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MT9074AL 参数 Datasheet PDF下载

MT9074AL图片预览
型号: MT9074AL
PDF下载: 下载PDF文件 查看货源
内容描述: T1 / E1 / J1单芯片收发器 [T1/E1/J1 Single Chip Transceiver]
分类和应用: 电信集成电路
文件页数/大小: 122 页 / 371 K
品牌: MITEL [ MITEL NETWORKS CORPORATION ]
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Advance Information  
MT9074  
The SLC-96 frame structure is similar to the D4  
frame structure, except a facility management  
overlay is superimposed over the erstwhile Fs bits,  
see Table 9.  
Frame #  
Ft  
Fs  
Signalling  
1
2
1
0
0
1
1
1
0
3
0
1
0
1
0
The protocol appropriate for the application is  
selected via the Framing Mode Selection Word,  
address 10H of Master Control page 1. In T1 mode  
MT9074 is capable of generating the overhead bit  
framing pattern and (for ESF links) the CRC  
remainder for transmission onto the DS1 trunk. The  
beginning of the transmit multiframe may be  
determined by any of the following criteria:  
4
5
6
A
B
7
8
9
10  
11  
12  
(i)It may free - run with the internal multiframe  
counters;  
Table 7 - D4 Superframe Structure(T1)  
(ii)The multiframe counters may be reset with the  
external hardware pin TxMF. If this signal is not  
synchronous with the current transmit frame count it  
may cause the far end to go temporarily out of sync.  
Frame #  
FPS  
FDL  
CRC  
Signalling  
1
2
X
(iii) Under software control (by setting the TxSYNC  
bit in page 01 address 12H) the transmit multiframe  
counters will be synchronized to the framing pattern  
present in the overhead bits multiplexed into channel  
31 bit 0 of the incoming 2.048 Mb/s digital stream  
DSTi. Note that the overhead bits extracted from the  
receive signal are multiplexed into outgoing DSTo  
channel 31 bit 0.  
CB1  
3
X
X
X
X
X
X
X
X
X
X
X
4
0
0
1
0
1
1
5
6
CB2  
CB3  
CB4  
CB5  
CB6  
A
B
C
D
7
8
9
(iv) In SLC - 96 mode the transmit frame counters  
synchronize to the framing pattern clocked in on the  
TXDL input.  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
Table 8 - ESF Superframe Structure (T1)  
15  
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