ATL Telecom AM200 - Manual (Page 29)

ATL User Guide
AM200 Modem
29
7
7.1.1 Internal Timing
7.1.1.1 G.703 to G.703 Internal Timing Master
Slave terminals are connected to the digital section at both ends. The clock source inside the CO then
becomes the reference clock for the entire system.
The internal clock is generated at the CO. Both terminals lock to this clock and return the clock to the
AM200s. An elastic store in the AM200 buffers the data.
1. At the CO, select the 'Local' timing option for the G.703 port.
2. At the CPE, select the 'Local' timing option for the G.703 port.
This is the default timing mode for G.703.
7.1.1.2 G.703 to X.21/V.35 Internal Timing
Slave terminals are connected to the digital section at both ends. A clock inside the CO then becomes the
reference clock for the entire system.
The internal clock is generated at the CO. Both terminals lock to this clock and return the clock to the
AM200s. An elastic store in the AM200 buffers the data.
1. At the CO, select the 'Local' timing option for the G.703 port.
2. At the CPE, select the 'DCE' mode option for the Nx64 port.
AM200
CPE
AM200
CO
Terminal Terminal
B
G.703 Nx64 DTE Nx64 DCE G.703
B
AM200
CPE
AM200
CO
Terminal Terminal
B
G.703 G.703 G.703 G.703
B