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參數(shù)資料
| 型號(hào)： | XRT75R12DIB |
| 廠商： | EXAR CORP |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
| 中文描述： | DATACOM, PCM TRANSCEIVER, PBGA420 |
| 封裝： | 35 X 35 MM, TBGA-420 |
| 文件頁數(shù)： | 108/131頁 |
| 文件大?。?/td> | 717K |
| 代理商： | XRT75R12DIB |
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XRT75R12D
REV. P1.0.1
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
PRELIMINARY
103
Figure 52 presents an illustration of the bit-format within the 16-bit word (consist of the H1 and H2 bytes) with
the "I" bits designated.
N
OTE
:
At this time the "I" bits are inverted in order to denote that an "incrementing" pointer adjustment event is currently
occurring.
During the STS-1 frame that follows the "Byte-Stuffing" event
The "I" bits (within the "pointer-word") will be set back to their normal value; and the contents of the H1 and H2
bytes will be incremented by "1".
If f1 > f2
If frequency f1 is greater than f2, then this means that the STS-1 data is being clocked into the "Slip Buffer" at
a faster rate than is being clocked out. In this case, the "Slip Buffer" will start to fill up. Whenever this occurs,
a typical strategy is to delete (e.g., negative-stuff) a byte from the Slip Buffer. The purpose of this "negative-
stuffing" is to compensate for the frequency differences between f1 and f2; and to attempt to keep the "Slip
Buffer" at a somewhat constant fill-level.
N
OTE
:
This byte, which is being "un-stuffed" does carry valuable information for the user (e.g., this byte is typically a
payload byte). Therefore, whenever this negative stuffing occurs, two things must happen.
a.
The "negative-stuffed" byte must not be simply discarded. In other words, it must somehow also be
transmitted to the remote PTE with the remainder of the SPE data.
b.
The remote PTE must be notified of the occurrence of these "negative-stuffing" events. Further, the
remote PTE must know where to obtain this "negative-stuffed" byte.
Negative-Stuffing and Pointer-Decrementing in a SONET Network
Whenever this "byte negative-stuffing" occurs then the following other things occur within the STS-1 data-
stream.
During the STS-1 frame that contains the "Negative Byte-Stuffing" Event
a.
The "Negative-Stuffed" byte will be inserted into the H3 byte position. Whenever an SPE data byte is
inserted into the H3 byte position (which is ordinarily an unused byte), the number of bytes that will exist
between the H3 byte and the J1 byte within the very next SPE will be reduced by 1 byte. As a
consequence, in this case, the J1 byte (and in-turn, the rest of the SPE) will now be "byte-shifted"
towards the H3 byte position.
b.
The "Transmitting" Network Element will notify the remote terminal of this "negative-stuff" event by
inverting certain bits within the "pointer word" (within the H1 and H2 bytes) that are referred to as "D"
bits.
F
IGURE
52. A
N
I
LLUSTRATION
OF
THE
B
IT
F
ORMAT
WITHIN
THE
16-
BIT
WORD
(
CONSISTING
OF
THE
H1
AND
H2
BYTES
)
WITH
THE
"I"
BITS
DESIGNATED
D
I
D
I
D
I
D
I
D
I
S
S
N
N
N
N
LSB
MSB
H2 Byte
H1 Byte
10 Bit Pointer Expression
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