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XRT86L30IV 参数 Datasheet PDF下载

XRT86L30IV图片预览
型号: XRT86L30IV
PDF下载: 下载PDF文件 查看货源
内容描述: 单一T1 / E1 / J1成帧器/ LIU COMBO [SINGLE T1/E1/J1 FRAMER/LIU COMBO]
分类和应用:
文件页数/大小: 284 页 / 1793 K
品牌: EXAR [ EXAR CORPORATION ]
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XRT86L30  
SINGLE T1/E1/J1 FRAMER/LIU COMBO  
REV. 1.0.1  
14.2.2  
CAS Multi-Frames and Channel Associated Signaling  
CAS Multi-Frames are only relevant if the user is using CAS or Channel Associated Signaling. If the user is  
implementing Common Channel Signaling then the CAS Multi-Frame is not available.  
14.2.2.1  
Channel Associated Signaling  
If the user operates an E1 channel in Channel Associated Signaling, then timeslot 16 octets within each E1  
frame will be reserved for signaling. Such signaling would convey information such as On-Hook, Off-Hook  
conditions, call set-up, control, etc. In CAS, this type of signaling data that is associated with a particular voice  
channel will be carried within timeslot 16 of a particular E1 frame within a CAS Multi-Frame. The CAS is  
carried in a Multi-Frame structure which consists of 16 consecutive E1 frames. The framing/byte format of a  
CAS Multi-Frame is presented in Figure 108.  
FIGURE 108. FRAME/BYTE FORMAT OF THE CAS MULTI-FRAME STRUCTURE  
A Single CAS Multiframe  
Timeslot 16  
Timeslot 16  
Frame 1  
Timeslot 16  
Timeslot 16  
Frame 15  
Frame 0  
Frame 2  
ABCD  
ABCD  
ABCD  
xyxx  
ABCD  
ABCD ABCD  
0000  
Signaling Data  
Associated with  
Timeslot 15  
Signaling Data  
Associated with  
Timeslot 2  
Signaling Data  
Associated with  
Timeslot 1  
CAS Multiframe  
Alignment Pattern  
Signaling Data  
Associated with  
Timeslot 31  
Signaling Data  
Associated with  
Timeslot 17  
Signaling Data  
Associated with  
Timeslot 18  
x = “dummy bits”  
y = Carries the Multiframe “Yellow Alarm” bit  
Timeslot 16 within frame 0 is a special octet that is used to convey CAS Multi-Frame alignment information,  
and to convey Multi-Frame alarm information to the Remote Terminal. The bit-format of timeslot 16 within  
frame 0 of a CAS Multi-Frame is 0000 xyxx. The upper nibble of this octet contains all zeros and is used to  
identify itself as the CAS Multi-Frame alignment signal. If CAS is used, then the user is advised to insure that  
none of the other timeslot 16 octets contain the value "0000". The lower nibble of this octet contains the  
expression "xyxx". The x-bits are the spare bits and should be set to "0" if not used. The y-bit is used to  
indicate a Multi-Frame alarm condition to the Remote terminal. During normal operation, this bit-field is  
cleared to "0". However, if the Local Receive E1 Framer detects a problem with the incoming Multi-Frames,  
then the Local Transmit E1 Framer will set this bit-field within the next outbound CAS Multi-Frame to "1".  
NOTE: The Local Transmit E1 Framer will continue to set the y-bit to "1" for the duration that the Local Receive E1 Framer  
detects this problem.  
Timeslot 16 within Frame 1 of the CAS Multi-Frame contains 4 bits of signaling data for voice channel 1 and 4  
bits of signaling data for voice channel 17. Timeslot 16 within Frame 2 contains 4 bits of signaling data for  
voice channel 2 and 4 bits of signaling data for voice channel 18, and this continues for all E1 frames.  
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