NPT-1020 Installation and Maintenance Manual
Connection Data
ECI Telecom Ltd. Proprietary
8-2
8.4
T3/T4 Timing Connector
The T3/T4 timing connector is an RJ-45 connector located on the NPT-1020 panel and designated T3/T4.
The interface includes a group of lines that are usually connected to the site timing reference distribution
subsystem:
Clock input (T3 2.048 Mbps or 2.048 MHz signal, ITU-T Rec. G.703 interface; T3 1.544 Mbps or 1.544
MHz signal, ITU-T Rec. G.703 interface)
Clock output (T4 2.048 Mbps or 2.048 MHz signal, ITU-T Rec. G.703 interface; 1.544 Mbps or 1.544
MHz signal, ITU-T Rec. G.703 interface)
The following figure identifies the connector pins, as seen when looking into the connector. The table lists
the pin assignment for the connector. It also lists the color of the wire connected to the corresponding pin
in the cables offered by ECI for connecting between the tributary connector and a distribution frame.
Figure
8-3: T3/T4 connector, pin identification
Table
8-1: T3/T4 connector, PIN identification
Pin
Name
Function
Direction
Wire color
1
CLK2MHZ_IN(A)
2.048/1.544 MHz clock
input
Input
Blue/White-ring
2
CLK2MHZ_IN(B)
Input
White/Blue-ring
3
CLK2MHZ_OUT(A)
2.048/1.544 MHz clock
output
Output
Green/White-ring
4
CLK2MHZ_OUT(B)
Output
White/Green-ring
5
CLK2MBIT_IN(A)
2.048/1.544 Mbps clock
input
Input
Brown/White-ring
6
CLK2MBIT_IN(B)
Input
White/Brown-ring
7
CLK2MBIT_OUT(A)
2.048/1.544 Mbps clock
output
Output
Orange/White-ring
8
CLK2MBIT_OUT(B)
Output
White/Orange-ring
