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6 Frame Relay
6.1.2 DLCI-areas when the 2-Byte-Address array is used
(ITU Q.922)
Table 5 lists the allocation of the DLCI numbers on use of the 2-
Byte-address array.
DLCI-area Meaning
0 Signalizing in the transmission channel, if necessary
1 – 15 Reserved
16 – 511
Network option: on not-D channels, usable for the support of user
information
512 - 991
logical connecting identifier for the support of user information (the
use of semi permanent connections can reduce the DLCI numbers
available within this area)
992 - 1007 Layer 2-Management of Frame-transport services
1008 reserved
1023
Layer 2-Management in the transmission channel if necessary (only
usable without d-channel)
Table 5 DLCI allocation in connection with 2-Byte-
address array
DLCI Range 10 9 8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0 0 0 0
1 - 0 0 0 0 0 0 0 0 0 1
15 0 0 0 0 0 0 1 1 1 1
16 - 0 0 0 0 1 0 0 0 0 0
511 0 1 1 1 1 1 1 1 1 1
512 - 1 0 0 0 0 0 0 0 0 0
911 1 1 1 1 0 1 1 1 1 1
992 - 1 1 1 1 1 0 0 0 0 0
1007 1 1 1 1 1 0 1 1 1 1
1008 - 1 1 1 1 1 1 0 0 0 0
1022 1 1 1 1 1 1 1 1 1 0
1023 1 1 1 1 1 1 1 1 1 1
Table 6 bit sequence for different DLCI identifiers