Multi Service Edge Device HL950
Administrator’s Guide
Page 33 (159)
EN/LZT 108 5995 R3
June
2003
4.2.3.4
X.21, V.35 and V.36 Unstructured CES with Adaptive Clocking
The following explains how to set up X.21/V.35/V.36 unstructured CES using adaptive clocking.
Figure 12
X.21, V.35 and V.36 Unstructured CES with Adaptive Clocking
When reading the example scenario, consider the following points:
!
Since adaptive clocking is used, you do not need a
set interface wan shdsl
ntrmode=ref8k
statement. However, you may choose to configure the buffer length to
prevent buffer overflow and underrun and, at the same time, control delay (greater buffer size
means greater delay). The buffer length is proportional to the maximum cell delay variation
(CDV), which you can configure with the
set ces atm name=abcd, jb
command.
The default values is 10 milliseconds. The measured value is displayed in the output of the
show ces atm name=abcd, jb
command.
!
In the figure above, Router1 provides the clock source to the ATM network.
!
Router2 is clocked from the Branch Office HL950 extracted adaptive clock.
!
PVC 0/40 is used between HL950 and DSLAM.
NOTE!
In this mode the regenerated clock is subject to network Cell Delay Variation and
may not comply with jitter and wander specifications.
The HL950
Headquarters
configuration (refer to
Figure 12
):
__________________________________________________________________________________
WIF 2x SHDSL Module Configuration:
HL950> set interface wan shdsl:ntrmode=local;
HL950> start interface wan shdsl
LIF E1 Module Configuration:
HL950> set interface line serial:cts=on, dsr=on, dcd=on, txcsrc=loop,
rxcsrc=rxc;
HL950> start interface line serial
ATM VCC Configuration:
HL950> add interface atm vcc:name=dslam, type=aal1, vcc=0/40, srvtype=cbr,
pcr=578000;
