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Installing and Routing cables
8
Installing and Routing External Clock/Time Cables － Making External Time/Clock
Cables
The OptiX PTN equipment supports 75-ohm and 120-ohm external clock/time interfaces. Select a correct
clock/time cable according to the type of the clock/time interface on the opposite equipment. In the case of the
75-ohm external clock cable, use the bending SMB connector; in the case of the 120-ohm external clock cable,
use the RJ-45 connector.
The OptiX PTN equipment supports the clock bridging cables for converting one or two channels of 75-ohm
clock signals to one channel of 120-ohm clock signals. For a bridge cable, the SMB connector at the 75-ohm
end is made before delivery and the connector at the 120-ohm end needs to be made on site according to the
core connection table.
PIN
120-ohm
external clock
1
Rx negative of external
2
Rx positive of external
3
Not defined
4
Tx negative of external
5
Tx positive of external
6
7
Not defined
8
SMB
Interface
CLK/TOD
(1PPS/DCLS)
CLK/TOD
(Serial Info.)
75-ohm Cable
Core
Shielding layer
Pin of the CLK/TOD Interfaces on the TN82XCS Board
(1PPS + time information)
clock
clock
RS422 input/output negative of
clock
clock
RS422 input/output positive of
RS422 input/output negative of
RS422 input/output positive of
75-ohm
external clock
Interface for inputting the
external clock
Interface for outputting the
external clock
External time
Not defined
1PPS signals
Grounding
1PPS signals
time information
time information
External Time
(1PPS + Time Information)
RS422 input/output negative
of 1PPS signals
Time information
input/output interface
21
120-ohm Cable
Blue
White
External time
(DCLS)
Not defined
RS422 input/output negative of
DCLS time signals
Grounding
RS422 input/output positive of
DCLS time signals
Not defined
External Time
(DCLS)
RS422 input/output
negative of DCLS time
signals
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