Installation; Current Requirements; Channel Address Switch - HP 30242 Installation And Service Manual

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This section contains information on installing and verifying proper operation of the LANIC card, part
number 30242-60001. This manual assumes that the coaxial cable medium, tap, and l\1AU have been
installed and that the AUI cable has been connected to the MAD and has been routed from the MAU to
the host computer system containing the LANIC. Information on installing the MAU and the AUI cable
is contained in the
Local Area Network Cabling and Installation Guide, part nwnber 30242-90002.
[ CAUTION
I
SOME OF THE COl\lPONENTS USED IN THIS PRODUCT ARE
SUSCEPTIBLE TO DAMAGE BY STATIC DISCHARGE. REFER TO THE
SAFETY CONSIDERATIONS INFORl\lATION AT THE FRONT OF THIS
MANUAL BEFORE HANDLING THE CARD.
CURRENT REQUIREMENTS
The LANIC circuit card obtains its operating voltages from the host computer. The current requirements
of the card are listed in the power requirements entry of table 1-1.
All HP 3000 Computer systems can supply adequate current to accomodate the LANIC card without the
need for any power supply modification. However, it is possible that the + 12V supply in the HP 3000
system may be set to a low voltage such that the VP lead on the AUI cable may not provide the minimum
voltage specified by IEEE 802; 3
(+
11. 28V). If MAU replacement does not correct an apparent MAU
problem, the VP voltage should be checked. This is done by connecting an accurate voltmeter between
the + 12 and GND test points near the LEDs on the LANIC card. This must be done when the MAU is
connected to the LANIC and MAU power is on (as indicated by the VP LED). MAU power can be turned
on by executing the LANIC self -test. Consult the HP 3000 CE Handbook for instructions on adjusting
the + 12V power on the HP 3000.
CHANNEL ADDRESS SWITCH
For the LANIC card, the channel address is set by a CHAN ADDR rotary switch, SW2, located on the
front edge of the card. See figure 2-1 for the location of SW2. SW2 can be set to any value between 1
and 1 5, however, ensure that no GICs, ADCCs, or SIBs are set to the same channel number. Once you
have set SW2 to a value, jot the value down. For 3x and 4x systems, this value times 8 will be the DRT
number. For 6x systems, the DRT number is computed as follows: (CHAN ADDR
x
8) + (1MB x 128)
=
DRT.
Update 1 (July 1986)
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