Configuring The Sliding Window Size On An Isdn Pri Interface; Displaying And Maintaining Isdn Settings - HP MSR Router Series Wan Access Configuration Manual

When sending a frame, Q.921 checks the number of unacknowledged frames. For example, V(A) is the
sequence number of the previous acknowledged frame, V(S) is the sequence number of the frame to be
sent, and k is the sliding window size. If V(A) + k = V(S), the system stops sending frames.
To configure the sliding window size on an ISDN BRI interface:
Step
1. Enter system view.
2. Enter ISDN BRI interface view.
3. Configure the sliding window
size.

Configuring the sliding window size on an ISDN PRI interface

Q.921 sends frames in order of their sequence numbers and requires an acknowledgment of each
transmitted frame. To improve transmission efficiency, Q.921 does not wait for a transmitted frame to be
acknowledged before it sends the next frame. Instead, it uses a sliding window mechanism for
transmission.
The sliding window mechanism enables Q.921 to send multiple continuous frames without waiting for
the acknowledgment of the previous frame. The sliding window size sets the maximum number of
unacknowledged frames. You can tune the size depending on the link status to maximize the throughput.
When sending a frame, Q.921 checks the number of unacknowledged frames. Suppose V(A) is the
sequence number of the previous acknowledged frame, V(S) is the sequence number of the frame to be
sent, and k is the sliding window size. If V(A) + k = V(S), the system stops sending frames.
To configure the sliding window size on an ISDN PRI interface:
Step
1. Enter system view.
2. Enter ISDN PRI interface view.
3. Configure the sliding window
size.

Displaying and maintaining ISDN settings

Execute display commands in any view.
Task
Display information about successful
Q.931 calls on ISDN interfaces.
Display information about calls on
ISDN interfaces.
Display ISDN call history records.
Command
system-view
interface bri interface-number
isdn bri-slipwnd-size window-size
Command
system-view
interface interface-type
interface-number
isdn pri-slipwnd-size window-size
Command
display isdn active-channel [ interface interface-type
interface-number ]
display isdn call-info [ interface interface-type interface-number ]
display isdn call-record [ interface interface-type interface-number ]
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Remarks
N/A
N/A
The default window size is 1.
Remarks
N/A
N/A
The default window size is 7.