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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  
mode. When an OOF occurs, the FERF value is held at the state contained in  
the last buffer location corresponding to the previous sixth M-frame or G.747  
frame. This location is not updated until the OOF condition is deasserted.  
Meanwhile, the last four of the remaining five buffer locations are loaded with the  
frozen FERF state while the first buffer location corresponding to the current M-  
frame/ G.747 frame is continually updated every M-frame/G.747 frame based on  
the above FERF definition. Once correct frame alignment has been found and  
OOF is deasserted, the first buffer location will contain a valid FERF status and  
the remaining five buffer locations are enabled to be updated every M-frame or  
G.747 frame.  
DS2 M-bit and F-bit framing errors are indicated as are G.747 framing word  
errors (or bit errors) and G.747 parity errors. These error indications are  
accumulated for performance monitoring purposes in internal, microprocessor  
readable counters. The performance monitoring accumulators continue to count  
error indication even while the framer is indicating OOF.  
The DS2 FRMR may be configured to generate interrupts on error events or  
status changes. All sources of interrupts can be masked or acknowledged via  
internal registers. Internal registers are also used to configure the DS2 FRMR.  
9.27 M12 Multiplexer (MX12)  
The MX12 M12 Multiplexer integrates circuitry required to asynchronously  
multiplex and demultiplex four DS1 streams into, and out of, an M12 formatted  
DS2 serial stream (as defined in ANSI T1.107 Section 7) and to support  
asynchronous multiplexing and demultiplexing of three 2048 kbit/s into and out of  
a G.747 formatted 6312 kbit/s high speed signal (as defined in CCITT Rec.  
G.747).  
When multiplexing four DS1 streams into an M12 formatted DS2 stream, the  
MX12 TSB performs logical inversion on the second and fourth tributary streams.  
Rate adaptation to the DS2 is performed by integral FIFO buffers, controlled by  
timing circuitry. The FIFO buffers accommodate in excess of 5.0 UIpp of  
sinusoidal jitter on the DS1 clocks for all jitter frequencies. X, F, M, and C bits  
are also generated and inserted by the timing circuitry. Software control is  
provided to transmit Far End Receive Failure (FERF) indications, DS2 AIS, and  
DS1 payload loopback requests. The loopback request is coded by inverting one  
of the three C-bits (the default option is compatible with ANSI T1.107a Section  
8.2.1 and TR-TSY-000009 Section 3.7).Two diagnostic options are provided to  
invert the transmitted F or M bits.  
When demultiplexing four DS1 streams from an M12 formatted DS2, the MX12  
performs bit destuffing via interpretation of the C-bits. The MX12 also detects  
and indicates DS1 payload loopback requests encoded in the C-bits. As per  
PROPRIETARY AND CONFIDENTIAL  
84  
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