User`s manual
2000591-001 Troubleshooting •• 75
ANCB Description, Continued
Jumper J2 is a six-position header used to select the proper cable im-
pedance matching circuit for each ANCB DataNET port. Jumper J2 is
logically partitioned into two groups of three positions, see Figure 3-1.
There are two jumpers provided on J2. The lower jumper configures
Port1 and the upper configures Port2. Each jumper can be placed in one
of three positions, see Figure 3-1. The three positions match cable im-
pedance of 100, 120, and 150 ohms. If the characteristics of the cable
you are using are unknown check with the cable manufacturer for the
resistance setting. The manufacturer’s name is usually printed on the
cable cover. The Optichrom Data Hiway cable requires the 150-ohm set-
ting.
The ANG/DN consists of two ANCB boards. Each board provides either
the A or B channel network interface for one Data Hiway and one Data-
NET channel. Communications between the two boards is via the
Ethernet 10Base2(BNC) port. Jumper J5 selects the termination resistor
used for the 10Base2 port. Place the jumper on J5 between pins 1&2.
The pins farthest away from the 10Base2 connector (see Figure 3-1).
This selects the 50-Ohm termination resistor. The termination resistor
provides the proper end point termination resistance so that an external
termination resistor is not required.
See ANCB LEDs Description and Operation, page 76.
Jumper J2 Settings
Jumper J5 Setting
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