參數(shù)資料
型號(hào): XRT7300IV
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PQFP44
封裝: 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁(yè)數(shù): 24/55頁(yè)
文件大小: 608K
代理商: XRT7300IV
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.1
á
20
shape and width to meet the applicable pulse
template requirement.
5.
The LOS Declaration/Clearance Criteria is estab-
lished.
2.0
Figure 1 indicates that the Transmit Section of the
XRT7300 consists of the following blocks:
Transmit Logic Block
Duty Cycle Adjust Block
HDB3/B3ZS Encoder
Pulse Shaping Block
The purpose of the Transmit Section in the XRT7300
is to take TTL/CMOS level data from the terminal
equipment and encode it into a format that can:
1.
be efficiently transmitted over coaxial cable at E3,
DS3 or STS-1 data rates.
2.
be reliably received by the Remote Terminal at
the other end of the E3, DS3 or STS-1 data link.
THE TRANSMIT SECTION
3.
comply with the applicable pulse template
requirements.
2.1
T
HE
T
RANSMIT
L
OGIC
B
LOCK
The purpose of the Transmit Logic Block is to accept
either Dual-Rail or Single-Rail (a binary data stream)
TTL/CMOS level data and timing information from the
Terminal Equipment.
Accepting Dual-Rail Data from the Terminal
Equipment
The XRT7300 accepts Dual-Rail data from the Termi-
nal Equipment via the following input signals:
TPDATA
TNDATA
TCLK
Figure 10 illustrates the typical interface for the trans-
mission of data in a Dual-Rail Format between the
Terminal Equipment and the Transmit Section of the
XRT7300.
F
IGURE
10. T
HE
T
YPICAL
I
NTERFACE
FOR
THE
T
RANSMISSION
OF
D
ATA
IN
A
D
UAL
-R
AIL
F
ORMAT
F
ROM
THE
T
RANS
-
MITTING
T
ERMINAL
E
QUIPMENT
TO
THE
T
RANSMIT
S
ECTION
OF
THE
XRT7300
Exar E3/DS3/STS-1 LIU
(E3/DS3 or STS-1
Framer)
Terminal
Equipment
(E3/DS3 or STS-1
TxPOS
TxNEG
TxLineClk
Block
Transmit
Logic
Block
TPDATA
TNDATA
TCLK
F
IGURE
11. H
OW
THE
XRT7300 S
AMPLES
THE
D
ATA
ON
THE
TPDATA
AND
TNDATA I
NPUT
P
INS
TCLK
TPDATA
TNDATA
Data 1 1 0 0
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