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TheMT9075BframingalgorithmsupportsautomaticinterworkingofinterfaceswithandwithoutCRC-... The MT9075B framing algorithm supports automatic
interworking of interfaces with and without CRC-4
processing capabilities. That is, if an interface with
CRC-4 capability, achieves valid basic frame
alignment, but does not achieve CRC-4 multiframe
alignment by the end of a predefined period, the
distant end is considered to be a non-CRC-4
interface. When the distant end is a non-CRC-4
interface, the near end automatically suspends
receive CRC-4 functions, continues to transmit CRC-
4 data to the distant end with its E-bits set to zero,
and provides a status indication. Naturally, if the
distant end initially achieves CRC-4 synchronization,
CRC-4 processing will be carried out by both ends.
This feature is selected when control bit AUTC (page
01H, address 11H) is set to zero.
Notes for Synchronization State Diagram
(Figure 10)
1) The basic frame alignment, signalling multiframe
alignment, and CRC-4 multiframe alignment
functions operate in parallel and are independent.
2) The receive channel associated signalling bits and
signalling multiframe alignment bit will be frozen
when multiframe alignment is lost.
3) Manual re-framing of the receive basic frame
alignment and signalling multiframe alignment functions
can be performed at any time.
4) The transmit RAI bit will be one until basic frame
alignment is established, then it will be zero.
5) E-bits can be optionally set to zero until the
equipment interworking relationship is established.
When this has been determined one of the following
will take place:
a) CRC-to-non-CRC operation - E-bits = 0,
b) CRC-to-CRC operation - E-bits as per G.704 and
I.431.
6) All manual re-frames and new basic frame
alignment searches start after the current frame
alignment signal position.
7) After basic frame alignment has been achieved,
loss of frame alignment will occur any time three
consecutive incorrect basic frame alignment signals
are received. Loss of basic frame alignment will reset
the complete framing algorithm.
8) When CRC-4 multiframing has been achieved, the
primary basic frame alignment and resulting
multiframe alignment will be adjusted to the basic
frame alignment determined during CRC-4
synchronization. Therefore, the primary basic frame
alignment will not be updated during the CRC-4
multiframing search, but will be updated when the
CRC-4 multiframing search is complete.
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TOM涛
2008-03-22
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该mt9075b诬告算法支持自动
互通的介面,并没有华润- 4
处理能力。也就是说,如果一个界面
华润- 4能力,达到有效的基本框架
定线,但未能达到在华润- 4 multiframe
对齐到去年底,在预定时期内,
遥远的结束被认为是一个非华润- 4
界面。当遥远的结束是一个非华润- 4
接口,近完自动停止
获得华润- 4职能,继续传递华润-
四数据传送到遥远的结束,其电子商务位设为零,
并提供了一个状态指示灯。当然,如果
遥远的结束,初步实现了华润- 4同步,
华润- 4处理将所进行的两端。
这个功能是挑选时,控制位autc (专页
1小时,地址11小时) ,是一套几乎为零。
注释同步状态图
(图10 )
1 )基本帧定界,信令multiframe
对齐和华润- 4 multiframe对齐
职能平行运作,并为独立的。
2 )接收通道相关信令点滴
信令multiframe对准位将会被冻结
当multiframe对准的是失去了。
3 )手动重新制定了接受基本框架
对齐和信令multiframe对齐功能
可以表现在任何时候。
4 )传输詹瑞位将是一个直到基本框架
对齐确立,那将为零。
5 )电子商务位可有选择地设为零,直到
设备的互通关系,是建立。
当这个已经确定下列情形之一的
会发生:
一)华润到非华润运作-电子商务位= 0 ,
b )在华润到华润运作-电子商务位为每g .704和
i.431 。
6 )所有人工重新框及新的基本框架
对齐搜查开始后,当前帧
对准信号的位置。
7 )后,基本帧定界已基本完成,
损失帧定会发生任何时间3
连续不正确基本框架对准信号
收到。损失的基本帧定将复位
完全诬告算法。
8 )当华润- 4 multiframing已经达到,
小学基本帧定界和由此产生的
multiframe路线将有所调整基本
帧定界决心在华润- 4
同步。因此,首要的基本框架
对齐,将不会被更新,在华润- 4
multiframing搜索,但将得到更新的时候
华润- 4 multiframing搜索完成了。
whistlewolf
2008-03-22 · TA获得超过3020个赞
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点点分就像搞这么多,太痴心妄想了
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