User's Manual

2. System Description 2-17

2.9 Data Interfaces

The primary interface for video and broadcast applications is the DVB-ASI interface

located in the mini-I/O card slot. Alternatively this interface can be replaced with STM-1

Optical/OC-3 or STM-1 Electrical interfaces. The optical interface is single mode at 1300

nm. Consult factory for availability of Mini-I/O STM-1/OC-3 Module.

The I/O card has 2x100BaseTX interfaces that can be configured as either primary

payload, or secondary wayside channels. The Over-the-air channel has a data-bandwidth

capacity that is set by the frequency-bandwidth, modulation, and coding. The data-

bandwidth may be allocated to various I/O card interfaces, including 155.52 Mbps for

DVB-ASI or STM-1, 2 Mbps per E1, up to 100 Mbps Ethernet, and up to 1 Mbps NMS.

Only up to 100 Mbps of data-bandwidth may be allocated for either net data, and the two

I/O card 100BaseTX interfaces will share that 100 Mbps data-bandwidth.

2.10 100 Mbps Fast Ethernet

Scalable Ethernet data rates up to 100 Mbps can be achieved with the Standard,

Enhanced and Super PDH (i.e., 42xE1/T1) Master I/O cards. Higher data rates can be

achieved using the 155FE (Fast Ethernet) capability.

2.10.1 155Mbps Fast Ethernet

Ethernet payload rates over 100 Mbps (such as 155 Mbps) can be achieved on a Fast

Ethernet EVENT 5800 by using both 100Base-TX payload ports. In this configuration, two

Ethernet channels are provisioned in the payload frame. The maximum traffic rate for

each Ethernet channel to the framer is defined in the modes file. This mode is not

supported for 2+0 configuration.

2.10.2 Two Network Operation

This mode can be used to provide access to two separate Fast Ethernet users, and

guarantee the throughput level for each. Different rates for each port are supported, as

configured in the modes file. In this mode, each channel operates as a single channel

would in a single port mode.

Figure 2-17. Two Network Operation

2.10.3 Single Network Operation

This configuration is an extension of the Two Network mode described above. There are

no changes in the programming or operation of EVENT 5800. This mode allows a user to

transmit data from a single network at a rate greater than 100 Mbps. The external router

is required to handle the management of the trunk. The router must ensure that the

same MAC address is not delivered to both ports.

Figure 2-18. Single Network Operation

2.11 Gigabit Ethernet (1000 Mbps)

Scalable Ethernet data rates up to 300 Mbps can be achieved with a Gigabit Ethernet

scalable EVENT 5800. Data rates up to 155 Mbps are available with the Standard

Modem/IF module. Data rates up to 300 Mbps are available with the Wideband Modem

I/F module. EVENT 5800 can be configured to aggregate Ethernet bandwidth across two