PEB24911HV13 Lantiq, PEB24911HV13 Datasheet - Page 101

• Manufacturer Part Number: PEB24911HV13
• Manufacturer: Lantiq

Specifications of PEB24911HV13

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.4.1.3
Upon receiving the EOC-command LBBD in EOC automode, the NT U-transceiver does
not close the loopback immediately. Because the intention of this loopback is to test the
complete NT, the U-transceiver passes the complete loopback request on to the next
downstream device (e.g. S-Transceiver). This is achieved by issuing the C/I-code AIL in
the “Transparent” state or C/I = ARL in states different than “Transparent”.
If the downstream device is not able to close the complete loopback, a MON-8-message
LBBD may be returned to the NT U-transceiver. This in turn will close the complete
loopback within the NT U-transceiver itself (B1 + B2 + D-channels).
All remaining IOM
still read from the IOM
to deactivate the NT despite the fact that the loopbacks are controlled by the exchange.
Figure 38
•
Figure 38
The complete loopback is opened again by the NT U-transceiver (e.g. IEC-Q, PEB 2091)
when the EOC command RTN or the MON-8-command NORM is received. No reset is
required for loopback #2. The line stays active and is ready for data transmission. The
typical procedure for closing and opening a complete loopback is demonstrated in the
examples below. There the LT is always operated in EOC automode.
Complete Loopback in EOC Automode (NT-side):
•
Data Sheet
<––––
(–––>
S-Transceiver
NT IOM
C/I AR
C/I AI
2B+D
illustrates these two options.
Loopback No.2 - Complete Loopback
Complete Loopback Options in the NT
®
®
-2
-information (monitor, C/I-channel as well as the bits MR and MX) are
®
(1000
(1100
C/I = AIL/ARL
-2-interface. For this reason it is still possible for a layer-2 device
B
B
Controller
) C/I UAI
)
Layer-1
LT IOM
C/I AR
MON-8 "LBBD"
®
-2
91
(1000
(0111
NT U-Transceiver
B
B
28 B+D
) <––––
) ––––>
Auto-Mode
; U-interface is activated
;
;
; or with
Operational Description
without terminal
confirmation
EOC= "LBBD"
U
lp2bymon8.emf
PEF 24911
2001-07-16