ATL Telecom OM25 - Manual (Page 10)

ATL User Guide
OM25 O
Optical M Modem
10
2 EXAMPLE APPLICATIONS
Two OM25s may be linked via a dual fibre single mode optical link to provide end-to-end electrical
interfaces, either of like type (ie G703 to G703) or of different type (G703 to V35). One of the units
is configured as timing source (CO) , the other as timing sink (CPE).
Additionally, one of the units is configured as ‘master’, the other as ‘slave’. The ‘master’ unit is the
source of link management and is able to configure and monitor the slave settings but not vice
versa.
Either master or slave can be set to be CO.
A simple point-to-point network between two terminals is shown in Fig 2.
Figure 2
A tandem section, where the modems are connected in series with another transmission system or
equipment that is the source of timing, is shown in Fig 3.
Figure 3
G.703
or V.35
OM25 - CO OM25 - CPE
Optical Fibre
Cables
G.703
or V.35
Network
Timing
G.703
or V.35
OM25 - CO OM25 - CPE
Optical Fibre
Cables
G.703
or V.35