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Detailed Description of the Model 3124 10
Model 3124 User Manual 1 • Introduction
After the DSL module aggregate 24/48 ports DSL traffic into the network processor card, the network proces-
sor terminates the ATM traffic into Ethernet packets through its SAR (Segmentation and Reassembly) func-
tion. The network processor also provides the Layer-2 Ethernet functions; it can support the mapping between
the ATM VCI and VLAN ID (802.1q) and priority queues (802.1p). The mapping functionality between
ATM PVC and VLAN ID include one PVC to one VLAN ID and multiple PVCs to one VLAN ID. And
these mappings can be configurable.
LEDs and Interfaces
Figure 4. Model 3124 Front Panel
Cooling System
The cooling system of the Model 3124 consists of a fixed fan card and a swappable air filter. The fan card has
four fans to blow air through the DSLAM for cooling. The air filter is for trapping air-bourn particulates. The
filter is field-installable and filed- replaceable.
Features:
• Built-in 4 DC fans with error indicating signal for monitoring the status of fan module
• The fan will be turned on when system temperature is higher than T°C and will be turned off when system
temperature is less than T-10°C (the temperature threshold T can be configured).
Table 3. Model 3124 LEDs
LED Description
SYS To indicate the system operation status
ALM To indicate the system alarm status
GBE To indicate the optical trunk port status
DSL Status To indicate the DSL status for each DSL port.
GBE - Speed
(LED on RJ-45)
To indicate the trunk port transmission speed
(Orange color LED on the Ethernet port)
GBE - Link/Act
(LED on RJ-45)
To indicate the trunk port data activity status
(Green color LED on the Ethernet port)
Table 4. Model 3124 Interfaces
Interface Description
GBE Gigabit Ethernet electrical trunk port
Console RS-232 port connected to the terminal for monitoring and controlling the system.
POTS RJ-21 connector (50-pin dual row header) for connecting POTS lines.
LINE RJ-21 connector (50-pin dual row header) for connecting DSL lines.