7800 Multiframe Manual
7825DSK2-LG(-HD)(-3G) 3G/HD/SD Dual Downstream Keyer
Page 2-8
Revision 2.0
INSTALLATION
2.6. CONNECTING THE LINEAR TIME CODE
The 7825DSK2-LG(-HD)(-3G) has a linear time code (LTC) input used to provide time information for
the analog or digital clock logos. Connect the LTC output from your house master time code source to
the LTC IN XLR connector. When using an unbalanced input to the reader, the signal should be
applied to pin 3 of the reader input connector. Normally, the unused input (pin 2) should be connected
to ground (pin 1).
2.7. CONNECTING TO AN ETHERNET NETWORK
The 7825DSK2-LG(-HD)(-3G) 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
Ω
STP cable may be
used. When connecting for 100Base-TX systems, category 5 UTP cable is required. The cable must
be “straight through” with a RJ-45 connector at each end. Create a network connection by plugging
one end of the cable into the RJ-45 receptacle of the 7825DSK2-LG(-HD)(-3G) and the other end into
a port of the supporting network device.
The straight-through RJ-45 cable can be purchased or can be constructed using the pinout
information in Table 2-8. A colour code wiring table is provided in Table 2-8 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 2-8: Standard RJ45 Wiring Colour Codes
Note the following cabling information for this wiring guide:
•
Only two pairs of wires are used in the 8-pin RJ 45 connector to carry Ethernet signals.
•
Even though pins 4, 5, 7 and 8 are not used, it is mandatory that they be present in the cable.
•
10BaseT and 100BaseT use the same pins; a crossover cable made for one will also work with the
other.
•
Pairs may be solid colours and not have a stripe.
•
Category 5 cable must use Category 5 rated connectors.
The maximum cable run between the downstream keyer and the supporting hub is 300 ft (90 m). The
maximum combined cable run between any two end points (i.e. downstream keyer and PC/laptop via
network hub) is 675 feet (205 m).
