> 4.3.6 | Multiplexer Control Channel

> DLCI = 0
> Figure 11: Multiplexer control channel
> 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 single frame only.