H1 byte and H2 byte (pointer value) of each channel due to a difference in AU size, which is an example when n = 1.

In FIG. 2, N is the H1 byte and H2
It means that the byte is a normal pointer value, and CI means that the H1 byte and the H2 byte are the pointer value of the CI.

When n = 1, the H1 byte and the H2 byte of the input pointer value 1 are for 12 channels as shown in FIG. 2, and the pointer value of these 12 channels is the pointer value receiving blocks 2-1, ..., 2-. 12 is input.

In the pointer value selection block 3, the pointer values of the 12 channels received from the pointer value receiving blocks 2-1, ..., 2-12 are set to 4 pairs of channels CH 1, 4, 7 and 10. Select A
It is sent to a processing block 4-1 which performs processing including size identification of U-4-4c, determination of normality and abnormality.

In this processing block 4-1, channel C is used.
In response to the pointer values of H1, 4, 7 and 10, whether the channel CH1 is normal or not, the channels CH4, 7 and 1
Identify if 0 is CI.

If channel CH1 is normal and channels CH4, 7 and 10 are all CI, AU
It is determined that the size is AU-4-4c, which is in a normal state, and the processing result 5-1 is output, and AU-4 / AU
-3, the size identification information is sent to the processing block 4-2 which performs processing including size identification, normality / abnormality determination.

If the channel CH1 is not normal, it is judged to be in an abnormal state, and if at least one of the channels CH4, 7 and 10 is not CI, it is identified that the AU size is not AU-4-4c. Outputs the processing result 5-1 and outputs AU-4 / AU-
The size identification information is sent to the processing block 4-2 which performs processing including size identification of No. 3, size determination and normality / abnormality determination.

In this processing block 4-2, AU-4-
4c is the size identification information received from the processing block 4-1 for performing processing including size identification, normality / abnormality determination, and AU-
If it is 4-4c, the processing is stopped, and if it is not AU-4-4c, the processing is executed.

As can be seen from FIG. 2, AU-4-4c
And AU-4 differ only in channels CH4, 7 and 10, and these three channels and one parent channel (CH1)
The processing of AU-4-4c is possible if you see.

Further, when the AU size is AU-4, as can be seen from FIG. 2, processing can be performed with 3 channels.

[0033]

As described above, according to the present invention, in the AU pointer processing, even if the AU size becomes large, processing including size identification, normality, and abnormality determination is performed by the pointer values for up to four channels. , The resistance to bit errors at the time of size identification does not change even if the AU size increases, that is, it is possible to prevent the deterioration of the resistance.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an AU pointer processing system of the present invention.

FIG. 2 is a diagram showing a comparison of H1 byte and H2 byte (pointer value) of each channel according to a difference in AU size.

FIG. 3 is a block diagram of an example of a conventional AU pointer processing method.

4A is a diagram showing a frame format of an SDH frame signal, and FIG. 4B is a diagram showing an area indicated by an AU size.

[Explanation of symbols]

1 Pointer value (H1, H2 bytes) 2-1, ~, 2- (4 ⁿ * 3) Channel CH1,
,, CH (4 ⁿ * 3) pointer value reception block 3 Pointer value selection block 4-1 AU-4-4 ⁿ c processing block 4-2 AU-4-4 ^n-1 c processing block 4-m Processing block of AU-4-4 ^{n-m + 1} c 4- (n + 1) Processing block of AU-4 / AU-3 5-1 Processing result of AU-4-4 ⁿ c 5-2 AU-4-4 Processing result of ^n-1 c 5-m AU-4-4 Processing result of ^{n-m + 1} c 5- (n + 1) Processing result of AU-4 5- (n + 2) Processing result of AU-3 6-1 Conventional AU-4-4 ⁿ c processing block 6-2 Conventional AU-4-4 ^n-1 c processing block 6-m Conventional AU-4-4 ^{n-m + 1} c processing block 6- ( n + 1) Conventional AU-4 / AU-3 processing block 7 Pointer value distribution block

Claims (2)

[Claims] 1. An AU pointer processing method, wherein a pointer value used for pointer processing of an SDH frame is set to a specific maximum of 4 channels that can identify the AU channel even if the AU size becomes large. 2. A channel in units of AU-3 [CH1, ...,
CH (4 ⁿ * 3): where n is an integer of 1 or more], a pointer value composed of H1 byte and H2 byte added to each of
CH {(4P-4) * 4 ^nm +1}, CH by receiving the pointer value receiving block that is received and output for each CH (4 ⁿ * 3) and the pointer value that is output for each channel
{(4P-3) * 4 ^nm + 1}, CH {(4P-2) *
4 ^nm +1} and CH {(4P-1) * 4 ^nm +1}
4 channels (1≤m≤n, 1≤P≤4m ^-1 :
Select pointer values with m and P as integers as one set, and further select the channels CH1, ..., CH (4 ⁿ *) in units of AU-3.
3) 1 for each 3 channels from the smallest channel number
CH1 and CH (4 ^{n-1) of} the pointer value selection block that selects and outputs the pointer value to be set, and the pointer value output that outputs 4 channels or 3 channels from this pointer value selection block as one set. * 3 + 1), CH
(2 * 4 ^n-1 * 3 + 1) and CH (3 * 4 ^n-1 * 3 +
AU is received by receiving the pointer value of 4) of 1) as one set.
-4-4 ^nc Performs processing including size discrimination, normality / abnormality determination, outputs the processing result, and AU-4-
CH {(4P-4) * 4 ^nm * 3 + 1}, CH that sends size identification information to a block that performs processing including 4 ^n-1 c size identification, normality / abnormality determination, and CH
{(4P-3) * 4 ^nm * 3 + 1}, CH {(4P-
2) * 4 ^nm * 3 + 1} and CH {(4P-1) * 4
^In response to size identification information from a processing block that performs processing including a pointer value with a set of 4 channels of ^nm * 3 + 1} and size identification of AU-4-4 ^{n-m + 2} c, and determination of normality / abnormality Performs processing including size discrimination of AU-4-4 ^{n-m +} 1c, judgment of normality / abnormality, and outputs the processing result, and size discrimination of AU-4-4 ^nm c, judgment of normality / abnormality A processing block that sends size identification information to a processing block that performs a process including a pointer value output that sets the three channels as one set, and a process block that performs size identification of AU-4-4c, and determination of normality / abnormality Receiving a size identification information from the AU-4 / AU-3, performing a process including size identification of the AU-4 / AU-3, determining whether the AU-4 / AU-3 is normal, and outputting a processing result thereof.
The AU pointer processing method described.