 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
XRT75L00DIV Datasheet(PDF) 35 Page - Exar Corporation |
|
||||||||||||||||||||||||||||||
XRT75L00DIV Datasheet(HTML) 35 Page - Exar Corporation |
|
|
35 / 92 page  XRT75L00D REV. 1.0.2 E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER 30 The decoder block takes the output from clock and data recovery block and decodes the B3ZS (for DS3 or STS-1) or HDB3 (for E3) encoded line signal and detects any coding errors or excessive zeros in the data stream. Whenever the input signal violates the B3ZS or HDB3 coding sequence for bipolar violation or contains three (for B3ZS) or four (for HDB3) or more consecutive zeros, an active “High” pulse is generated on the RLCV output pins to indicate line code violation. NOTE: In Single- Rail (NRZ) mode, the decoder is bypassed. 5.4 LOS (Loss of Signal) Detector: 5.4.1 DS3/STS-1 LOS Condition: A Digital Loss of Signal (DLOS) condition occurs when a string of 175 ± 75 consecutive zeros occur on the line. When the DLOS condition occurs, the DLOS bit is set to “1” in the status control register. DLOS condition is cleared when the detected average pulse density is greater than 33% for 175 ± 75 pulses. Analog Loss of Signal (ALOS) condition occurs when the amplitude of the incoming line signal is below the threshold as shown in the Table 10.The status of the ALOS condition is reflected in the ALOS status control register. RLOS is the logical OR of the DLOS and ALOS states. When the RLOS condition occurs the RLOS output pin is toggled “High” and the RLOS bit is set to “1” in the status control register. DISABLING ALOS/DLOS DETECTOR: For debugging purposes it is useful to disable the ALOS/DLOS detector. Writing a “1” to the ALOS and DLOS bits disables the LOS detector on a per channel basis. 5.4.2 E3 LOS Condition: If the level of incoming line signal drops below the threshold as described in the ITU-T G.775 standard, the LOS condition is detected. Loss of signal level is defined to be between 15 and 35 dB below the normal level. If the signal drops below 35 dB for 175 ± 75 consecutive pulse periods, LOS condition is declared. This is illustrated in Figure 19. TABLE 10: THE ALOS (ANALOG LOS) DECLARATION AND CLEARANCE THRESHOLDS FOR A GIVEN SETTING OF REQEN (DS3 AND STS-1 APPLICATIONS) APPLICATION REQEN SETTING SIGNAL LEVEL TO DECLARE ALOS SIGNAL LEVEL TO CLEAR ALOS DS3 1<20mV >90mV STS-1 1<25mV >115mV |
Similar Part No. - XRT75L00DIV |
|
Similar Description - XRT75L00DIV |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
