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XRT7250 Datasheet(PDF) 192 Page - Exar Corporation

Part # XRT7250
Description  DS3/E3 FRAMER IC
PDF  463 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7250 Datasheet(HTML) 192 Page - Exar Corporation

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DS3/E3 FRAMER IC
XRT7250
REV. 1.1.1
173
4.2.5
The Transmit DS3 Line Interface Block
The XRT7250 Framer IC is a digital device that takes
DS3 payload and overhead bit information from some
terminal equipment, processes this data and ultimate-
ly, multiplexes this information into a series of out-
bound DS3 frames. However, for DS3 coaxial cable
applications, the XRT7250 Framer IC lacks the cur-
rent drive capability to be able to directly transmit this
DS3 data stream through some transformer-coupled
coax cable with enough signal strength for it to com-
ply with the Isolated Pulse Template requirements
and be received by the remote receiver. Therefore, in
order to get around this problem, the Framer IC re-
quires the use of an LIU (Line Interface Unit) IC. An
LIU is a device that has sufficient drive capability,
along with the necessary pulse-shaping circuitry to
be able to transmit a signal through the transmission
medium in a manner that it can (1) comply with the
DSX-3 Isolated Pulse Template requirements and (2)
be reliably received by the Remote Terminal Equip-
ment. Figure 65 presents a circuit drawing depicting
the Framer IC interfacing to an LIU (XRT7300 DS3/
E3/STS-1 Transmit LIU).
TX DS3 F-BIT MASK2 REGISTER, ADDRESS = 0X37
BIT 7BIT 6BIT 5BIT 4BIT 3BIT2BIT 1BIT 0
FBit Mask(23) FBit Mask(22) FBit Mask(21) FBit Mask(20) FBit Mask(19) FBit Mask(18) FBit Mask(17) FBit Mask(16)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0000
000
TX DS3 F-BIT MASK3 REGISTER, ADDRESS = 0X38
BIT 7BIT 6BIT 5BIT 4BIT 3BIT2BIT 1BIT 0
FBit Mask(15) FBit Mask(14) FBit Mask(13) FBit Mask(12) FBit Mask(11) FBit Mask(10) FBit Mask(9)
FBit Mask(8)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0000
000
TX DS3 F-BIT MASK4 REGISTER, ADDRESS = 0X39
BIT 7BIT 6BIT 5BIT 4BIT 3BIT2BIT 1BIT 0
FBit Mask(7)
FBit Mask(6)
FBit Mask(5)
FBit Mask(4)
FBit Mask(3)
FBit Mask(2)
FBit Mask(1)
FBit Mask(0)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0000
000



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