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ASCII Hosts . . . . . . . . . . . .
2-13
Session Termination
2-13
Unconditional Disconnection
2-13
XON/XOFF Pacing ....
2-14
Receive XON/XOFF . . . . . . .
2-14
Transmit XON/XOFF . . . . . .
2-14
Receive Queue Pacing Threshold
2-15
Alert, Error, and EEIF Logs
2-16
Alert Log
. . . . . . . . . . . . .
2-16
Error Log
. . . . . . . . . . . . .
2-16
Extended Error Information Field (EEIF)
2-16
Timers and Time Stamps . . . . . . . .
2-17
3708 Relative Time Clock . . . . . .
2-17
Time Stamps and Error Log Entries
2-18
Hardware Interface Operation
2-19
Connector Pin Definitions
2-19
EIA 232C Definition ....
2-19
EIA 422A Definition ....
2-21
Interface Leads during Port Activation
2-21
Nonswitched Asynchronous Line Activation
2-21
Switched Line Activation - Not CDSTL .
2-22
Switched Line Activation - CDSTL
2-22
Asynchronous EIA 422A Line Activation .
2-23
SDLC Link Activation PRTS . . . . . . . .
2-23
SDLC Link Activation Controlled RTS ..
2-24
Asynchronous Line Operation - HDX Communication Facility - HDX
Control Unit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-25
Asynchronous Line Operation - FDX Communication Facility, PRTS,
HDX Control Unit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-26
Asynchronous Line Operation - FDX Communication Facility, PRTS,
Echoplex (FDX or HDX CU) . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
Asynchronous Line Operation - FDX Communication Facility PRTS -
FDX Control Unit
. . . . . . . . . .
2-28
Chapter 3. SDLC and SNA Communication
3-1
Helpful Publications .....
3-1
SDLC Transmission Frames
3-2
Normal Response Mode .
3-2
Normal Disconnect Mode
3-2
SDLC Station Address . .
3-3
Control Field
. . . . . . .
3-3
Supervisory Commands
3-3
Nonsequenced Commands and Responses
3-4
Information Field . . . . . . . . . . . . .
3-5
Sequence Error Recovery Procedures
3-5
Abort Function .....
3-5
SDLC Inactivity Time Out ....
3-6
How the Timer Works .....
3-6
Backing Up an SNA Host Link
3-7
SNA Sessions . . . . . . . . . . .
3-8
SSCP-PU Session . . . . . . .
3-8
SSCP-Secondary LU Session
3-8
PLU-SLU Session
. . . . . .
3-9
Initiating an LU-LU Session
3-9
Example of Establishing a Session
3-10
Terminating an LU-LU Session . .
3-12
X
IBM -3708 Description
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