Telecommunications - BSC Traces

The following traces were taken Using a Telenex Autoscope tee'd in to a link

. . . . House

. terminal 3274 . ------ . . ------ ------

. - ---- . | | . . | | PW | |

. -/ +-| +-.---| 3006 +--..........--| 3010 +-------| Host |

. +---| +----| . +------| . . +------| | +------|

. . . . |

................... .......... ---+-----

| |

| our |

| tester |

+---------|

The trace is read as follows:

sync timestamp hex coding of

character | data on line

| | |

v v v

from 3010 to host - High BCD --> FFs314:58:5844772FF

low BCD --> FFy2 00FFDFF

from host to 3010 - High BCD --> FFFF FFFFFFF

low BCD --> FFFF FFFFFFF

-------------------


21 - Polling trace

This shows the situation where the host is polling but neither end has anything to send.


22 - Polling with data transfer - trace

This shows the host polling and this time the cluster controller has some text to send.

<---------- 3270 data stream --->

---------------------------------------------------------------

PAD SYN SYN | STX | CU | Dev | AID | cursor | SBA: | text | ETX | BCC |

'55' | | add | add | enter | address| |=help | | |

+-----+-----+-----+-------+--------+---------+------+-----+-----|

02 40 40 7D C8F4 11C7E8 AAAB


23 - Selection - trace

This time the host has some text to send to the cluster controller.

<---------- 3270 data stream --->

PAD SYN SYN STX ESC WRITE WCC SBA: start text.. ETX BCC
'55' command field
02 27 F1 C1 114A40 1D


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