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參數(shù)資料
| 型號(hào)： | CA16 |
| 英文描述： | CA16-Type 2.5 Gbits/s DWDM Transponder with 16-Channel 155 Mbits/s Multiplexer/Demultiplexer |
| 中文描述： | CA16型2.5 Gb /秒的DWDM轉(zhuǎn)發(fā)器，16通道155 Mbits /秒復(fù)用器/解復(fù)用器 |
| 文件頁數(shù)： | 13/30頁 |
| 文件大?。?/td> | 464K |
| 代理商： | CA16 |
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13
Agere Systems Inc.
Advance Data Sheet
March 2001
CA16-Type 2.5 Gbits/s DWDM Transponder with
16-Channel 155 Mbits/s Multiplexer/Demultiplexer
Functional Description
(continued)
Loopback Modes
The
CA16-type transponder
is capable of operating in
either of two loopback modes: diagnostic loopback or
line loopback.
Line Loopback
When L
LOOP
is pulled low, the received serial data
stream and recovered 2488.32 MHz serial clock from
the optical receiver are connected directly to the serial
data and clock inputs of the optical transmitter. This
establishes a receive-to-transmit loopback at the serial
line rate.
Diagnostic Loopback
When D
LOOP
is pulled low, a loopback path is estab-
lished from the transmitter to the receiver. In this mode,
the serial data from the parallel-to-serial converter and
the transmit serial clock is looped back to the serial-to-
parallel converter and the frame and byte detect cir-
cuitry, respectively.
Transponder Interfacing
The TxD[0:15]P/N, TxR
EF
C
LK
P/N, and PIC
LK
P/N
inputs and the RxQ[0:15]P/N, POC
LK
P/N, and PC
LK
P/
N outputs are high-speed (155 Mbits/s), LVPECL differ-
ential data and clock signals. To maintain optimum sig-
nal fidelity, these inputs and outputs must be
connected to their terminating devices via 50 con-
trolled-impedance transmission lines. The transmitter
inputs (TxD[0:15]P/N, TxR
EF
C
LK
P/N, and PIC
LK
P/N)
must be terminated as close as possible to the CA16
transponder connector with a Thevenin equivalent
impedance equal to 50
terminated to Vcc – 2 V. The
receiver outputs (RxQ[0:15]P/N, POC
LK
P/N, and
PC
LK
P/N) must be terminated as close as possible to
the device (IC) that these signals interface to with a
Thevenin equivalent impedance equal to 50
termi-
nated to Vcc – 2 V.
Figure 3, below, shows one example of the proper ter-
minations. Other methods may be used, provided they
meet the requirements stated above.
1-1054(F)
Figure 3. Transponder Interfacing
TxD[0:15]P
(LVPECL)
130
80
80
130
3.3 V
130
80
80
130
3.3 V
SONET/SDH
INTERFACE IC
RxLINE
TxLINE
50
IMPEDANCE
TRANSMISSION LINES
CA16-TYPE TRANSPONDER
50
IMPEDANCE
TRANSMISSION LINES
C
TxD[0:15]N
(LVPECL)
RxD[0:15]P
(LVPECL)
RxD[0:15]N
(LVPECL)
MUX
DEMUX
Tx
Rx
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