Specifications

TOKEN RING NETWORK CABLING
4-2
TERMINOLOGY
This section covers some of the basic terminology used in reference to
Token Ring cabling concepts.
Attentuation
Attenuation is the loss of signal strength in a cabling system. It is typically
expressed in dB per unit lengths.
The attenuation of PVC insulated cable varies significantly with
temperature. At temperatures greater than 40°C, we strongly recommend
that you use plenum-rated cables to ensure that cable attenuation remains
within specification. Check the cable manufacturer’s specifications.
Crosstalk
Crosstalk is interference caused by signals from one circuit or cable
integrating with signals from another adjacent circuit or cable. Crosstalk is
often caused by signal coupling between different cable pairs contained
within a multi-pair cable bundle.
DB Connector
A DB, or Data Bus, connector is used to connect serial cable to a
data-transport bus. DB connectors used for Token Ring implementation
include the 9-pin DB9 connector and the 25-pin DB25 connector.
Drive Distance
Drive distance is the limit of reliable signal propagation specified for each
media type.
Impedance
Impedance is the opposition that circuit or cabling presents to a current, or
data signal, at a specific frequency.
Lobe Cabling
Lobe cabling is used to connect Token Ring stations to the ring trunk cable
path (main or back-up). It includes all work area cabling, horizontal
cabling, and patch cables.
Lobe Port
A lobe port is a port on a Token Ring concentrator used for connecting a
lobe cable connector to the concentrator.
Noise
Noise is the migration of intrusive and unwanted signals originating from
an extraneous source to a circuit or cable.