ATL Telecom AM2048 - Manual (Page 17)

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telecom USER GUIDE AM768A/AM2048A
17
Issue 8
4.7.1 Point to Point Link
4.7.1.1 Standalone Section
The transmission channel can be a single optical fibre, one, two or three copper pairs.
4.7.1.1.1 G.703 to G.703 Internal Timing
Slave terminals are connected to the digital section at both ends, a clock inside the ELU then
becomes the reference clock for the entire system.
The internal clock T is generated at the ELU, both terminals lock to this clock and return the clock T to
the DSL units. An elastic store in the DSLUs buffers the framed data.
Using the “Configuration > User Port” Menu:
1. At the ELU, select the ‘Internal’ timing option
2. Using F8, cycle to the NTU user port, select the ‘Internal’ timing option
3. Press ‘Return’ to enter the changes.
4.7.1.1.2 G.703 to G.703 Transparent Timing
One of the connected terminals acts as a master, the other is a slave. However, both terminals could
operate independently or pleisiochronously.
Clocks T1 and T2 are independent of one another and are transported independently through the
DSL system.
Using the “Configuration > User Port” Menu:
4. At the ELU, select the ‘Transparent’ timing option
5. Using F8, cycle to the NTU user port, select the ‘Transparent’ timing option
6. Press ‘Return’ to enter the changes.
ELU NTU
Terminal 1 Terminal 2
ELU NTU
Terminal 1 Terminal 2
T
T
T
T
T T
ELU NTU
Terminal 1 Terminal 2
T1
T2
T2
T1