Beijing Huahuan Electronics Co., Ltd.
6
H0FL-EthMux.SA1601/SA1602 User’s Manual V1.3
Choosing proper timing mode is important for ensuring service quality. In
most cases, setting both devices to adaptive timing mode is sufficient. But
sometimes, setting one device to loop timing mode may work better. For
example, setting the H0FL-ETHMUX.SA1601/SA1602 device connected with
the master clock (such as switch) to loop back mode, and the other device
connected with the slave clock (such as PBX remote module or PCM terminal)
to adaptive mode, is probably better than setting both to adaptive modes. It’s
better to set the both sides H0FL-ETHMUX.SA1601/SA1602 to loop back
timing mode when the both sides devices use synchronous master clock, such as
the switches with independent clock distribution network interconnect with each
other. In another case, set both sides H0FL-ETHMUX.SA1601/SA1602 to
adaptive timing mode when the both sides’ devices use asynchronous master
clock, at this time, slips will occur.
Note that one typical error in applications is to let both communication
devices (such as PCM terminal) work at slave clocks. Neither transmission
devices nor H0FL-EthMux.SA1601/SA1602 device will support such operation.
Tip:
At the beginning of startup, the clock usually takes several
minutes to be locked. During that period, errors and slips are normal.
Various timing schemes are listed in Table 1.3-1, which can be selected
according to the device interconnection shown in Figure 1.3-2.
H0FL-
EthMux
H0FL-
EthMux
E1/T1
E1/T1
FE
FE
A side
device
B side
device
A side
B side
Ethernet or IP
Figure 1.3-2 Diagram for device interconnection
