HP MSR2000/3000/4000 Router Series Layer 2 - WAN Configuration Guide
69
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter ISDN BRI or PRI
interface view.
interface interface-type interface-number N/A
3. Configure the interface to
send the calling number
during an outgoing call.
isdn calling calling-number
By default, no calling number
is sent.
Configuring operation parameters of ISDN Q.931
protocols
Configuring the sliding window size on an ISDN BRI
Frames in the Q.921 buffer are sent in sequence. A frame can be sent only when the previous frame is
acknowledged.
To improve transmission efficiency, the sliding window mechanism is introduced. It allows the system to
send multiple continuous frames without having to wait for the acknowledgement to the previous frame.
The sliding window size determines the maximum number of unacknowledged frames.
When sending a frame, the system 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.
By default, the sliding window size of an ISDN BRI is 1. You can tune the size depending on the link status
to maximize the throughput.
To configure the sliding window size on an ISDN BRI:
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 on the ISDN BRI.
isdn bri-slipwnd-size window-size
Optional.
The default is 1.
Configuring the sliding window size on an ISDN PRI
Frames in the Q.921 buffer are sent in sequence. A frame can be sent only when the previous frame is
acknowledged. To improve transmission efficiency, the sliding window mechanism is introduced. It
allows the system to send multiple continuous frames without having to wait for the acknowledgement to
the previous frame.
The sliding window size determines the maximum number of unacknowledged frames. When sending a
frame, the system 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.