X25AM Configuration and Management Manual

Attribute Descriptions
X25AM Configuration and Management Manual—523424-004
5-13
PVC
The protocol you select affects the DEVTTPE attribute for a subdevice. For the
DEVTYPE value for each protocol, see Table 5-1 on page 5-6.
PVC
specifies the channel number of the permanent virtual circuit (PVC) with which the SU
is bound. This value must be within the current range limits defined by PVCRANGE for
the line. RESET means to delete any existing PVC assignment. The range is 1 through
4095 or 0 through 4095 (TRANSPAC). The default specification is no PVCs.
Subdevices are configured as SVCs by default when you configure your system. Use
the ALTER SU command to specify a subdevice as a PVC.
PVCRANGE
alters the range of logical channels to use for a PVC. Each integer of the pair must
have a value in the range 1 through 4095, except for TRANSPAC, in which the range is
0 through 4095. Also, the first integer must be less than or equal to the second integer.
RESET deletes any existing PVCRANGE assignment.
Although 1 through 4095 is the possible range for the number of circuits, you cannot
effectively use 4095 circuits because the actual usable number is the number of
circuits to which you subscribe. This includes the total of PVCs plus SVCs.
The actual range of allowable circuits is 1 through 510.
Table 5-2. X25AM Protocols and Connectivity
ITI Remote asynchronous terminals to NonStop S-series server using
Packet Switched Data Network (PSDN)
NAM Links Expand nodes with X.25 circuits
PTP Other hosts, local area networks (LANs), or local asynchronous
terminals using PSDN
QLLC Link-level protocol used as an X.25 interface for attaching SNA
devices to packet-switched data networks (SNAX)
Default: None
Range: 1 through 4095 or 0 through 4095 (TRANSPAC)
Objects: Subdevices
Default: None
Range: 1 through 4095 for each integer of the pair
Objects: Lines