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參數(shù)資料
| 型號： | XRT7300IVTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 40/55頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E3/DS3/STS-1 SGL 44TQFP |
| 標準包裝： | 1,000 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | DS3，E3，STS-1 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LQFP |
| 供應商設備封裝： | 44-TQFP（10x10） |
| 包裝： | 帶卷 (TR) |
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XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
41
2. The Transmit Drive Monitor feature can also be
used to monitor the Transmit Output Line Signal of
another LIU IC as illustrated in Figure 32.
Presented in Figure 32, if LIU # 1 (U1) fails, then LIU
# 2 (U2) drives its DMO output pin “High”. Likewise, if
LIU # 2 (U2) fails, then LIU # 1 (U1) drives its DMO
output pin “High”.
The scheme presented in Figure 32 is a better design
approach. It overcomes situations in which a LIU
monitoring its own signal (Figure 31) may experience
a failure mode such that it cannot drive a bipolar sig-
nal onto the line. That same failure mode may pre-
vent the LIU from driving the DMO output pin “High”.
4.6
THE TAOS (TRANSMIT ALL ONES) FEATURE
The XRT7300 can transmit an all “1’s” pattern onto
the line by toggling a single input pin or by setting a
single bit-field in one of the Command Registers to
“1”.
NOTE: When this feature is activated, the Transmit Section
of the XRT7300 overwrites the Terminal Equipment data
with this all “1’s” pattern.
This feature can be activated by either of the follow-
ing methods.
When the XRT7300 is operating in the Hardware
Mode:
Configure the device to transmit an all “1’s” pattern by
toggling the TAOS input pin (pin 2) “High”. Terminate
the all “1’s” pattern by toggling the TAOS input pin
“Low”.
When the XRT7300 is operating in the HOST
Mode:
If the XRT7300 is operating in the HOST Mode, the
TAOS input pin is disabled. Consequently, the
XRT7300 can be configured to transmit an all “1’s”
pattern by writing to Command Register CR1 and set-
ting the TAOS bit-field (bit D3) to “1”.
The all “1’s” pattern can be terminated by writing to
Command Register CR1 and setting the TAOS bit-
field (D3) to “0".
FIGURE 32. TWO LIU’S, EACH MONITORING THE TRANSMIT OUTPUT SIGNAL OF THE OTHER LIU IC
R1
36
BNC
T1
R2
36
R7
36
BNC
R8
36
TTIP
TRING
R3
270
R4
270
R5
270
R6
270
TRING
TTIP
MRING
MTIP
MRING
MTIP
DMO_Channel_2
DMO_Channel_1
DMO
T2
PE-68629
TXOFF
U1
U2
COMMAND REGISTER CR1 (ADDRESS = 0X01)
D4
D3
D2
D1
D0
TXOFF
TAOS
TXCLKINV
TXLEV
TXBIN
0
1
X
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