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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)： | 35/62頁 |
| 文件大?。?/td> | 715K |
| 代理商： | XRT7302 |
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PRELIMINARY
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
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 requirements
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 XRT7302
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 com-
ply 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 XRT7302 is disabled whenever that channel
has been configured to operate in the E3 Mode.
2.5
I
NTERFACING
THE
T
RANSMIT
S
ECTIONS
OF
THE
XRT7302
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 XRT7302 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
XRT7302
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 |
|---|---|
| XRT73L02M | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L02MIV | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L02 | 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) |
| XRT73L03A | 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73L03AIV | 3 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 |
|---|---|
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| XRT73L00 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00A | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00AES | 功能描述:界面開發(fā)工具 Eval System for XRT73L00A Series RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XRT73L00AIV | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
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