HCD-E1 Installation & Operation Manual Chapter 1 - Introduction
01/01/01 08:07 Overview 1-3
• Remote loopbacks on the data channel and E1 sublink of the local
HCD-E1
• Remote loopbacks on the data channel and E1 sublink of the remote
unit.
• Inband-activated remote loopback on the data channel of remote
HCD-E1
• H-RPT local loop (towards the HCD-E1 configured as central) when
working with the HDSL repeater.
In order to enable testing of marginal links, HCD-E1 also offers Bit Error Rate
(BER) testing on the synchronous data channels, using locally generated,
pseudo-random sequence. To provide compatibility with other BER testing
equipment, the user can select the pseudo-random pattern that best
matches his need.
Maintenance is further enhanced by advanced power-up self-test
capabilities, and by an automatically performed cyclic self-test that provides
circuit-level diagnostics data. The user can also read the diagnostic data of
the remote unit through the HDSL link.
HCD-E1 can identify the type of the unit at the remote end of the HDSL
link and provides the user with a possibility to read the diagnostic data of
the remote unit through the HDSL link.
LEDs and Alarms
HCD-E1 responds to any alarm detected during its operation by an alarm
message and stores it in a buffer that can hold up to 100 messages. A front
panel LED indicator lights when the alarm buffer contains alarm messages. The
local operator can then review the contents of the alarm buffer on the front
panel display, or from an ASCII terminal connected to the supervisory port.
HCD-E1 can provide an alarm indication by means of an alarm relay (dry
contacts), which enables remote signaling of alarm conditions when HCD-E1
is located far from the personnel in charge for its proper operation.
In addition to the alarm buffer, front-panel LED indicators display in real
time the status of the E1 sublink and the HDSL lines, and alert when test
loops are present in the system. The status of the LAN in the case of the
Ethernet version is indicated by the Ethernet module LEDs located on the
HCD-E1 rear panel.
Time Slot Handling
When operating in any of the framed modes, HCD-E1 allows the user to
configure the routing of the individual time slots for each of the data
channels, and for the sublink. The routing can be modified during system
operation, without disrupting the service to users of time slots that are not
rerouted. HCD-E1 automatically connects the time slots in both the receive
and transmit directions.