PEF24901HV22XT Lantiq, PEF24901HV22XT Datasheet - Page 93

• Manufacturer Part Number: PEF24901HV22XT
• Manufacturer: Lantiq

Specifications of PEF24901HV22XT

• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

6.2.2
The Loop register controls local digital loopbacks of the DFE-T V2.2. The analog
loopback (No. 1) and remote loopbacks are closed by use of C/I codes. For the loopback
configurations that are available by the LOOP register see also
LOOP
Reset value: 08
DLB
TRANS
Data Sheet
7
0
LOOP - Loopback Register
Close Framer/Deframer loopback
the loopback is closed at the analog/digital interface
prerequisite is that LB1, LB2, LBBD and U/IOM
only user data is looped and no maintenance data is not looped back
the DLB loop operates always in transparent mode
0 =
1 =
Transparent/ Non-Transparent Loopback
in transparent mode data is both passed on and looped back whereas in
non-transparent mode data is not forwarded but substituted by ’1’s (idle
code) and just looped back
if LBBD, LB2, LB1 is closed towards the IOM
set to ’0’ then the state machine has to be put into state ’Transparent’ first
(e.g. by C/I = DT) before data is output on the U-interface
bit TRANS has no effect on DLB (always transparent) and the analog
loopbacks (AR1 operates always in transparent mode)
0 =
1 =
H
DLB
6
Framer/Deframer loopback open
Framer/Deframer loopback closed
transparent mode
non-transparent mode
’1’s are sent on the IOM
TRANS
5
read*
IOM
U/
4
®
94
)
/write
®
-2 interface in the corresponding time-slot
3
1
®
interface and bit TRANS is
LBBD
®
are set to ’0’
2
Chapter
Register Description
LB2
1
4.4.1.
Address: 10
PEF 24901
2002-09-30
DFE-T
LB1
0
H