-TPB Twisted-Pair Bus
Like the -CXB transceiver, a hub
-
less cabling segment is possible. The
-TPB transceiver allows a total of eight -TPB NIMs to share a common bus
segment for up to 400 feet. These types of segments can be expanded using
the QL-TPS. Only connect this bus segment at the end of a segment. Do
not connect the hub to the middle of a segment since the hub port is not of
the high-impedance type. Do not terminate the end which attaches to the
hub port since a -TPS port effectively terminates the ends of a bus segment.
Simply remove the terminator from the segment end and attach the cable
directly to the hub port. The opposite segment end still requires termination
if no hub connection is being made.
Issue: the -TPS incorporates built-in BALUNs requiring a phase reversal of
the signals from the -TPB port. Therefore, the use of inverting cable is
required.
Figure 6
—
A -TPB segment can be expanded using -TPS ports on a hub.
Wiring Chart
RJ-11 Connector
PIN
-TPS
-TPB
1
–
–
2
N/C
N/C
3
LINE+
LINE–
4
LINE–
LINE+
5
N/C
N/C
6
–
–
Electromagnetic Compatibility
The QL series complies with Class A radiated and conducted emissions as
defined by CFR
47
, Part 15 and EN55022. This equipment is intended for
use in non-residential areas.
Warning
This is a Class A product as defined in EN55022. In a domestic
environment this product may cause radio interference in which case
the user may be required to take adequate measures.
TD990300-0I
F
6