GEOS-2+2 Gigabit Ethernet to SONET Multiplexer
Features
- Supports up to OC-48 bandwidth
- Multiplexes up to 2 ports of gigabit Ethernet traffic plus up to an additional 2 ports of fast Ethernet traffic into SONET
- Integrates with Altera's POS-PHY Level 3 core
- Configurable destination port address
- Complies with frame-mapped generic framing procedures (GFPs) outlined by the International Telecommunications Union
- Supports a link-layer function
- Provides gigabit Ethernet traffic statistics per port
- Plugs-and-plays with Altera's POS-PHY Level 3 cores
- The interfaces and protocols includes the AtlanticTM interface, AIRbus (16-bit slave), and frame-mapped generic framing procedures
Block Diagram
Figure 1 shows the block diagram of the GEOS-2+2 megafunction.
Figure 1. Block Diagram
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Description
The GEOS-2+2 is designed to multiplex 2 channels of gigabit Ethernet traffic and 2 channels of fast Ethernet traffic into a single port 2.5 Gbps OC-48 SONET Framer using frame-mapped GFP.
There are three main sub-modules for the GEOS-2+2 core:
- ESMUX module multiplexes packets in the ingress (Ethernet-to-SONET) direction
- SEDEMUX module de-multiplexes packets in the egress (SONET-to-Ethernet) direction
- CPU interface module that connects up to an external CPU
The ESMUX multiplexes 2 GE with 2 fast Ethernet ports into one 2.5 Gbps SONET port. Jumbo packets are not supported by the GEOS-2+2. Each first-in, first-out (FIFO) channel is connected to one particular Atlantic interface from the PL3 core. A GFP header is attached to packets and sent to the PL3 core and then to the SONET framer. The GFP header contains various fields, such as destination port identification.
Packets received by the SEDEMUX from the SONET framer include a GFP header that contains a destination port. The GFP header is removed and the resulting packet is routed to the appropriate destination port
Device Utilization Example
Table 1 lists the typical device utilization results for the megafunction.
| Table 1. Typical Device Utilization for the Megafunction |
| Target Device |
Speed Grade |
Utilization |
Performance
(fMAX) |
Parameter Setting |
| Logic Elements (LEs) |
Embedded array blocks (EABs) |
I/O Pins |
| Cyclone® EP1C20 |
-6 |
10,661 |
55 |
220 |
108.5 MHz |
Contact Nuvation |
Deliverables
- Encrypted library provided
Contact Information
For additional information, please contact Nuvation:
Nuvation
3590 North First Street
San Jose, CA 95134
Tel: (408) 228-5580
Fax: (408) 228-5590
E-mail: ipcores@nuvation.com
URL: www.nuvation.com
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