World Trade Common-Carrier Private Line Tele­ graph Circuits 70 1. World Trade Single Current Line Set (#2829)
allows direct attachment of 40ma, 2 wire,
single-current telegraph circuits at 50 or 75
bps.
2. World Trade Double-Current Line Set (#2831)
allows attachment of 2 or 4 wire double­
current telegraph circuits at 50,75, or 100 bps via IBM 3945 Model 11 Telegraph Line
Termination. PRI\'ATELY OWNED COMMUNICATIONS FACILITIES
The privately owned communications facility must
be equivalent to one of the previously described
common-carrier facilities. If the facility conforms
to the SRL manual A24-3435** specifications for
Limited-Distance Line Adapter Type 1, IBM Line Set 1A or 1B (#4686 or '#4687) may be used; for
Limited-Distance Line Adapter Type 2, IBM Line Set 2 (#4688) may be used in place of data sets.

Address Assignment Considerations 13
Address Boundaries 13
Address Range 13
Addressing Characters 23
All Zeros (Normal) 29
Assemble/ Disassemble Field 16
Attached Communication Lines 5
Attention Key (2741) 45
Auto-Call Feature 21
Automatic Answering 21
Automatic Wraparound 15
Base Expansion Feature 36
bcc (Block-Check Character) 48
Binary Synchronous Commands 55
Bit Count 16
Break 25
BSC (Binary Synchronous Communications) Capabilities 47 BSC Special Features 51
Bus Out Check (2-Bit), Sense Byte 31
Busy, Status Modifier, and Control Unit End 29
CAW (Channel Address Word) 11
CB Light 65
CC (Chain Command) 15
CCW (Channel Command Word) 11
CD (Chain Data Flag) 15
CE Test Light 65
Channel Attachment Restrictions 14
Channel End and Device!:.nd 29
Channel End, Device End, and Status Modifier
Channel End, Device End, and Unit Check 30 Channel End, Device End, and Unit Exception 30 30 Channel End, Device End, Unit Exception, and Unit Check
Character Address 16
Character Recognition Summary 41, 42, 43
Command 18
Command Reject (O-Bit), Sense Byte 31, 32, 33, 34
Commands, Start/ Stop 25, 26
Common-Carrier Leased Private-Line Telegraph Service 69
Common-Carrier Leased Pri vate-Line Telephone Service 68
Common-Carrier-Provided Facilities 68
Common-Carrier Switched Telephone Network 68
Common-Carrier Switched Teletypewriter Exchange (TWX)
Networks 68
Common Controls and Storage (General) 7
Communication Facilities 68
Communications Line Addressing 12
Control Signals 23
Control-Type Commands 28
Control Unit Busy 29
CRC 53 CSW (Channel Status Word) 11
Data 19
Data Byte 19
Data Check (4-Bit), Sense Byte 32, 33, 34
Data Communication Units 5, 6
Data Line Set 36
Data Line Set Expander 36
Data Service 18 30 Data Set (Modem) Features 54
Detailed Descriptbn of Operations 11
Dial 27
Dial Digits 21
Disable 28
DLE 49 OLE-Stick 49
INDEX EBCDIC--:Extended Binary-Coded-Decimal Interchange Code 51
Effect of Halt I/O Instruction and Zero Byte Count 62
Em (Error Index Byte) 16,49,50,56. Enable 28
End 18
End of Address @ --EOA 24
End of Block ® -- EOB 24
End of Transmission © --EOT 24
Ending Status Conditions 29
ENQ 49 EOT 50 EOT and NA K 48
Equipment Check (3-Bit), Sense Byte 31
ETB and ETX 48, 49
Exception Commands 28
Feature Limitations per 2703 (Sununary) 20 FIGS (Figures Shift) 43, 44
Flags, Command 15
General (Both Start I Stop and BSC) Special Features 19
General Description of BSC Operations 47
General Description of 2703 Operations 7
Halt I/O 14
Halt I/O Instruction (Synchronous) 63
HaIti Stack 18
High Address Boundary 13
IBM (Intermediate Block Mode) 18
IBM Line Set lA 36
IBM Line Set IB 36
IBM Line Set 2 36
IBM Terminal Control Base 35
IBM Terminal Control Type I 35
IBM Terminal Control Type I (Detailed) 39
IBM Terminal Control Type II 35
IBM Terminal Control Type II (Detailed) 42
IBM 2711 Line Adapter Unit 9
IBM 2712, Typical Configuration 38
IBM 2712 Remote Multiplexer 9
Indicators 65
Inhibit 27
Initial Status Conditions 29
Inquiry @ --Positive Answer 24
Internal Organization 8
Interrupt Feature, Type I Terminal 19, 35, 45
Intervention Required (1-Bit), Sense Byte 32, 33, 34
Introduction to BSC 47 I/O Character Count 19 I/O Instructions 14
II 0 Interface Controls 7 I/O No-Op 28
ITB 48, 50 71