GAI-Tronics LE300-IP Page/Party Line Extender - Manual (Page 37)

Pub. 42004-488C
M ODEL LE300-IP P AGE /P ARTY
®
L INE E XTENDER P AGE 34 of 68
e:\standard ioms - current release\42004 instr. manuals\42004-488c.doc
09/14
SmartSeries systems utilize FSK for communication on the page line between the stations and the Line
Extender. Since FSK frequencies range between 31 kHz and 33 kHz instead of audio frequencies, the
effects of longer cable lengths will present itself sooner. The higher frequency will lend to a greater
probability that standing waves of the FSK signal will be present. The cable length, in addition to the
number of cable branches present, will combine to determine the severity of these standing waves. Severe
standing waves present on the line can cause a portion of the system devices to be unable to properly
communicate with the Line Extender giving the need for distributing the line balance resistance.
Determining the cable resistance with any accuracy in installed systems is too difficult. Fortunately, the
resistance values to be installed can be determined without using the cable resistance in the calculation, as
precise accuracy is not necessary to achieve acceptable system functionality. The resistance values
installed should always calculate to a nominal parallel resistance of 33 ohms. One of the line balance
resistances can be the resistance included on the 69441-xxx terminal board, but it is not a requirement. It
will provide a resistance up to 115 ohms determined by the position of the potentiometer. Examples of
line balance resistances that could be installed are 51║100 ohms, 68║68 ohms or 100║100║100 ohms. It
is best to install the line balance resistors as far apart from one another in cable distance as possible.
Network Connections
Ethernet network connection to the LE300-IP Line Extender can be made using CAT 5e or CAT 6 copper
cable or fiber optic cable depending on the cable distance required. Each connection type is described
below. Refer to Figure 16–18 for network connections to the IPmux-24, which is mounted inside the
LE300-IP Line Extender.
Copper Cable Connections
Connect the LE300-IP Line Extender to the network Ethernet switch using CAT 5e or CAT 6 cable
terminated with an RJ-45 plug. The cable should be straight pinned following the EIA/TIA industry
standard for 568 A or B.
N OTE : Cable distance must be <100 meters.
CONTROL
EXT CLK
DCE
SD
NET
1
NET/USER
2
USER
3 1 2 3 4
LASER
CLASS
1
ETH E1/T1
SYNC SYNC SYNC SYNC
Figure 16. CAT5e or CAT 6 Cable Installation