PEF80912HV14XT Lantiq, PEF80912HV14XT Datasheet - Page 57

• Manufacturer Part Number: PEF80912HV14XT
• Manufacturer: Lantiq

Specifications of PEF80912HV14XT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

3.2
Test loopbacks are specified by the national PTTs in order to facilitate the location of
defect systems. Four different loopbacks are defined. The position of each loopback is
illustrated in
•
Figure 24
Loopbacks #1, #1A and #2 are controlled by the exchange. Loopback #3 is controlled
locally on the remote side. All four loopback types are transparent. This means all bits
that are looped back will also be passed onwards in the normal manner. Only the data
looped back internally is processed; signals on the receive pins are ignored. The
propagation delay of actually looped B and D channels data must be identical in all
loopbacks.
Data Sheet
S-BUS
Layer-1 Controller
Layer-1 Controller
S-Transceiver
Layer 1 Loopbacks
Loop 2
Figure
Test Loopbacks
PBX or TE
IOM
IOM
IOM-2
24.
NT
®
®
-2
-2
U-Transceiver
U-Transceiver
U-Transceiver
Loop 2
Loop 2
Loop 2
Loop 3
U
U-Transceiver
Loop 1 A
49
Repeater
IOM
(optional)
®
-2
U-Transceiver
Operational Description
U
PEF 80912/80913
U-Transceiver
Exchange
Loop 1
loop_2b1q.emf
IOM
2001-03-29
®
-2