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LIB Type 7 (2400 bps Switched Network Integrated Modem with Automatic Call
Originate--IBM 3705 only). This LIB provides a single line set for the attach-
ment of one half-duplex synchronous switched line at 2400/1200 bps with
Automatic Call Originate (ACO). This line set includes an IBM 2,400 bps
integrated modem with automatic answering, automatic call originate (under
proper control), and automatic equalization. No external Modem or automatic
calling unit is required. LIB Type 7 is available only in the United States and
Canada.
Line Set 8A (1200 bps Leased Line Integrated Modem--IBM 3705 only). This
line set provides for the attachment or two synchronous leased lines at speeds up
to 1,200 bps. This line set includes two IBM 1,200 bps integrated modems. No
external modems are required.
Line Set 8B (1200 bps Switched Network Integrated Modem--IBM 3705 only).
This line set provides for attachment of two half-duplex synchronous switched
lines at speeds up to 1,200 bps. This line set includes two IBM 1,200 bps integrat-
ed modems with automatic answering. No external modems are required. Line
set 8B is available only in the United States and Canada.
Line Set 9A (1200 bps Switched Network Integrated Modem with Automatic CaU
Originate--IBM 3705 only). Line Set 9A provides for attachment of one half-
duplex synchronous switched line at speeds up to 1200 bps. This line set includes
an IBM Integrated Modem with automatic answering and automatic call origina-
tion. No external modem or automatic calling unit is required. Line Set 9A is
available only in the United States and Canada.
EIA RS-232C/CCITT V.24 Interface
The IBM 3704 and 3705 Communications Controllers provide an EIA Recom-
mended Standard 232C and CCITT Recommendation V.24 type interface for
attachment to external modems. The following list shows the interface lines that
are used by the IBM 3704 and 3705.
Pin
Number
2
3
4
5
6
7
8
14
15
17
EIA/CCITT
Circuit
BA/103
BB/104
CA/105
CB/106
CC/107
AB/102
CF/109
Special**
DB/114
DD/115
Line Description
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Received Line Signal
Detector
New Sync
Transmitter Signal
Element Timing
Receiver Signal Element
Line Set
IA
or
1 B 1
D or
1 H
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
OPT
N/A
N/A
OPT
OPT
OPT
Timing
N/ A
OPT
18
Special**
Modem Wrap (Local Test)
N/ A
OPT
20
CD/ 108 *
Data Terminal Ready
STD
STD
22
CE/125
Ring Indicator
N/ A
OPT
23
CH/ 111
Data Signal Rate Selector
N /A
OPT
*Circuit CD/108 is available in the Connect-Data-Set-to-Line option (CCITT
108.1) or the Data-Terminal-Ready (CCITT 108.2) option. Connect Data Set to
Communication Interfaces 5
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