ADC LPS-H4TU-C-L5 User Manual page 44

Testing
6 Press to activate the loopback command or press
Y
to disappear momentarily. The currently active loopback then displays (see
If an HDSL4 loop goes down during a loopback, the loopback appears to continue, although it
does not. The command for this loopback must be deactivated before another loopback can be
initiated.
Field Option
H4LXC ACT NET
ACT CUST
SEND LPBK
DEACTIVATE
H4LXR ACT NET
ACT CUST
DEACTIVATE
(a) When a network loopback is in progress, an unframed "all-ones" signal (AIS) or Los Of Signal (LOS) is transmitted to the
customer interface, depending on the setting of the network loopback pattern.
(b) When a customer (CPE) loopback is in progress, the Alarm Pattern setting from SCU H4LX Unit Configuration is returned to
the network as keep-alive (default is AIS).
(c) The SEND LPBK option sends a request through the DS3 MUX to the network to activate a loopback on a predefined DS1
facility at the other end of the network. This request is indicated by the text "<LPBK RQ" that appears on the loopback screen.
The predefined DS1 facility responds by activating a loopback on the associated remote unit. The receipt of the SEND LPBK
request is acknowledged by the text "LPBK RQ>" that appears on the loopback screen.
SEND LPBK can only be activated when the DS1 Loopback Mode parameter on the Broadband
DS3 MUX Configuration screen is configured as C-Bit parity.
36
Modifying LOOPBACK Status...
Are You Sure? (y/n)
Figure 25. Low Speed Loopback Status/Commands Screen
Table 13. Options in Loopback Selection Fields
Loopback Type
Network Loopback at the H4LXC
Customer Loopback at the H4LXC
DS1 facility loopback at other end of network requested through DS3 MUX
All Loopbacks (SCU v3.6.2 only)
All H4TU-C Loopbacks (SCU v4.1 only)
Network Loopback at the H4LXR
Customer Loopback at the H4LXR
All Loopbacks (SCU v3.6.2 only)
All H4TU-C Loopbacks (SCU v4.1 only)
December 3, 2003
to cancel the command. Pressing
N
Figure
(a)
(b)
LTPS-UM-8054-01
causes the screen
Y
25).
(c)
LPS-H4TU-C-L5