User manual HP, model HP NonStop G-Series

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manual abstract

Installing the AWAN Access Server
Cables and Adapters
Rack Mounting
Models 3884, 3884R, 3885, and 3885R are rack-mountable in a 19-inch rack. You must
use an open-frame style rack that has no side or front panels that might restrict
ventilation. The rack must be permanently secured in place to prevent instability. Rack
mounting hardware is available from Compaq as an option for these AWAN access
server models. Table 2-2 describes the rack mounting kits available from Compaq.
Table 2-2. Rack Mounting Kits
Description
Compaq Part Number
19-inch rack mounting kit for model 3884/3884R
U41619
19-inch rack mounting kit for model 3885/3885R
U41620
Note. When an AWAN access server is rack mounted, power connections should be made
directly to the AC branch circuit. Connection through any other device in the rack (such as a
power strip, power distribution unit (PDU), or uninterruptible power supply (UPS)) should not be
made without ensuring that the total system current limit is not exceeded.
Cables and Adapters
This subsection describes the cables used to connect an AWAN access server to an
Ethernet local area network (LAN) and the adapters and terminal cables used to connect
devices to an AWAN access server.
AUI Transceiver Cable
In the AUI configuration, devices are connected to the network through separate cables
attached to transceivers that tap into the central Ethernet cable. A single Ethernet cable
supports up to 100 transceiver taps. Adjacent transceiver taps must be spaced at intervals
no closer than 2.5 meters (8.2 feet).
The distance between the Ethernet transceiver and the AWAN access server is limited by
engineering standards to a distance of up to 50 meters (164 feet) from the Ethernet
transceiver. In practice, however, distances are usually limited to 40 meters (131.2 feet).
The 40-meter cable-length restriction applies to both single and multiport transceivers.
For multiport transceivers, the total cable length is the sum of the distance of the cable
that connects the Ethernet backbone to the multiport transceiver and the distance of the
cable that connects the multiport transceiver to the device.
Figure 2-1 shows a single Ethernet transceiver configuration and a multiport Ethernet
transceiver configuration. The single Ethernet transceiver tap is 40 meters (131.3 feet)
from the router. The multiport transceiver is 10 meters (32.8 feet) from the Ethernet
transceiver tap; thus, the unit must be no more than 30 meters (40 minus 10) from the
multiport transceiver. Each of the legs can extend up to 30 meters (98.4 feet).
Note. A minitransceiver can be connected to the AUI port to allow a thinwire (10Base2)
connection. A connection lock is provided for the AUI connector. The lock slides horizontally to
secure the connector.
AWAN 3883/4/5 Access Server Installation and Support Guide—424241-001
2 -3

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User manual HP, model HP NonStop G-Series

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