Specifications

Chapter 1 Introduction FOM-40 Installation and Operation Manual
1-2 Overview
Figure 1-2 shows a application of FOM-40 that uses an X.21 interface adapter in a
digital network tail-end configuration.
Figure 1-2. Tail-End Application for DDS Service
Features
Fiber Optic Interface
Table 1-1 lists the characteristics of the fiber optic interface types of FOM-40 and
FOM-40/R, including the maximum ranges. The maximum range values given
assume a margin of 3dB.
Table 1-1. Fiber Optic Interface Types
Option Wavelength
[nm]
Fiber Type
[µm]
Transmitter
Type
Typical
Output Power
[dBm]
Receiver
Sensitivity
[dBm]
Typical
Attenuation
[dB/km]
Typical
Range
[km] [mi]
Connector
85 850 62.5/125
multimode
VCSEL -18 -39 3.5 4.5 2.8 ST, FC, SC
13L 1310 9/125 single
mode
Laser -12 -40 0.5 50 31 ST, FC, SC
15L 1550 9/125 single
mode
Laser -12 -40 0.25 100 62 ST, FC, SC
DTE Interface
FOM-40 operates at the 14 selectable baud rates: 56, 64, 96, 112, 128, 192, 256,
384, 512, 768, 1024, 1536, 1544, and 2048 kbps. This includes the 1544 kbps
rate for T1 and 2048 kbps rate for E1 transmission.
FOM-40 supports the following DTE interfaces:
• V.24/RS-232 (up to 64 kbps)
• RS-530
• V.35
• X.21
• V.36
• IR-G.703/CO (G.703 Codirectional, 64 kbps)
Timing
FOM-40 transmit timing can be derived either internally, or externally. Possible
external sources for the transmit timing are the data terminal or the receive signal.
The receive timing is always regenerated from the receive signal.