Andrew ION-B Series, Руководство пользователя

Страница: 108 / 181

108 ION-B User Manual
TPRN
TPRN alarms
A full description of all TPRN alarms is provided by the Supervision System.
Table 4.1.5 provides a brief description of the TPRN alarms, as they are reported by the LMT
software.
Warning
(recommended for system designing and installing)
Providing correct heat dissipation
For correct use of the TPRN sub-rack, it is important to verify that:
• the system is designed for no more than 8 TFLNs inside a TPRN sub-rack. This guarantees
proper heating dissipation for the system. In case you want to install more than 8, it is
important to provide the sub-rack with a proper ventilation system;
• active and passive modules should be alternated as much as possible inside the TPRN
sub-rack avoiding too many active cards being inserted close together;
• in case the system consists of more than one TPRN sub-rack, a minimum distance of 1 HE
has to be kept between nearby TPRN sub-racks to ensure proper heat dissipation. The
rack containing the TPRN sub-racks has to be large enough to guarantee this correct
distance between master units.
Minimizing equipment costs
In order to reduce the cost of ION-B equipment, a multi-sub-rack system should be designed
according to the following guidelines:
• a passive sub-rack (TPRN04) may be used to house only passive modules;
• an active sub-rack (TPRN14, TPRN24, TPRN34) may be used to sustain all the active
modules, and some of the passive ones (as stated above, it is advisable to alternate
active and passive cards in an active sub-rack).
Setting the dip-switches in a multi sub-rack system
If you are installing a multi-sub-rack system, remember to assign each sub-rack an exclusive
binary address, by properly setting dip-switches 1,2,3,4 on the interior TPRN backplane (see Fig.
4.1.7 and Tab.4.1.3). Dip-switch 5 has to be set on each TPRN sub-rack in order to fi x the baud
rate for the RS485 and RS232 ports. Connecting the TPRNs through the RS485 port is necessary
when supervising the whole multi sub-rack system through the remote supervision unit (to be
set at the same baud rate).
The TPRN kit provides: