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PM4328-PI 参数 Datasheet PDF下载

PM4328-PI图片预览
型号: PM4328-PI
PDF下载: 下载PDF文件 查看货源
内容描述: 高密度T1 / E1成帧器,集成M13多路复用器 [HIGH DENSITY T1/E1 FRAMER WITH INTEGRATED M13 MULTIPLEXER]
分类和应用: 复用器数字传输控制器电信集成电路电信电路异步传输模式ATM
文件页数/大小: 250 页 / 1399 K
品牌: PMC [ PMC-SIERRA, INC ]
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STANDARD PRODUCT  
PM4328 TECT3  
DATASHEET  
PMC-2011596  
ISSUE 1  
HIGH DENSITY T1/E1 FRAMER  
AND M13 MULTIPLEXER  
therefore the TNEG/TMFP signal is suppressed during loopback so that transmit  
MFP indications will not be seen nor accumulated as input LCVs. If the UNI bit is  
clear, then the interface is configured for bipolar signals RPOS and RNEG,  
therefore the TNEG is fed directly to the RNEG input. This diagnostic loopback  
can be used when configured as a multiplexer or as a framer only. The DS3  
loopback mode is shown diagrammatically in Figure 38.  
Figure 38: DS3 Diagnostic Loopback Diagram  
F
MX12 #7  
MX12 #6  
RCLK  
R
RPOS/  
RDAT  
RNEG/  
RLCV  
DS3  
F
FRMR  
R
F
MX12 #5  
R
F
MX12 #4  
R
MX12 #3  
MX23  
F
R
F
MX12 #2  
MX12 #1  
UNI  
R
TCLK  
TPOS/  
TDAT  
TNEG/  
TMFP  
F
DS3  
R
TRAN  
M
R
Optional  
AIS  
Insertion  
DS3 Line Loopback  
DS3 Line Loopbacks allow the received DS3 streams to be looped back into the  
transmit DS3 paths, overriding the DS3 streams created internally by the  
multiplexing of the lower speed tributaries. The transmit signals on TPOS/TDAT  
and TNEG/TMFP are substituted with the receive signals on RPOS/RDAT and  
RNEG/RLCV. The TCLK signal is also substituted with the receive DS3 clock,  
RCLK. While this mode is active, AIS may be substituted for the DS3 payload  
being transmitted on the TPOS/TDAT and TNEG/TMFP outputs. Note that the  
transmit interface must be configured to be the same as the DS3 FRMR receive  
interface for this mode to work properly. The DS3 line loopback mode is shown  
diagrammatically in Figure 39. There is a second form of line loopback which  
only loops back the DS3 payload. In this mode the DS3 framing overhead is  
regenerated for the received DS3 stream and then retransmitted. Line loopback  
is selected with the LLOOP bit in the DS3 Master Data source register and  
payload loopback is selected by the PLOOP bit in the same register.  
PROPRIETARY AND CONFIDENTIAL  
155  
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