2 tandem section - externa, 1 g.703 to g.703 externa, Tandem section - external timing – ATL Telecom AM200 User Manual
Page 31: G.703 to g.703 external timing
ATL User Guide
AM200 Modem
31
7
7.2
TANDEM SECTION - EXTERNAL TIMING
For the following configurations, the modems are connected in series with another transmission system or
equipment that is the source of timing.
7.2.1 G.703 to G.703 External Timing
One of the connected terminals acts as a master, the other as a slave. A clock inside the master terminal then
becomes the reference clock for the entire system.
The clock us transported across the digital section. The remote terminal locks to this clock and returns the
clock to the AM200. An elastic store in the AM200 buffers the data.
1.
At the CO, select the 'Loop' timing option for the G.703 port.
2.
At the CPE, select the 'Local' timing option for the G.703 port.
AM200
CPE
AM200
CO
Network or
Terminal
Terminal
G.703
G.703
G.703
G.703
B
Network
Customer
Terminal
AM200A
AM200A
G.703/X.21/V.35/RS530
copper pair
Timing
G.703/X.21/V.35/RS530/100BaseT
CO
CPE