參數(shù)資料
型號: CN8223EPF
英文描述: ATM/SONET TRANSCEIVER|CMOS|QFP|160PIN|PLASTIC
中文描述: 的ATM / SONET的收發(fā)器|的CMOS | QFP封裝| 160PIN |塑料
文件頁數(shù): 68/161頁
文件大?。?/td> 1865K
代理商: CN8223EPF
0
DS3, E3
2.0 Functional Description
CN8223
2.6 ATM Cell Processing
ATM Transmitter/Receiver with UTOPIA Interface
2-34
Conexant
100046D
This capability can be used to verify far-end FEBE operation. BIP generation
can be disabled via the Overhead Control bits. The fields of the G1 octet are
under control of the All 0s FEBE [bit 14], All 1s FEBE [bit 13], and Transmit
Alarm Control [bits 9
4] of CONFIG_2. The FEBE controls operate as shown in
Table 2-21
.
The yellow alarm bit in the G1 octet is set to the value contained in Transmit
Alarm Control [bit 7].
The C1 octet is under control of PHY Type [bits 2
0] of CONFIG_1 [0x00],
Force Cycle Stuffing [bit 6] of CONFIG_3 [0x02], and Overhead Control [bits
3
0] of CONFIG_2 [0x01] as shown in
Table 2-22
.
The trailer content (except in E1 mode where there is no trailer) has each
nibble set to 1100 unless Overhead Control [bit 0] is set. In this case, each nibble
has the value 0000.
In 53-octet formats, no PLCP overhead is associated with each ATM cell. The
only overhead present is that contained in the line framing format, as discussed in
Section 2.2
.
Table 2-21. FEBE Controls
All 1s FEBE
All 0s FEBE
FEBE Field Value
0
0
BIP-8 Errors Received
0
1
0000
1
0
1111
1
1
0000
Table 2-22. C1 Octet
Disable C1
Generation
PHY Type
Force Cycle
Stuffing
C1 Octet Value
1
x
x
00
0
DS1, E1
x
00
0
Per Selected 8 kHz Reference
(Via CONFIG_1, Bit 11)
0
DS3, E3
1
Per Default Cycle
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