3028 Turbo Statistical Multiplexer
I-24
154001UA
CHANNEL ST
CHANNEL ST
CHANNEL ST
CHANNEL ST
CHANNEL STA
A
A
A
ATUS
TUS
TUS
TUS
TUS
(CHNL ST
(CHNL ST
(CHNL ST
(CHNL ST
(CHNL STA
A
A
A
ATUS)
TUS)
TUS)
TUS)
TUS)
All Channel status functions remain valid except that Reverse Flow Control will
not be displayed since it does not apply for SDLC/HDLC channels.
Note
Supervisory access, both local and remote, is
restricted to asynchronous channels.
GENERAL SYSTEM
GENERAL SYSTEM
GENERAL SYSTEM
GENERAL SYSTEM
GENERAL SYSTEM
REQUIREMENTS
REQUIREMENTS
REQUIREMENTS
REQUIREMENTS
REQUIREMENTS
The requirements for asynchronous channels as described in the Channel Type
section apply for SDLC/HDLC channels.
Cyclic Redundancy
Cyclic Redundancy
Cyclic Redundancy
Cyclic Redundancy
Cyclic Redundancy
Check
Check
Check
Check
Check
The CRC-CCITT polynomial X
16
+X
12
+X
5
+1 is used for generating the frame check
sequence characters in each frame.
Frame Abort
Frame Abort
Frame Abort
Frame Abort
Frame Abort
The multiplexer recognizes the occurrence of 7 consecutive 1 bits within an
incoming SDLC/HDLC frame as an abort, and the multiplexer will discard all
further input on that channel until an opening flag is recognized. The abort is
propagated to the remote DTE as 7 to 13 one (1) bits.
Erroneous CRC
Erroneous CRC
Erroneous CRC
Erroneous CRC
Erroneous CRC
If a CRC error occurs on a frame received on an SDLC/HDLC channel, the condi-
tion is propagated to the remote multiplexer where a bad CRC is generated into the
outgoing frame on the appropriate channel.