Specifications

Token Ring Desing Considerations
RADring
Installation & Operation Manual
6-4 Token Ring Physical Design 3/11/98 12:26
Table 6-1 IBM Cabling System
Cable
Types
Description Attenuation (dB/Km) NEXT@
16 MHz
Application
4 Mbps 16 Mbps
TYPE 1
Data Cable
Two shielded twisted
pairs of non-plenum
AWG 22 solid copper
conductors (plenum)
22 45 -40 dB Main ring path.
Long lobes
TYPE 2
Data and
Telephone
Cables
Two shielded twisted
pairs same as type 1,
plus four voice grade
pairs AWG 22
22 45 -40 dB Main ring path, long lobe
cables, RS-232 data up to
19.2 kbps.
Voice grade pairs may be
used for connecting TADnet
token ring management
system.
TYPE 3
Telephone
Twisted
Pair
Four telephone
twisted pairs of AWG
24
50 100 -23 dB Used for connection of
workstation to wall faceplate.
Requires Type 3 media
Filter for use with token
ring.
TYPE 5
Fiber Optic
Cable
Two multi-mode
optical fibers in three
grades: 50/100,
62.5/125, 100/140
3
4
6
3
4
5
None Main ring path between
TAU/MAUs. Also for
16 Mbps backbones
TYPE 6
Patch Cord
Cable
Four twisted pairs of
AWG 26 with braided
shield
33 66 -34 dB Patch cable for wiring
closets and connection of
repeaters to the Ring-In,
Ring Out ports of
TAU/MAU.
Same characteristic
impedance as Type 1.
TYPE 8 Two shielded twisted
pairs of AWG 26
parallel with braided
shield
Flat cable for use under
carpet.
TYPE 9
Low Cost
Data Cable
Two shielded twisted
pairs of AWG 26 with
copper conductors
33 66 -34 dB Same application as Type 1.
Physically more flexible
than Type 1 but has higher
attenuation.
Main paths (plenum).