Datacom DM16E1 - Failure Situations

DM16E1 / DM4E1 Operation and Installation Manual - 204-4001-19 91
12.4. Failure Situations
In addition to the alarms mentioned above, the failure situations shown in the following tables produce the
distinctive signals on the corresponding or associated interface:
All
tributaries
To
aggregate
Respective
tributary
Failure in external
clock
Generates
Remote unit
detects transitory
synchroniz. failure
Does not
generates
AIS
Does not
generates
AIS
Does not
generates
AIS
Mux
Loss of tributary
signal – 8.448kbit/s
Generates
(1)
In the interface that
corresponds to this
signal
Does not
generates
AIS
Does not
generates
AIS
Generates
AIS towards
E3
(1)
Loss of aggregate
signal - 34.368kbit/s
Generates
(1)
Sends alarm
(1)
Generates
AIS
(1)
Does not
generates
AIS
Generates
AIS
Loss of
synchronization in
aggregate
Generates
(1)
Sends alarm
(1)
Generates
AIS
(1)
Does not
generates
AIS
Generates
AIS
Indication of remote
alarm
Generates Does not answer
Does not
generates
AIS
Does not
generates
AIS
Does not
generates
AIS
Demux
Failure in supply
source
Generates
(1)
Remote unit
detects carrier
failure when there
is no backup
source
Part of DM4E1
DM16E1
Mux and
Demux
Alarm condition
Resulting actions
Local Alarm
Alarme signaling for
the remote unit
Generation of AIS
Does not
generates
AIS
(2)
Does not
generates
AIS
(2)
Does not
generates
AIS
Table 20. Failure indication according to G.751 (ITU-T recommendation for E3 multiplexing)
1) Mandatory according to G.751.
2) Optional according to G.751.