參數(shù)資料
型號(hào)： XRT73L03B
廠商： Exar Corporation
英文描述： 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
中文描述： 三通道DS3/E3/STS-1線路接口單元
文件頁數(shù)： 35/61頁
文件大小： 342K
代理商： XRT73L03B
XRT73L03B
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
33
Set the TxLEV_(n) bit-field to "1" as illustrated below.
2.4.3
Line Build-Out Circuit
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 outputs partially
shaped pulses onto the line via the TTIP_(n) and TRing_(n)
Design Guideline for Setting the Transmit
output pins. The cable loss that these pulses experience
over long cable lengths (e.g., greater than 225 feet) cause
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 within a given
Channel 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
XRT73L03B
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 XRT73L03B in
the manner illustrated in Figure 21.
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
21. R
ECOMMENDED
S
CHEMATIC
FOR
I
NTERFACING
THE
T
RANSMIT
S
ECTION
OF
THE
XRT73L03B
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
XRT73L03BIV 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04A 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04AIV 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04B 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
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XRT73L03IV 制造商:EXAR 制造商全稱:EXAR 功能描述:3 CHANNEL E3/DS3/STS-1 LINE INTERFCE UNIT
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