TC3x Multiplexer User's Guide
TC3x_UG_01_V03.10 -
Released
Page 39/50
10.01.2002
8.3.5 Closedown
After the close down procedure both stations return to operation in the AT command mode.
The following options exists for the close down procedure:
-
Disconnect all DLCIs (DLCI Command); the last disconnection is for DLCI = 0
-
Multiplexer close down command (CLD). The multiplexer controls the closedown: all DLCIs are
first closed, finally DLCI = 0
8.3.6 Multiplexer control channel
DLCI = 0
The commands are sent as information in the Multiplexer control channel frame.
Type field:
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
EA
C/R
T1
T2
T3
T4
T5
T6
EA bit:
Extension bit.
In the last octet of the sequence the EA bit = 1, otherwise = 0.
If there is only on octet, EA bit = 1 is set.
C/R bit:
Indicates whether the sequence is a command or a response.
T-bits:
Coding of the command type.
Length field:
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
EA
L1
L2
L3
L4
L5
L6
L7
EA bit:
Extension bit.
In the last octet of the sequence the EA bit = 1, otherwise = 0.
If there is only one octet, EA bit = 1 is set.
L-bits:
Number of value octets; the following L1 is the LSB, L7 the MSB.
Multiple commands can be sent in a frame. Commands are not permitted to be distributed over more
than one frame.
8.3.6.1 Multiplexer close down (CLD)
Type field:
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
1
C/R
0
0
0
0
1
1
Length byte = 0, no value octet
Figure 22: Multiplexer control channel
Type
1 Octet
Length
n Octets
Value 1
1 Octet
Value 2
1 Octet
.....
Value n
1 Octet
Information Field
