PEF81902FV1.1 Lantiq, PEF81902FV1.1 Datasheet - Page 137

• Manufacturer Part Number: PEF81902FV1.1
• Manufacturer: Lantiq

Specifications of PEF81902FV1.1

• 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 58
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.
Besides the remote controlled loopback stimulation via the M channel, the T-SMINT
features also direct loopback control via its register set.
3.2.1
The T-SMINT
The internal local loop (internal Loop A) is activated by a C/I command ARL or by
setting the bit LP_A (Loop Analog) in the S_CMD register if the layer-1 statemachine is
disabled.
The transmit data of the transmitter is looped back internally to the receiver. The data of
the IOM
Data Sheet
S-BUS
â
-2 input B- and D-channels are looped back to the output B- and D-channels.
Layer-1 Controller
Layer-1 Controller
S-Transceiver
Layer 1 Loopbacks
Analog Loop-Back S-Transceiver
Loop 2
Figure
â
Test Loopbacks
IX provides test and diagnostic functions for the S/T interface:
PBX or TE
IOM
IOM
IOM-2
NT
58.
®
®
-2
-2
U-Transceiver
U-Transceiver
U-Transceiver
Loop 2
Loop 2
Loop 2
Loop 3
U
U-Transceiver
Loop 1 A
123
Repeater
IOM
(optional)
®
-2
U-Transceiver
Operational Description
U
U-Transceiver
Exchange
Loop 1
loop_2b1q.emf
PEF 81902
IOM
2001-11-12
®
-2
â
IX