參數(shù)資料
型號: XRT86VL3X_07
廠商: Exar Corporation
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 54/153頁
文件大?。?/td> 1316K
代理商: XRT86VL3X_07
XRT86VL3X
47
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
REV. 1.2.2
5.0
LIU TRANSMIT PATH
5.1
Transmit Diagnostic Features
In addition to TAOS, the XRT86VL3x offers multiple diagnostic features for analyzing network integrity such as
ATAOS, Network Loop Code generation, and QRSS on a per channel basis by programming the appropriate
registers. These diagnostic features take priority over the digital data provided by the Framer block. The
transmitters will send the diagnostic code to the line and will be maintained in the digital loopback if selected.
5.1.1
TAOS (Transmit All Ones)
The XRT86VL3x has the ability to transmit all ones on a per channel basis by programming the appropriate
channel register. This function takes priority over the digital data provided by the Framer block. For example:
If a fixed "0011" pattern is provided by the Framer block and TAOS is enabled, the transmitter will output all
ones.
Figure 46
is a diagram showing the all ones signal at TTIP and TRING.
5.1.2
ATAOS (Automatic Transmit All Ones)
If ATAOS is selected by programming the appropriate global register, an AMI all ones signal will be transmitted
for each channel that experiences an RLOS condition. If RLOS does not occur, the ATAOS will remain inactive
until an RLOS on a given channel occurs. A simplified block diagram of the ATAOS function is shown in
Figure 47
.
5.1.3
Network Loop Up Code
By setting the LIU to generate a NLUC, the transmitters will send out a repeating "00001" pattern. The output
waveform is shown in
Figure 48
.
F
IGURE
46. TAOS (T
RANSMIT
A
LL
O
NES
)
F
IGURE
47. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
ATAOS F
UNCTION
TAOS
1
1
1
RLOS
ATAOS
TAOS
TTIP
TRING
Tx
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