PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 130

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
4.3.5
The IEC-Q is in the "Synchronized 1" state (see "State Machine in NT Modes", page 160)
after a successful partial activation. IOM
the C/I-message "DC" as well as the LT user data is sent.
While the C/I-messages "DI" (1111
will transmit "SAI" = (0) upstream. Any other code results in "SAI" = (1) to be sent. On
the U-interface the signal SN3 (i.e. 2B + D = (1)) will be transmitted continuously
regardless of the data on received from the downstream side.
The LT will transmit all user data transparently downstream (signal SL3T). In case the
last C/I command applied is "UAR", the LT retains activation control when an activation
request comes from the terminal (confirmation with C/I = "AR" required, see page 132
(case 1)). With C/I "DC" applied from the upstream device, TE initiated activations will be
completed without the necessity of an exchange confirmation (page 133 (case 2)).
Figure 57
INFO
INFO
Partial Activation (U Only)
S/T
U Only Activation
0
0
SBCX
IOM -2
NT
DC
PU
DC
DI
R
IEC-Q
B
) or "TIM" (0000
SL3T
SL2
SN3
®
U-Reference Point
act
act = 0 dea =1 uoa =1
-2-clocks DCL and FSC are issued. On DOUT
130
0 =
act
SN0
SN0
SN2
SL0
SN1
SL1
TL
TN
0 =
dea
sai
1 =
=
uoa
0
B
) are received on DIN, the IEC-Q
0 =
IEC-Q
Operational Description
IOM -2
UAR
ARM
(DC)
UAI
DC
LT
AR
DI
R
Data Sheet 01.99
EPIC
ITD04245
PEB 2091
PEF 2091
R