SONET/SDH OC-3/12 TRANSMITTER AND RECEIVER
S3005/S3006
STS-12/STS-3 OPTICAL INTERFACE
receive and transmit overhead processors on the
equipment side and electrical-to-optical converters
on the line side to realize the core of a typical
SONET transceiver.
The S3005 and S3006 devices are designed to in-
terface seamlessly to make a SONET transceiver for
STS-12, CMI-encoded STS-3, and STS-3. Figure 20
shows these two devices connected together with
Figure 20. OC-12 Application
77.74 MHz
TX Overhead
500Ω
REFCLK
OC-12
TX
PCLK
STS-3
POUT[7:0]
TX
PIN[7:0]
PICLK
LLD
TSD
POCLK
E/O
TSCLK
LLCLK
DLD
S3005
S3006
MODE2
SYNC
PAE
TO/FROM
COMMON
CONTROL
STTX
DLEB
LLEB
STS-3
RX
REFCLK
LLCLK
OC-12
RX
DLD
RSD
LOS
LLD
PIN[7:0]
PICLK
FPIN
POUT[7:0]
O/E
POCLK
FP
OOF
OOF
500Ω
RX Overhead
TESTEN = LOW
REFSEL[1] = HIGH
REFSEL[0] = HIGH
MODE[2] = CONNECTED to LLEB
MODE[1] = LOW
MODE[0] = LOW
STS-3 CMI ELECTRICAL INTERFACE
With the S3006 devices optioned for CMI-coded
STS-3, an electrical SONET transceiver can be
implemented as shown in Figure 21 In this case, a
clock reference of 51.84 MHz was selected. TSD
would be coupled through a line driver and trans-
former to a coaxial cable for short span applications.
Figure 21. CMI Electrical Interface
51.84 MHz
TX Overhead
REFCLK
PCLK
TSD
STS-1
TX
PIN[7:0]
PICLK
LLD
POUT[7:0]
POCLK
S3005
DLD
LLCLK
SYNC
PAE
TO/FROM
COMMON
CONTROL
SLTX SSTX
DLEB
DCLV
LLEB
STS-1
RX
REFCLK
LLCLK
STS-3
CMI
RX
DLD
RSD
LLD
PIN[7:0]
PICLK
FPIN
POUT[7:0]
POCLK
S3006
FP
LCV
OOF
OOF
RX Overhead
MODE[2] = LOW REFSEL[1] = HIGH
TESTEN = LOW MODE[1] = LOW REFSEL[0] = LOW
MODE[0] = HIGH
Applied Micro Circuits Corporation
6195 Lusk Blvd., San Diego, CA 92121 • (619) 450-9333
26
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
