Black Box DESKTOP TELCO, Руководство пользователя

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TELCOLINK DT - AccessDSL NTU
User Manual
Version: 2.5 Page 12 of 66
3.2.4 AIS Generation
If this option is enabled, an unframed AIS (all 1's) will be transmitted on the E1 side, irrespective
of whether the system is configured in the transparent or framed mode. AIS generation will be
activated on the following conditions:

xDSL link to the remote station is not established (loss of signal or loss of frame alignment
on xDSL side) or

remote station is sending AIS or

AIS-R alarm is active.
If “AIS Generation” is disabled, no signal will be transmitted on the E1 side if any of these three
conditions occurs.
3.2.5 AIS Detection
If “AIS Detection” is enabled, receiving AIS from the E1 side will cause the following actions:

The Non-Urgent alarm will be set active (AIS-S).

AIS will be transmitted to the remote station by AIS-R.
3.2.6 Transmission of TS16
In Normal and Dual Pair Modes E1 data is loaded to xDSL according ITU-T G.991.2. In these
modes TS0 of E1 is mapped to TS0 of xDSL, TS1 to TS1 and etc.
To activate the signaling over TS16 the unit has to be set to the PCM 30 mode. If the unit has
less TS than 16, the last TS is used for signaling if the PCM 30 mode is activated.
3.2.7 E1 synchronization modes
3.2.7.1 Clocking structure
Internal
Clock
Stuffing
Clock
recovery
xDSL
Tx
xDSL
Rx
E1
Tx
E1
Rx
2 Mbit transmit clock
xDSL recovered clock
E1-side xDSL side
Figure 3-1: Synchronous Operation
The primary TX clock source for module with E1 interface is:

For Master:
o
E1 2 Mbit transmit clock or Internal clock (in case of E1 signal loss).

For Slave:
o
E1 2 Mbit transmit clock (if plesiochronous mode is used (
“PLL” option at slave
side is on)) or Internal clock (in case of E1 signal loss);