1275T / 1285T Series
Digital Clock Display
Page - 4
Revision 1.0
INSTALLATION
2.2.
CONNECTORS
The device comes with the ability to connect with other sources, in order to take time information, or
configure & control the wall clock itself. This section provides describes the connection options to the
device. The key sections are the following:
Time Code connections
Allows input and output connect connectivity to time codes.
Ethernet Connection
Allows operation and configuration of the device through a NMS (VL-PRO).
Serial Port connection
Allows configuration of the device through the RS-232 or Serial Port.
2.2.1. Time Code Connectors
There are two LTC IN and LTC OUT connections available in the rear of the device.
IN+, IN-
These two input pins are for connecting SMPTE/EBU longitudinal timecode
(LTC) to the clock.
OUT+, OUT-
These two input pins are for connecting SMPTE/EBU longitudinal timecode
(LTC) to the clock. They are a loop thru from the IN+ and IN- pins.
2.2.2. Ethernet Connections
The 1275T/1285T is designed to be used with either 10Base-T (10 Mbps) or 100Base-TX (100 Mbps)
also known as Fast Ethernet, twisted pair Ethernet cabling systems. When connecting for 10Base-T
systems, category 3, 4, or 5 UTP cable as well as EIA/TIA – 568 100
S TP ca b
connecting for 100Base-TX systems, category 5 UTP cable is required. The cable must be “straight
through” with a RJ-45 connector.
The straight-through RJ-45 cable can be purchased or can be constructed using the pinout information
in Figure 2-2. A colour code wiring table is provided in Figure 2-2 for the current RJ 45 standards
(AT&T 258A or EIA/TIA 258B colour coding shown). Also refer to the notes following the table for
additional wiring guide information.
Pin
1
Pin #
Signal
EIA/TIA 568A
AT&T 258A or
EIA/TIA 568B
10BaseT
or 100BaseT
1
Tr
White/Green
White/Orange
X
2
Transmit –
Green/White or White
Orange/White or Orange
X
3
R
White/Orange
White/Green
X
4
N/A
Blue/White or Blue
Blue/White or Blue
Not used (required)
5
N/A
White/Blue
White/Blue
Not used (required)
6
Receive –
Orange/White or Orange
Green/White or Green
X
7
N/A
White/Brown
White/Brown
Not used (required)
8
N/A
Brown/White or Brown
Brown/White or Brown
Not used (required)
Table 2-1: Standard RJ45 Wiring Colour Codes
