DM16E1 / DM4E1 Operation and Installation Manual - 204-4001-19 104
15.16. External 2048kbit/s clock
A 2048kbit/s external clock connection for AIS generation is available on the rear panel. It is available as a
BNC connector when 2M (G.703) tributaries are BNC. It is an IEC connector when tributaries are IEC or
RJ45.
The external clock may be enabled or disabled. The equipment switches automatically to the internal clock
in case of a fault on the external clock.
Clocks may be cascaded from one device to another. In this case the 75 ohm load may be disconnected
from the intermediate devices. It should be maintained on the last device.
15.17. External Alarm
The equipment activates an alarm using a dry contact. It is available as a DB9 connector with one normally
closed pin and another pin which is normally open in relation to the common pin. Both change status when
the equipment alarm is on or the equipment is turned off.
The device also sports three inputs for external alarms. These can be activated by short-circuiting its
contacts or connecting one contact to 0V and the other to -48V.
More details can be found in chapter 12.
15.18. Terminal Connection
The whole configuration of the local and remote devices may be done via terminal. Some routing and
SNMP management configurations can only be done via the local terminal.
15.19. SNMP Remote Management
For SNMP management, analyze how each device will be managed: Directly managed via LAN port,
directly managed via WAN port (in band), remotely managed via another equipment (in band remote
management), or not managed.
If locally managed via LAN or WAN, IP and sub mask addresses must be set. In case the WAN is
configured as Frame Relay, DLCIs must also be set. For a WAN, the aggregate channel used must be set
as well. These configurations allow the management network to access the equipment. If PPP or Frame
Relay are to be used, it is recommended that the Default Gateway and the WAN port be set first because
these configurations require a system reset.
For LAN use, connect the Ethernet cable to the 10BaseT (RJ45) interface on the rear panel.
The read and write community to SNMP may be set, as well as if the device will allow SET commands or
not. These parameters must be locally configured for security reasons.
15.20. Power Connections
The front panel has two power inputs. The equipment may run under a single power supply or with a
secondary power unit as a backup. Power supplies may be inserted or removed while the equipment is
operating (hot swap).
There is no need for an AC supply and a separate 48VDC supply because each power unit may be run
from 93 to 250 Vac or 36 to 72 Vdc with automatic VAC/VDC selection. Polarity is interchangeable in the
case of DC input.
It is not necessary to power both supplies (main and optional backup) with the same kind of tension.
Be careful not to introduce a difference of potential between the DM16E1/DM4E1 an
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