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Magnum 700X Mini-Concentrators Installation and User Guide (05/98)
GARRETT
9
to provide connectivity to any media type.
The RPM-AUI card is equipped with Partition (PART) and Receive (RX) LEDs which
function the same as the identical LEDs on the RPM-BNC (Section 2.3.1 above).
The Magnum RPM-AUI card is also used for connecting Ethernet devices using
standard AUI cabling. In this situation, it is important to consider the AUI segment length or
distance to the attached device.
The maximum transmission distance between a backbone transceiver equipped with an
AUI connector and the Magnum RPM-AUI card will vary. When an AUI cable is used to
connect the Magnum RPM-AUI directly to a backbone transceiver, the maximum AUI segment
length is allowed. If the Magnum RPM-AUI is connected to a transceiver that has been cascaded
from another transceiver, the maximum AUI segment length is reduced.
According to Ethernet standards, the maximum distance from the transceiver AUI
connector and the attached device (Magnum RPM-AUI) is 50m (165 ft.). The AUI segment
maximum length is reduced in cascaded configurations. See the following note.
Important Note:
The maximum transmission distance is decreased by 6m (20 ft.) for
every additional level of network transceiver device "dropped" or "cascaded" from the original
backbone transceiver tap.
The RPM-AUI connector supports standard IEEE signals, summarized in Table 2.3.2.
Table 2.3.2: AUI Pin Assignments
Pin Function Pin Function
1 Control In Circuit Shield 10 Data Out Circuit B
2 Control In Circuit A 11 Data Out Circuit Shield
3 Data Out Circuit A 12 Data In Circuit B
4 Data In Circuit Shield 13 Voltage Plus (+)
5 Data In Circuit A 14 Voltage Shield
6 Voltage Common 15 Control Out Circuit B
7 Control Out Circuit A SHELL Protective Ground
8 Control Out Circuit Shield (conductive shell)
9 Control In Circuit B
NOTES:
1) Voltage Plus (pin #13) and Voltage Common (pin # 6) use a single
twisted pair in the AUI cable.
2) Pins 4, 8, 11 and 14 may be connected to pin #1.