peb22504 Infineon Technologies Corporation, peb22504 Datasheet - Page 50

• Manufacturer Part Number: peb22504
• Description: Quad Line Interface Unit For E1dt1dj1 Quadliu
• Manufacturer: Infineon Technologies Corporation

PEB 22504
QuadLIU V1.1
Interface Description
4.4.4
In-Band Loop Generation and Detection
The QuadLIU™ generates an unframed IBL (In-Band Loop) pattern and detects a
framed or unframed IBL pattern according to ANSI T1. 403. The detection works even in
-2
the presence of bit errors at a rate of up to 10
. The loop-up and loop-down patterns are
programmable individually from 2 to 8 bits in length (LCR1.LAC(1:0) and
LCR1.LDC(1:0)). Programming of loop codes is done in registers LCR2 and LCR3, using
default values 00001 for activation and 001 for deactivation of the loop. The in-band loop
generator and monitor can be placed either on the receive or transmit path
independently
(LIM3.GTP,
LIM3.MTP).
The
monitor
is
enabled
by
setting
LIM3.EPRM = 1. If the in-band loop code has been detected for at least 5 s, the
QuadLIU™ optionally switches the remote loop on or off according to ANSI T1.403
(LIM0.ARL = 1). The current state of the remote loop is indicated in a status register.
Replacing the receive or transmit data with the in-band loop codes is done by
LCR1.XLD/XLA.
Status and interrupt-status bits inform the user whether loop-up or loop-down code was
detected.
Data Sheet
50
2001-02