Specifications

Installation and Operation Manual Chapter 1 Introduction
FOM-E3/ETH, FOM-T3/ETH Ver. 1.0 Technical Specifications 1-5
Timing
Figure 1-3 shows flow of the clock signals in the FOM-E3/ETH or FOM-T3/ETH
unit. The modems support only internal clock, where an on-board crystal
oscillator (±25 ppm) serves as the timing source for the system.
Alarm Relay
FOM-E3/ETH and FOM-T3/ETH feature an alarm port, used for the relay of the
alarm conditions (AIS and ERR) by means of Normally Open and Normally Closed
dry contacts, using different pins of the DB-9 port connector.
1.4 Technical Specifications
Fiber Optic
Interface
Operating
Wavelength
850 nm, 1310 nm, or 1550 nm (see Table 1-1)
Line Coding CDP
Connectors ST, FC, or SC
Output Power See Table 1-1
Receiver Sensitivity See Table 1-1
Range See Table 1-1
Ethernet
Interface
LAN Table 1,000 MAC addresses
Aging 5 minute, automatic
Filtering and
Forwarding Rate
150,000 packets per second, max
Buffer Size 85 frames
Delay 1 frame
LAN Standard IEEE 802.3/Ethernet V.2, IEEE 802.1p
LAN Data Rate • 10BaseT: 10 Mbps (20 Mbps in full duplex)
• 100BaseT: 100 Mbps (200 Mbps in full duplex)
Transmission Line 4-wire, Category 5 UTP, 19 AWG to 26 AWG
Line Code • 10BaseT: Manchester
• 100BaseT: MLT3
WAN Protocol Point-to-point