Network Infrastructure - Yamaha ACU16-C Manual

1 CobraNet
N
NHB32-C
Connecting two Ethernet devices using a crossover Ethernet cable
NHB32-C
ACU16-C
A switched network
CobraNet—the Technical Stuff
etwork Infrastructure
Since CobraNet is designed to work on industry-standard 100Base-T Ethernet networks, it
has no special requirements and a suitable network can easily be constructed by using readily
available 100Base-T Ethernet-compatible equipment, switches, cables, and so on.
The theoretical maximum cable length for 100Base-T Ethernet over CAT5 copper cables is 100
meters. However, because of cable quality and environmental considerations (i.e., interfer-
ence), sometimes this cannot be realized. About 70 to 80 meters is a safe maximum. Always
use high-quality shielded CAT5 cables (cables that use all 8 pins, RS-485 spec). The maximum
distance for multimode fiber optic cables is 2 kilometers.
In the world of Ethernet networking, two devices can be connected directly together using
what's known as a crossover
are crossed at one end).
To connect three or more devices requires a hub. There are two types of Ethernet hub:
hub and switching hub, or
Networks made up of switches are called switched networks. A switch knows the network
addresses of all the devices on the network. When it receives data packets, it checks the desti-
nation address and outputs the data to the port to which the correspondingly addressed device
is connected. This is an efficient use of the available network bandwidth, hence switched net-
works support up to 128 channels per connection, as opposed to the 64 channels net-
work-wide supported by repeater networks.
Straight cables (wired pin-to-pin) should be used to connect the ACU16-C, NHB32-C, and
other network devices to a switch.
Ethernet cable (i.e., a cable whose data transmit and receive lines
Crossover
NHB32-C
Ethernet cable
switch for short. Switches are recommended for CobraNet networks.
NHB32-C
Switch
Ethernet cables
ACU16-C
CobraNet, ACU16-C & NHB32-C Guide
All straight
repeater
8