Circuit Pack Descriptions
Issue 8.0 July 2002
7-69
Quick Reference Summary 7
Transmit Functions 7
The IS3 (1.3 STD) circuit pack performs the following transmit functions:
a. Receives one IS-3 (155.52 Mb/s) non-return-to-zero (NRZ) SONET
compatible optical signal from a lightguide cross-connect panel (or
equivalent)
b. Converts the optical IS-3 signal to an electrical STS-3/3c signal
c. Recovers a 155.52 MHz clock signal from STS-3/3c signal and retimes the
STS-3/3c signal with the recovered clock
d. Descrambles and demultiplexes the STS-3/3c signal into three STS-1
signals (51.84 Mb/s)
e. Performs frequency adjustments and pointer processing on the three
STS-1 signals
f. Scrambles and multiplexes the three STS-1 signals to an STS-3/3c signal
(155.52 Mb/s)
g. Provides the STS-3/3c signal to an OC48 TRMTR circuit pack
h. Accepts the IS-3 SONET section DCC bytes from the TOHCTL circuit
pack.
Receive Functions 7
The IS3 (1.3 STD) circuit pack performs the following receive functions:
a. Receives an STS-3/3c signal (155.52 Mb/s) from an OC48 RCVR circuit
pack
b. Recovers a 155.52 MHz clock signal from STS-3/3c signal and retimes the
STS-3/3c signal with the recovered clock
c. Descrambles and demultiplexes the STS-3/3c signal into three STS-1
signals (51.84 Mb/s)
d. Performs frequency adjustments and pointer processing on the three
STS-1 signals
e. Scrambles and multiplexes the three STS-1 signals to an STS-3/3c signal
(155.52 Mb/s)
f. Converts the electrical STS-3/3c signal to an optical IS-3 signal
g. Provides the IS-3 optical signal to a lightguide cross-connect panel (or
equivalent).
h. Provides the IS-3 SONET section DCC bytes to the TOHCTL circuit pack.
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