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Cable Length Limits
| Table 2 shows the length limits of signal cable. To order these
| cables, contact your IBM Authorized Dealer or IBM Marketing
| Representative.
Table 2. Signal Cable Length Limits
150 ohm
Shielded
Twisted-Pair
(22 AWG)
150 ohm
Shielded
Twisted-Pair
(26 AWG)
Coaxial
(RG62A/U)
Telephone
Twisted-Pair
Type 3
Red Balun both
ends (note 1)
2000 ft 1333 ft N/A N/A
Red Balun one
end (note 1)
3280 ft 2186 ft N/A N/A
DPC both ends
(note 2)
4920 ft 3333 ft N/A N/A
DPC-T3 both
ends (note 3)
N/A N/A N/A Yes (note 5)
IBM/ROLM
Balun both
ends (note 4)
N/A N/A N/A Yes (note 5)
DPC-T3
IBM/ROLM
opposite ends
N/A N/A N/A Yes (note 5)
Minimum
Length
None None None 100 ft
Maximum
Length
See above See above 4920 ft 900 ft
1
Red Balun is the IBM Coaxial Balun Assembly, P/N 8642546
|
2
DPC is the IBM Dual Purpose Connector Attachment Cable (this cable has been
| withdrawn from marketing and is shown here for reference purposes only).
3
DPC-T3 is the IBM 3270 Dual Purpose Connector-to-Twisted-Pair
(DPC-T3) Adapter. (See the
IBM 3174 Site Planning Guide
, GA23-0213)
4
See the
IBM/ROLM Coax-to-Twisted-Pair Adapter Planning and Installation
Guide
, GA27-3722
5
The telephone twisted-pair type 3 cable length must be between the minimum
and maximum lengths.
Note: In this book, unless otherwise stated, the word “cable” refers
to any of the above cable types.
Section 1. Introduction 3