HP MSR Router Series User Manual

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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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter ISDN BRI interface view.
interface bri interface-number N/A
3. Configure the sliding window
size.
isdn bri-slipwnd-size window-size
The default window size is 1.
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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter ISDN PRI interface view.
interface interface-type
interface-number
N/A
3. Configure the sliding window
size.
isdn pri-slipwnd-size window-size
The default window size is 7.
Displaying and maintaining ISDN settings
Execute display commands in any view.
Task Command
Display information about successful
Q.931 calls on ISDN interfaces.
display isdn active-channel [ interface interface-type
interface-number ]
Display information about calls on
ISDN interfaces.
display isdn call-info [ interface interface-type interface-number ]
Display ISDN call history records. display isdn call-record [ interface interface-type interface-number ]

HP MSR Router Series Specifications

General

Brand	HP
Model	MSR Router Series
Category	Network Router
Language	English