IBM 3270 manual Cable, Limits, Introduction3

Cable

Length

Limits

Table 2

shows the length limits of signal cable. To or

cables,

contact

your

IBM

Authorized

Dealer

or

IBM

Ma

Representative.

Table

2.

Signal Cable Length Limits

150

ohm

150

ohm

Shielded

Shielded

Telephone

Twisted-Pair

Twisted-Pair

Coaxial

Twisted-Pair

(22

AWG)

(26 AWG)

(RG62A/U)

Type 3

Red

Balun

both2000

ft

1333

ft

N/A

N/A

ends

(note

1)

Red

Balun

one

3280

ft

2186

ft

N/A

N/A

end (note

1)

DPC

both

ends

4920 ft

3333

ft

N/A

N/A

(note

2)

DPC-T3

both

N/A

N/A

N/A

Yes

(note

5)

ends

(note

3)

IBM/ROLM

N/A

N/A

N/A

Yes

(note

5)

Balun

both

ends

(note

4)

DPC-T3

N/A

N/A

N/A

Yes

(note

5)

IBM/ROLM

opposite

ends

Minimum

None

None

None

100

ft

Length

Maximum

See

above

See

above

4920

ft

900

ft

Length

1

Red Balun is

the

IBM

Coaxial

Balun

Assembly,

P/N

8642546

2

DPC

is

the

IBM

Dual

Purpose

Connector

Attachment Cable

(this

cable

withdrawn

from

marketing

and

is

shown here for

reference

purposes

o

3 DPC-T3 is

the

IBM

3270

Dual Purpose Connector-to-Twisted-Pair

(DPC-T3)

Adapter. (See IBMthe 3174

Site

Planning ,GuideGA23-0213)

4 See theIBM/ROLM Coax-to-Twisted-Pair Adapter Planning

and Installation

Guide, GA27-3722

5

The

telephone

twisted-pair

type

3

cable

length

must

be

between

and

maximum lengths.

Note:

In

this

book,

unless

otherwise

stated,

the

word

to

any

of

the

above

cable

types.

Section 1. Introduction3