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參數(shù)資料
| 型號(hào)： | XRT7245 |
| 廠商： | Exar Corporation |
| 英文描述： | DS3 ATM User Network Interface(DS3異步傳輸模式用戶網(wǎng)絡(luò)接口) |
| 中文描述： | DS3自動(dòng)柜員機(jī)用戶網(wǎng)絡(luò)接口（DS3異步傳輸模式用戶網(wǎng)絡(luò)接口） |
| 文件頁(yè)數(shù)： | 140/324頁(yè) |
| 文件大小： | 4103K |
| 代理商： | XRT7245 |
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XRT7245
DS3 UNI FOR ATM
á
PRELIMINARY
REV. 1.03
140
The role of each of these bit-fields and their corre-
sponding output pins are depicted below.
The logic state of the input pins can be monitored by
reading the contents of the “Line Interface Scan”
Register, as depicted below.
Bit 5—REQB (Receive Equalization Enable/
Disable Select)
This “Read/Write” bit-field allows the user to control
the state of the “REQB” output pin of the UNI device.
This output pin is intended to be connected to the
“REQB” input pin of the XRT7300 DS3/E3 LIU IC. If
the user forces this signal to toggle “high”, then the
internal Receive Equalizer (within the XRT7300 device)
will be disabled. Conversely, if the user forces this
signal to toggle “l(fā)ow”, then the Receive Equalizer
(within the XRT7300 device) will be enabled.
The purpose of the internal Receive Equalizer (within
the XRT7300 device) is to compensate for the
“Frequency-Dependent” attenuation (e.g., cable-loss),
that a line signal will experience as it travels through
coaxial cable, from the transmitting to the receiving
terminal.
Writing a “1” to this bit-field causes the UNI device to
toggle the “REQB” output pin “high”. Writing a “0” to
this bit-field causes the UNI device to toggle the
“REQB” output pin “l(fā)ow”.
For information on the criteria that should be used
when deciding whether to enable or disable the
Receive Equalizer, please consult the XRT7300 device.
Note:
If the customer is not using the XRT7300 DS3/E3/
STS-1 IC, then he/she can use this bit-field and the “REQB”
output pin for other purposes.
Bit 4—TAOS (Transmit All Ones Signal)
This “Read/Write” bit-field allows the user to control
the state of the “TAOS” output pin of the UNI device.
This output pin is intended to be connected to the
“TAOS” input pin of the XRT7300 DS3/E3/STS-1 LIU
IC. If the user forces this signal to toggle “high”, then
the XRT7300 device will transmit an “All Ones” pat-
tern onto the line. Conversely, if the user commands
this output signal to toggle “l(fā)ow” then the XRT7300
DS3/E3/STS-1 LIU IC will proceed to transmit data
based upon the pattern that it receives via the TxPOS
and TxNEG output pins (of the UNI IC).
Writing a “1” to this bit-field will cause the “TAOS” out-
put pin to toggle “high”. Writing a “0” to this bit-field
will cause this output pin to toggle “l(fā)ow”.
Note:
If the customer is not using the XRT7300 DS3/E3/
STS-1 LIU IC, then he/she can use this bit-field, and the
“TAOS” output pin for other purposes.
Bit 3—Encodis (B3ZS Encoder Disable)
This “Read/Write” bit-field allows the user to control
the state of the “Encodis” output pin of the UNI device.
This output pin is intended to be connected to the
“Encodis” input pin of the XRT7300 DS3/E3/STS-1
LIU IC. If the user forces this signal to toggle “high”,
then the “internal B3ZS encoder” (within the XRT7300
device) will be disabled. Conversely, if the user com-
mand this output signal to toggle “l(fā)ow”, then the
“internal B3ZS encoder” (within the XRT7300 device)
will be enabled.
Writing a “1” to this bit-field causes the UNI IC to
toggle the “Encodis” output pin “high”. Writing a “0”
to this bit-field
Note:
1. The B3ZS encoder, within the XRT7300 device, is
not to be confused with the B3ZS encoding capa-
ble that exists within the Transmit DS3 Framer
block of the UNI IC.
2. The user is advised to disabled the B3ZS encoder
(within the XRT7300 IC) if the Transmit and
Receive DS3 Framers (within the UNI) are config-
ured to operate in the B3ZS line code.
3. If the customer is not using the XRT7300 DS3/E3/
STS-1 LIU IC, then he/she can use this bit-field
and the “Encodis” output pin for other purposes.
4. It is permissible to tie both the “Encodis” and
“Decodis” input pins (of the XRT7300 device) to the
“Encodis” output pin of the XRT7245 DS3 UNI.
Bit 2—TxLev (Transmit Line Build-Out Enable/
Disable Select)
This “Read/Write” bit-field allows the user to control
the state of the “TxLev” output pin of the UNI device.
This output pin is intended to be connected to the
“TxLev” input pin of the XRT7300 DS3/E3 LIU IC.
Writing a “1” to this bit-field commands the UNI to
toggle the TxLev output “high”. Writing a “0” to this
bit-field commands the UNI to toggle this output
signal “l(fā)ow”.
If the user commands this signal to toggle “high”,
then the Transmit Line Build-Out circuitry, within the
XRT7300 device will be disabled. In this mode, the
XRT7300 LIU IC will generate unshaped (e.g., square)
pulses out onto the line, via the TTIP and TRING
output pins.
Conversely, if the user commands this signal to toggle
“l(fā)ow”, then the Transmit Line Build-Out circuitry, within
the XRT7300 device will be enabled. In this mode,
XRT7300 LIU IC will generate shaped pulses out onto
the line, via the TTIP and TRING output pins.
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| XRT7288IP | CEPT1 Line Interface |
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| XRT7250IQ100 | 制造商:EXAR 制造商全稱:EXAR 功能描述:DS3/E3 FRAMER IC |
| XRT7288 | 制造商:EXAR 制造商全稱:EXAR 功能描述:CEPT1 Line Interface |
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