HP X.25/9000 User's Guide HP-UX 11i v3 (5900-1523, August 2011)

Table 8 Permanent VC flow control field descriptions
DescriptionField
Maximum packet size to be used over a PVC. The range is 16 through 4096 octets.
The default is 128 for inbound and outbound packets. Use the value given on your
subscription form.
Packet Size: Inbound &
Outbound
Maximum number of packets that can be transmitted without acknowledgment over
a PVC. The range is 1 through 7 for Modulo-8, and 1 through 127 for Modulo-128.
Window Size: Inbound &
Outbound
(We recommend a value greater than 7 for Modulo-128). The default is 2 for inbound
and outbound transmission.
5. Click Modify Throughput Class Settings to modify Switched and Permanent VC throughput
class settings. The following dialog appears:
Figure 8 Modify X.25 throughput class defaults
6. Enter or modify field values as required (refer to the field descriptions below).
Table 9 Modify throughput class settings field descriptions
DescriptionField
CCITT class number. If Throughput Class negotiation is disabled, this value replaces
the Switched VC Negotiated field value. The range is 3 through 13 and the default
Switched VC Default:
Inbound and Outbound
is 11. See the table after these field descriptions listing the CCITT class numbers and
the corresponding line speed Baud rate. Use the value given on your subscription
form.
CCITT class number. If Throughput Class negotiation is enabled, this value is used
as the opening bid for outbound calls and as a counter offer when the inbound
Switched VC Negotiated:
Inbound and Outbound
opening bid is higher. The range is 3 through 13, and the default is 11. See the
table below for CCITT class numbers and corresponding line speed Baud rate. Use
the value given on your subscription form.
Table 10 Throughput classes and line speeds
Line speed Baud rate (bps)CCITT class number
753
1504
3005
6006
Configuring the X.25 link 21