Turbo PMAC Clipper Hardware Reference Manual
Connections and Software Setup
44
J12: Ethernet Communications Port
This connector is used to establish communication over Ethernet between the PC and the Turbo PMAC
Clipper. A crossover cable is required if you are going directly to the Clipper from the PC Ethernet card,
and not through a hub.
Delta Tau strongly recommends the use of RJ45 CAT5e or better shielded cable. Newer network cards
have the Auto-MDIX feature that eliminates the need for crossover cabling by performing an internal
crossover when a straight cable is detected during the auto-negotiation process. For older network cards,
one end of the link must perform media dependent interface (MDI) crossover (MDIX), so that the
transmitter on one end of the data link is connected to the receiver on the other end of the data link (a
crossover/patch cable is typically used). If an RJ45 hub is used, then a regular straight cable must be
implemented. Maximum length for Ethernet cable should not exceed 100m (330ft).
J13: USB Communications Port
This connector is used to establish USB (A-B type cable) communication between the host PC and the
Turbo PMAC Clipper. This type of USB cable can be purchased at any local electronics or computer
store. It may be ordered from Delta Tau as well.
Pin# Symbol Function
1
VCC
N.C
2
D-
Data-
3
D+
Data+
4
Gnd
GND
5
Shell
Shield
6
Shell
Shield
Caution
The electrical ground plane of the host PC connected through USB
must be at the same level as the Turbo PMAC Clipper. Ground loops
may result in ESD shocks causing the damage of the communication
processor on the Turbo PMAC Clipper.
Note
Use a shielded USB (category 6 or 7) cable. In noise sensitive
environment, install ferrite cores at both Clipper and PC side.
JP11: OPT-11 Shunt
Not present if OPT-11 is installed. For internal use only.
LED Indicators
D3:
This is a dual color LED. When this LED is green, it indicates that power is applied to the +5V input
when this LED is red, it indicates that the watchdog timer has tripped.
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