IDT82P2521 Datasheet, PDF (104/147 Pages) Integrated Device Technology – 21(+1) Channel High-Density E1 Line Interface Unit

IDT82P2521
LOOP - Loopback Control Register
Address: 019H, 059H, 099H, 0D9H, 119H, 159H, 199H, 1D9H, (CH1~CH8)
219H, 259H, 299H, 2D9H, 319H, 359H, 399H, 3D9H, (CH9~CH16)
419H, 459H, 499H, 4D9H, 519H, (CH17~CH21)
7D9H (CH0)
Type: Read / Write
Default Value: 00H
7
6
5
4
-
-
-
-
21(+1) CHANNEL HIGH-DENSITY E1 LINE INTERFACE UNIT
3
2
1
0
AUTOLP
DLP
RLP
ALP
Bit
Name
Description
7-4
-
Reserved.
3
AUTOLP This bit determines whether automatic Digital/Remote Loopback is enabled.
0: Automatic Digital/Remote Loopback is disabled. (default)
1: Automatic Digital/Remote Loopback is enabled. The corresponding channel will enter Digital/Remote Loopback when the acti-
vate IB code is detected in the transmit/receive path for more than 5.1 sec.; and will return from Digital/Remote Loopback when
the deactivate IB code is detected in the transmit/receive path for more than 5.1 sec.
2
DLP
This bit controls whether Digital Loopback is enabled.
0: Disable. (default)
1: Enable.
1
RLP
This bit controls whether Remote Loopback is enabled.
0: Disable. (default)
1: Enable.
0
ALP
This bit controls whether Analog Loopback is enabled.
0: Disable. (default)
1: Enable.
Programming Information
104
December 7, 2005