PEB 2091
PEF 2091
Programming
6.8.8
Deactivating S/T-Interface Only
The following example shows the procedure for deactivating the S-interface only while
leaving the U-interface active.
NT
LT
<––––– C/I AI
–––––> C/I AI
(1100B)
(1100B)
C/I AI
(1100B) –––––> ; Initial state: layer 1 activated
(1000B) <–––––
C/I AR
<––––– C/I DR
–––––> C/I DI
<––––– C/I DC
(0000B)
(1111B)
(1111B)
C/I UAR
C/I UAI
[C/I DC
(0111B) <––––– ; Deactivate S-interface only
(0111B) –––––> ; S-interface is deactivated
(1111B)] <––––– ; Exchange retains no control
6.8.9
Activation Initiated by LT with Repeater
For LT and NT the activation procedure with a repeater between exchange and network
is identical to that described at the beginning of this chapter. The repeater transforms the
received U-signals into C/I-codes and monitor messages. These codes and messages
pass the repeater control unit (e.g. µP). In this control unit a number of adaptations are
made to comply with a specific national specification.
In this section only C/I-codes are considered which need to be transformed by the control
unit such that the repeater counterpart will operate correctly. In addition overhead bits
and the specified 2B+D data needs to be transferred for a correct repeater
activation/deactivation.
In order to recognize the dependence of LT-RP and NT-RP-signals more easily, the
arrows point towards the middle.
When activating the repeater unit from the exchange side, the UAI-code issued by the
LT-RP needs to be converted into AI for the NT-RP.
LT-RP
NT-RP
C/I DC
(1111B)
<––––– <––––– C/I PU
(0111B) ; Initial state "Power Up" to
provide timing
C/I DI
(1111B)
(1000B)
(1000B)
(1001B)
(0111B)
(1100B)
–––––> –––––> C/I TIM
<––––– <––––– C/I DC
–––––> <––––– C/I AR
–––––>
(0000B)
C/I AR
C/I AR
C/I ARM
C/I UAI
C/I AI
(1111B) ; Activation started by LT
(1000B)
; Activation proceeds
(1100B)
(1100B) ; Activation complete
–––––> –––––> C/I AI
–––––> <––––– C/I AI
Semiconductor Group
246
Data Sheet 01.99
INFINEON [ Infineon ]
