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Chapter 1 - Introduction HCD-E1
Installation & Operation Manual
1-26 Technical Specifications 01/01/01 08:07
Diagnostics
Loopbacks
- HDSL main link local loopback, towards the
E1 sublink and data channels of the local
unit
- Channel loopback on the local unit towards
the DTE connected to the data channel of
the remote unit (per channel)
- Channel loopback on the remote unit
towards the DTE connected to the data
channel of the local unit (per channel)
- Channel loopback on the local unit towards
the DTE connected to its data channel (per
channel)
- In-band code-activated loopback on the
remote unit towards the DTE connected to
the data channel of the local unit
- E1 sublink loopback on the local unit
towards the equipment connected to the E1
sublink of the local unit
- E1 sublink loopback on the local unit
towards the equipment connected to the E1
sublink of the remote unit
- E1 sublink loopback on the remote unit
towards the equipment connected to the E1
sublink of the local unit.
- H-RPT local line loopback towards the
LTU-configured unit (available from the
LTU-configured unit in applications with an
H-RPT)
BERT Functionality
BER measurement through remote HCD-E1
(per data channel)
Timing
HDSL Link
Receive Timing
Always recovered from the received HDSL
signal
Transmit Timing
(user-selectable)
-
Internal timing, derived from a local
±50 ppm oscillator
- External timing, locked to the transmit clock
of a selected synchronous channel or to the
E1 sublink clock signal
- Loopback timing (remote unit only): locked
to the recovered HDSL receive signal of the
central unit