參數(shù)資料
型號： XRT73L02
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)： 35/62頁
文件大?。?/td> 716K
代理商： XRT73L02
á
XRT73L02
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
PRELIMINARY
REV. P1.1.0
31
2.4.3
Line Build-Out Circuit
Design Guideline for Setting the Transmit
The TxLEV_(n) input pins or bit-fields should be set
based upon the overall cable length between the
Transmitting Terminal and the Digital Cross Connect
system where the pulse template measurements are
made.
If the cable length between the Transmitting Ter-
minal and the DSX-3 or STSX-1 is less than 225
feet, enable the Transmit Line Build-Out circuit by
setting the TxLEV_(n) input pin or bit-field to "0".
N
OTE
:
In this case, the configured channel outputs shaped
(e.g., not square-wave) pulses onto the line via its TTIP_(n)
and TRing_(n) output pins. The shape of this output pulse
is such that it complies with the pulse template require-
ments even when subjected to cable loss ranging from 0 to
225 feet.
If the cable length between the Transmitting Ter-
minal and the DSX-3 or STSX-1 is greater than 225
feet, disable the Transmit Line Build-Out circuit
by setting the TxLEV_(n) input pin or bit-field to
"1".
N
OTE
:
In this case, the configured channel in the
XRT73L02 outputs partially-shaped pulses onto the line via
the TTIP_(n) and TRing_(n) output pins. The cable loss
that these pulses experience over long cable lengths (e.g.,
greater than 225 feet) causes these pulses to be properly
shaped and comply with the appropriate pulse template
requirement.
2.4.4
The Transmit Line Build-Out Circuit and
E3 Applications
The ITU-T G.703 Pulse Template Requirements for
E3 states that the E3 transmit output pulse should be
measured at the Secondary Side of the Transmit Out-
put Transformer for Pulse Template compliance. In
other words, there is no Digital Cross Connect Sys-
tem pulse template requirement for E3. Consequent-
ly, the Transmit Line Build-Out circuit in a given Chan-
nel in the XRT73L02 is disabled whenever that chan-
nel has been configured to operate in the E3 Mode.
2.5
I
NTERFACING
THE
T
RANSMIT
S
ECTIONS
OF
THE
XRT73L02
TO
THE
L
INE
The E3, DS3 and SONET STS-1 specification docu-
ments all state that line signals transmitted over coax-
ial cable are to be terminated with 75 Ohm resistor.
Interface the Transmit Section of the XRT73L02 in
the manner illustrated in Figure 14 to accomplish this.
COMMAND REGISTER CR1-(N)
D4
D3
D2
D1
D0
TxOFF_(n)
TAOS_(n)
TxClkINV_(n)
TxLEV_(n)
TxBin_(n)
0
X
X
1
X
F
IGURE
14. R
ECOMMENDED
S
CHEMATIC
FOR
I
NTERFACING
THE
T
RANSMIT
S
ECTION
OF
THE
XRT73L02
TO
THE
L
INE
R1
31.6
R2
31.6
Channel (n)
TxPOS_(n)
TxNEG_(n)
TxLineClk_(n)
TTIP_(n)
TRing_(n)
TPData_(n)
TNData_(n)
TxClk_(n)
Only One Channel Shown
1:1
J1
BNC
相關(guān)PDF資料
PDF描述
XRT73L03A 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L03AIV 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L03B 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L03BIV 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04A 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT73L02M 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MES 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
XRT73L02MIV 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MIV-F 功能描述:外圍驅(qū)動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT73L02MIVTR-F 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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