Administering PAD, X.25, and Frame Relay
Administering PAD
MAX Administration Guide
8-5
Administering PAD
A Packet Assembler/Disassembler (PAD) is an asynchronous terminal concentrator that
enables several terminals (or other asynchronous devices) to share a single network line. In an
X.25/PAD configuration, PAD-generated packets are transported using the X.25 protocol. The
PAD assembles data from terminals into packets for transmission to an X.25 network and
disassembles incoming packets from the network into a separate data stream for each terminal.
In addition to this multiplexing function, the PAD also provides a nearly error-free connection.
The MAX unit’s X.25/PAD implementation allows users to access a public or private
packet-switched network over a nailed-up ISDN connection. When a user calls X.25/PAD
31
49
Incoming call (or DTE timer expired for call request)
32
50
Clear indication (or DTE timer expired or retransmis-
sion count surpassed for clear request)
33
51
Reset indication (or DTE timer expired or retransmis-
sion count surpassed for reset request)
34
52
Rstart indication (or DTE timer expired or retransmis-
sion count surpassed for restart request)
40
64
Call setup, call clearing, or registration problem
41
65
Facility/registration code not allowed
42
66
Facility parameter not allowed
43
67
Invalid called address
44
68
Invalid calling address
45
69
Invalid facility/registration length
46
70
Incoming call barred
47
71
No logical channel available
48
72
Call collision
49
73
Duplicate facility requested
4A
74
Nonzero address length
4B
75
Nonzero facility length
4C
76
Facility not provided when expected
Table 8-2. X.25 diagnostic field values (continued)
Hex
value
Dec
value
Diagnostic