Ericsson HL950 Administrator's Manual page 45

4.2.7.2 E1 Unstructured CES with Synchronous Clocking and Axerra Mode
The following explains how to set up E1 unstructured CES Axerra mode using synchronous clocking
with 10ms Jitter buffer.
E1 Unstructured CES with Synchronous Clocking and Axerra Mode
When reading the example scenario, consider the following:
Each HL950 derives clocking from its directly connected PABX. PABX1 and PABX2 are
!
both clocked from the same service provider. Most PABXs still connect to a telephone
network, which provides extremely stable and precise clocks. In many cases, the most stable
clocking configuration is to clock HL950 off the PABXs and allow the telephone network to
distribute an adequate clock source.
NOTE!
These clocks must be of equal accuracy and must be in phase.
The HL950 Headquarters configuration (refer to Figure 18):
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Ethernet Configuration:
HL950> set interface data ethernet:if=eth0, ip=10.1.10.1,
mask=255.255.255.252, gw=10.1.10.2;
HL950> start interface data ethernet:if=eth0;
LIF E1 Module Configuration:
HL950> set interface line x1:tmode=unframed, cmode=slave;
HL950> start interface line x1
CES Application Configuration:
HL950> add ces ip:name=hl950_1, ip=10.2.20.1, port=2142, payload=256,
cesoip=axerra, clock=external, jb=10;
HL950> start ces ip:name=hl950_1;
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Page 45 (159)
Figure 18
Multi Service Edge Device HL950
Administrator's Guide
EN/LZT 108 5995 R3
June 2003