參數(shù)資料
型號(hào)： T7264
英文描述： T7264 U-Interface 2B1Q Transceiver
中文描述： T7264 U型接口2B1Q收發(fā)器
文件頁(yè)數(shù)： 21/54頁(yè)
文件大?。?/td> 876K
代理商： T7264
Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
Lucent Technologies Inc.
21
U-Interface Description
Data is transmitted over the U-interface in 240-bit groups called U frames. Each U frame consists of an 18-bit syn-
chronization word (ISW or SW), 12 blocks of 2B+D data (216 bits), and six overhead bits (M). A U-interface super-
frame consists of eight U frames grouped together. The beginning of a U superframe is indicated by the inverted
sync word (ISW). The six overhead bits from each of the eight U frames, when taken together, form the 48 M bits.
The following diagram shows how U frames, superframes, and M bits are mapped.
5-5171
Figure 12. U-Interface Frame and Superframe
Of the 48 M bits, 24 bits form the embedded operations channel (eoc) for sending messages from the LT to the NT
and responses from the NT to the LT. There are two eoc messages per superframe with 12 bits per eoc message
(eoc1 and eoc2). Another 12 bits serve as control and status bits (UCS). The last 12 bits form the cyclic redun-
dancy check (crc) which is calculated over the 2B+D data and the M4 bits of the previous superframe. Figure 13
shows the different groups of bits in the superframe.
5-5172
Figure 13. U-Interface Superframe Bit Groups
U1
U2
U3
U4
U5
U6
U7
U8
ISW[18]
M[6]
(2B+D) X 12 [216 bits]
U-INTERFACE M BITS [48]
U-SUPERFRAME SPAN = 12 ms
U-FRAME SPAN = 1.5 ms
BIT #
1—18
19—234
235
236
237
238
239
240
FRAME #
Sync
12(2B+D)
M1
M2
M3
M4
M5
M6
1
ISW
CONTROL & STATUS (UCS)
2
3
eoc1
4
5
SW
2B+D
6
7
8
eoc2
crc
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