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參數(shù)資料
| 型號(hào)： | XRT7302 |
| 廠商： | Exar Corporation |
| 英文描述： | 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) |
| 中文描述： | 2頻道E3/DS3/STS-1線路接口單元（2通道E3/DS3/STS-1線接口單元） |
| 文件頁數(shù)： | 52/62頁 |
| 文件大小： | 715K |
| 代理商： | XRT7302 |
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XRT7302
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
á
PRELIMINARY
REV. P1.1.6
48
Turn off the Channel(n) Transmit Driver by setting the
TxOFF(n) bit-field in Command Register CR1-(n) to
"1".
COMMAND REGISTER CR1-(n)
Writing a "0" into this bit-field enables the Channel(n)
Transmit Driver.
N
OTE
:
In order to permit a system designed for redundancy
to quickly shut-off a defective line card and turn-on the
back-up line card, the XRT7302 was designed such that
either Transmitter can quickly be turned-on or turned-off by
toggling the TxOFF(n) input pins. This approach is much
quicker then setting the TxOFF(n) bit-fields via the Micro-
processor Serial Interface.
Table 6 presents a Truth Table which relates the set-
ting of the TxOFF external pin and bit-field for a chan-
nel to the state of the Transmitter. This table applies
to both Channels of the XRT7302.
To control the state of each transmitter via the Micro-
processor Serial interface, connect the TxOFF(n) in-
put pins to GND.
4.5
T
HE
T
RANSMIT
D
RIVE
M
ONITOR
F
EATURES
The Transmit Drive Monitor is used to monitor the line
in the Transmit Direction for the occurrence of fault
conditions such as a short circuit on the line, a defec-
tive Transmit Drive in the XRT7302 or another LIU.
Activate the Channel(n) Transmit Drive Monitor by
connecting the MTIP(n) pin to the TTIP(n) line
through a 270 Ohm resistor connected in series, and
connecting the MRing(n) pin to the TRing(n) line
through a 270 Ohm resistor connected in series.
Such an approach is illustrated in Figure 30.
D4
D3
D2
D1
D0
TxOFF(n) TAOS(n)
TxClkINV(n)
TxLEV(n) TxBIN(n)
1
X
X
X
X
T
ABLE
6: T
HE
R
ELATIONSHIP
B
ETWEEN
THE
T
X
OFF I
NPUT
P
IN
,
THE
T
X
OFF B
IT
F
IELD
AND
THE
S
TATE
OF
THE
T
RANSMITTER
S
TATE
OF
THE
T
X
OFF
I
NPUT
P
IN
S
TATE
OF
THE
T
X
OFF
B
IT
F
IELD
S
TATE
OF
THE
T
RANSMITTER
LOW
0
ON (Transmitter is Active)
LOW
1
OFF (Transmitter is Tri-Stated)
HIGH
0
OFF (Transmitter is Tri-Stated)
HIGH
1
OFF (Transmitter is Tri-Stated)
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