參數(shù)資料
型號： 28233-11
廠商： CONEXANT SYSTEMS
元件分類： 數(shù)字傳輸電路
英文描述： ATM Transmitter/Receiver with UTOPIA Interface
中文描述： TRANSCEIVER, PQFP160
封裝： PLASTIC, MQFP-160
文件頁數(shù)： 47/161頁
文件大小： 1832K
代理商： 28233-11
Application ID channel. Internally generated as all 1s.
CN8223
2.0 Functional Description
ATM Transmitter/Receiver with UTOPIA Interface
2.3 Overhead Generation
100046C
Conexant
2-13
2.3 Overhead Generation
The CN8223 automatically receives and generates line overhead. For additional
flexibility, line overhead can be monitored and inserted for STS-3c, STM-1, and
G.832 E3/E4 modes.
2.3.1 Internal DS3 Mode
The transmitter circuitry automatically generates all F and M framing bits. The
transmitter calculates the parity of each M-frame and inserts this data into bits P1
and P2 of the following M-frame. Bits X1 and X2 contain 1s unless Transmit
Alarm Control [bit 6] of CONFIG_2 [0x01] is set. If this bit is set, bits X1 and X2
contain 0s. All C bit positions are generated automatically by the transmitter.
Overhead generation of DS3 values is summarized in
Table 2-8
.
Table 2-8. DS3 Overhead Values
Overhead Bits
CN8223 Operation
X1, X2
Yellow alarm bits set from CONFIG_2, bit 6.
P1, P2
Calculates and inserts frame parity. No error insertion.
M123
Internally generated 010 pattern. No error insertion.
F1234
Internally generated 1001 pattern. No error insertion.
C1 Subframe 1
C2 Subframe 1
Network requirement bit. Internally generated as all 1s.
C3 Subframe 1
FEAC channel. Internally generated under processor control.
C123 Subframe 2
Unused. Internally generated as all 1s.
C123 Subframe 3
Path parity. Same value inserted as P1, P2 in all 3 bits. No error insertion.
C123 Subframe 4
FEBE indication. Internally generated as all 1s. If receiver detects a path parity, or M123 or F1234 error,
then non-111 code is inserted for one frame.
C123 Subframe 5
Terminal data link. Data or all 1s from internal HDLC formatter when enabled.
C123 Subframes 6, 7
Internally generated as all 1s.
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