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

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.

At the CO, select the 'Loop' timing option for the G.703 port.

At the CPE, select the 'Local' timing option for the G.703 port.

AM200

CPE

AM200

Network or

Terminal

G.703

Network

Customer

Terminal

AM200A

G.703/X.21/V.35/RS530

copper pair

Timing

G.703/X.21/V.35/RS530/100BaseT

CPE