參數(shù)資料
型號: 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): 30/62頁
文件大?。?/td> 715K
代理商: XRT7302
XRT7302
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
á
PRELIMINARY
REV. 1.1.6
26
The manner that the LIU handles Dual-Rail data is
described below and illustrated in Figure 8. The
Transmit Section of a Channel typically samples the
data on the TPData and TNData input pins on the fall-
ing edge of TxClk(n).
TxClk(n) is the clock signal that is of the selected data
rate frequency for E3 = 34.368 MHz, DS3 = 44.736
MHz and STS-1 = 51.84 MHz. If the Transmit Section
samples a “1" on the TPData input pin, the Transmit
Section of the XRT7302 generates a positive polarity
pulse via the TTIP(n) and TRing(n) output pins across
a 1:1 transformer. If the Transmit Section samples a
"1" on the TNData input pin, then the Transmit Sec-
tion ultimately generates a negative polarity pulse via
the TTIP(n) and TRing(n) output pins across a 1:1
transformer.
2.1.2
Configure Channel(n) to accept Single-
Rail Data from the Terminal Equipment
To transmit data in a Single-Rail data from the Termi-
nal Equipment, configure the XRT7302 in the HOST
Mode.
Write a "1" into the TxBin(n) (TRANSMIT BINary) bit-
field of Command Register CR1-(n) shown below.
N
OTE
:
Please refer to Table 2 for the Address of the individ-
ual Channel(n).
The Transmit Section of each channel samples this
input pin on the falling edge of the TxClk(n) clock sig-
nal and encodes this data into the appropriate bipolar
line signal across the TTIP(n) and TRing(n) output
pins.
N
OTES
:
F
IGURE
7. T
HE
TYPICAL
INTERFACE
FOR
D
ATA
T
RANSMISSION
IN
D
UAL
-R
AIL
F
ORMAT
FROM
THE
T
RANSMITTING
T
ERMINAL
E
QUIPMENT
TO
THE
T
RANSMIT
S
ECTION
OF
A
CHANNEL
OF
THE
XRT7302
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
Exar E3/DS3/STS-1 LIU
Transmit
Logic
Block
TxPOS
TxNEG
TxLineClk
TPData
TNData
TxClk
F
IGURE
8. H
OW
THE
XRT7302 S
AMPLES
THE
DATA
ON
THE
TPD
ATA
AND
TND
ATA
INPUT
PINS
TxClk
TPData
TNData
Data 1 1 0
COMMAND REGISTER CR1-(N)
D4
D3
D2
D1
D0
TxOFF(n)
TAOS(n) TxClkINV(n) TxLEV(n)
TxBin(n)
X
X
X
X
1
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