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

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[Sysname] interface bri 2/4/0
[Sysname-Bri2/4/0] isdn bch-select-way descending
Related commands
isdn bch-local-manage
isdn bri-slipwnd-size
Use isdn bri-slipwnd-size to set the sliding window size on an ISDN BRI interface.
Use undo isdn bri-slipwnd-size to restore the default.
Syntax
isdn bri-slipwnd-size window-size
undo isdn bri-slipwnd-size
Default
The sliding window size is 1 on an ISDN BRI interface.
Views
ISDN BRI interface view
Predefined user roles
network-admin
Parameters
window-size: Specifies a sliding window size in the range of 1 to 7.
Usage guidelines
Q.921 sends frames in order of their sequence numbers and requires an acknowledgement of each
transmitted frame. 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 7 on BRI 2/4/0.
<Sysname> system-view
[Sysname] interface bri 2/4/0
[Sysname-Bri2/4/0] isdn bri-slipwnd-size 7
Related commands
isdn pri-slipwnd-size
isdn caller-number
Use isdn caller-number to configure calling number verification for incoming calls.
Use undo isdn caller-number to restore the default.