Product manual

Product Manual - DM991 Series V Family - 204.4092.08 37
9. OPERATION DESCRIPTION
The equipment works completely autonomous, meaning once it has been configured it does not need
external intervention; as well as if it is initialized it goes automatically into operation according with the
configuration saved on the (E2PROM) memory, without needing any special initializing procedure. The
interfaces statuses are indicated by (LEDs) and automatically go back into normal operation when any
malfunctioning status is corrected.
9.1. Equipment Management
There are the following different ways to manage the DM991 family modems:
• Through a VT100 terminal (using PC emulator);
• Through the DMG20 management card, that acts as an SNMP proxy agent,
communicating with the DM991S/SE through the RS485 interface with the Telebrás
protocol for modem management in sub-racks. Can be integrated to the DATACOM
equipments management system using the DmView software;
• Through the remote management, that can be integrated to the DATACOM equipments
management system using the DmView software. This configuration can be used when
the DM991 is the remote to a DM705 equipment (as shown on Figure 14).
Figure 14. DM991 Managed as DM705 remote
9.2. Equipment Clocks
9.2.1. Transmission Clock
The modem transmission clock can be configured through the terminal or the management and there are
the following clock options:
• Internal - is obtained from the modem’s crystal oscillator, with 25 ppm precision.
• Regenerated from the G.shdsl interface - has the same precision as the equipment
providing the signal. When configured as LTU, the modem can not be configured with
regenerated clock.
The terminal has management priority over other methods. This way, the management opening via
germinal will disconnect other active managements at that instant..
Only DM991S/SE modems can be directly managed through the DMG20 management card.