R0106-HP MSR Router Series Layer 2 - WAN Command Reference(V7)

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Views
ISDN PRI interface view
Predefined user roles
network-admin
Parameters
window-size: Specifies a sliding window size in the range of 5 to 64.
Usage guidelines
Q.921 sends frames in order of their sequence numbers and requires an acknowledgement 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 acknowledgement 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.
Examples
# Set the sliding window size to 10 on the ISDN PRI interface Serial 2/3/0:15.
<Sysname> system-view
[Sysname] controller e1 2/3/0
[Sysname-E1 2/3/0] using ce1
[Sysname-E1 2/3/0] pri-set
[Sysname-E1 2/3/0] quit
[Sysname] interface serial 2/3/0:15
[Sysname-Serial2/3/0:15] isdn pri-slipwnd-size 10
Related commands
isdn bri-slipwnd-size
isdn progress-indicator
Use isdn progress-indicator to set the progress description in the progress indicator information element
of ISDN signaling messages.
Use undo isdn progress-indicator to restore the default.
Syntax
isdn progress-indicator indicator
undo isdn progress-indicator
Default
ISDN uses the progress description assigned by the upper-layer voice service.
Views
ISDN interface view