PEB3086 Infineon Technologies, PEB3086 Datasheet - Page 155

• Manufacturer Part Number: PEB3086
• Description: ISDN Subscriber Access Controller
• Manufacturer: Infineon Technologies

• loop at the analog end of the S interface;
• transmission of special test signals on the S/T interface according to the modified AMI
Data Sheet
code are initiated via a C/I command written in CIX0 register.
TE / LT-T mode
Test loop 3 is activated with the C/I channel command Activate Request Loop
(ARL). An S interface is not required since INFO3 is looped back internally to the
receiver. When the receiver has synchronized itself to this signal, the message "Test
Indication" (or "Awake Test Indication") is delivered in the C/I channel. No signal is
transmitted over the S interface.
In the test loop mode the S interface awake detector is enabled, i.e. if a level is
detected (e.g. Info 2/Info 4) this will be reported by the Resynchronization Indication
(RSY). The loop function is not effected by this condition and the internally
generated 192-kHz line clock does not depend on the signal received at the S
interface.
NT / LT-S mode
Test loop 2 is likewise activated over the IOM-2 interface with Activate Request
Loop (ARL). No S line is required. INFO4 is looped back internally to the receiver
and also sent to the S interface. When the receiver is synchronized, the message
"AIU" is sent in the C/I channel.
Two kinds of test signals may be sent by the ISAC-SX:
– single pulses and
– continuous pulses.
The single pulses are of alternating polarity, one S interface bit period wide, 0.25 ms
apart, with a repetition frequency of 2 kHz. Single pulses can be sent in all
applications. The corresponding C/I command in TE, LT-S and LT-T applications is
TM1.
Continuous pulses are likewise of alternating polarity, one S-interface bit period
wide, but they are sent continuously. The repetition frequency is 96 kHz. Continuous
pulses may be transmitted in all applications. This test mode is entered in LT-S,
LT-T and TE applications with the C/I command TM2.
155
Description of Functional Blocks
PEB 3086
2003-01-30
ISAC-SX