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參數(shù)資料
| 型號(hào)： | XRT75VL00D |
| 廠商： | Exar Corporation |
| 英文描述： | E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER |
| 中文描述： | E3/DS3/STS-1線路接口單元與SONET DESYNCHRONIZER |
| 文件頁數(shù)： | 66/92頁 |
| 文件大?。?/td> | 836K |
| 代理商： | XRT75VL00D |
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XRT75VL00D
REV. 1.0.3
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
64
In the "Slip Buffer, the "input" STS-1 data (labeled "STS-1 Data_IN") is latched into the FIFO, upon a given
edge of the corresponding "STS-1 Clock_f1" input clock signal. The STS-1 Data (labeled "STS-1 Data_OUT")
is clocked out of the Slip Buffer upon a given edge of the "STS-1 Clock_f2" input clock signal.
The behavior of the data, passing through the "Slip Buffer" is now described for each possible relationship
between frequencies f1 and f2.
If f1 = f2
If both frequencies, f1 and f2 are exactly equal, then the STS-1 data will be "clocked" into the "Slip Buffer" at
exactly the same rate that it is "clocked out". In this case, the "Slip Buffer" will neither fill-up nor become
depleted. As a consequence, no pointer-adjustments will occur in this STS-1 data stream. In other words, the
STS-1 SPE will remain at a constant location (or offset) within each STS-1 envelope capacity for the duration
that this STS-1 signal is supporting this particular service.
If f1 < f2
If frequency f1 is less than f2, then this means that the STS-1 data is being "clocked out" of the "Slip Buffer" at
a faster rate than it is being clocked in.
In this case, the "Slip Buffer" will eventually become depleted.
Whenever this occurs, a typical strategy is to "stuff" (or insert) a "dummy byte" into the data stream. The
purpose of stuffing this "dummy byte" is to compensate for the frequency differences between f1 and f2, and
attempt to keep the "Slip Buffer, at a somewhat constant fill level.
NOTE: This "dummy byte" does not carry any valuable information (not for the user, nor for the system).
Since this "dummy byte" carries no useful information, it is important that the "Receiving PTE" be notified
anytime this "dummy byte" stuffing occurs. This way, the Receiving Terminal can "know" not to treat this
"dummy byte" as user data.
Byte-Stuffing and Pointer Incrementing in a SONET Network
Whenever this "byte-stuffing" occurs then the following other things occur within the STS-1 data stream.
During the STS-1 frame that contains the "Byte-Stuffing" event
a. The "stuff-byte" will be inserted into the byte position immediately after the H3 byte. This insertion of the
"dummy byte" immediately after the H3 byte position will cause the J1 byte (and in-turn, the rest of the
SPE) to be "byte-shifted" away from the H3 byte. As a consequence, the offset between the H3 byte posi-
tion and the STS-1 SPE will now have been increased by 1 byte.
b. The "Transmitting" Network Equipment will notify the remote terminal of this byte-stuffing event, by invert-
ing certain bits within the "pointer word" (within the H1 and H2 bytes) that are referred to as "I" bits.
FIGURE 44. AN ILLUSTRATION OF AN STS-1 SIGNAL BEING PROCESSED VIA A SLIP BUFFER
SLIP BUFFER
STS-1 Data_IN
STS-1 Clock_f1
STS-1 Data_OUT
STS-1 Clock_f2
Clock Domain operating
At frequency f1
Clock Domain operating
At Frequency f2.
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| XRT83SL34IV | QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR |
| XRT83SL34 | QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR |
| XS2F-A422-90-A | 4 CONTACT(S), POLYBUTYLENE TEREPHTHALATE, FEMALE, CIRCULAR CONNECTOR, CLAMP, SOCKET |
| XS2F-A422-A90-A | 4 CONTACT(S), POLYBUTYLENE TEREPHTHALATE, FEMALE, CIRCULAR CONNECTOR, CLAMP, SOCKET |
| XS2F-A422-AB0-A | 4 CONTACT(S), POLYBUTYLENE TEREPHTHALATE, FEMALE, CIRCULAR CONNECTOR, CLAMP, SOCKET |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT75VL00D_08 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET |
| XRT75VL00D1V-F | 制造商:Exar Corporation 功能描述: |
| XRT75VL00DES | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 1CHT3/E3/STS1LIU+ DESYNC 3.3V DRV VER RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| XRT75VL00DIV | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 3.3V 1 CH E3/DS3/STS W/SONET DE-SYNCH RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| XRT75VL00DIV-F | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 3.3V 1 CH E3/DS3/STS W/SONET DE-SYNCH RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
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