General Description - FibroLAN FEM4 User And Installation Manual

Advanced FE/E1 Fiber Converters

General Description

All FEM/FEM4 models have identical functionality and performance. Therefore, any
description and features of one model refers to all other types.
The FEM/FEM4 is available with a variety of multi-mode and single-mode interfaces
with distance ranging from 2km to 150km.
It converts 100Base-FX signals received on its F/O interface in 10/100Base-TX signals
and distributes them to 4 copper (shielded RJ-45) ports. Each of these ports is
buffered; furthermore, in Aggregation mode (DIP switch S10 in down position) 4
separate groups are formed each including one Ethernet copper port and the common
F/O port, providing the users with basic security (no connection between the users).
AMI or HDB3 bipolar line code support on the E1 copper interface. (via DIP switch S3)
The Ethernet copper ports are auto-negotiating and will automatically adapt
themselves to the capacity of the users for highest performance (will negotiate 10/100
and FDX/HDX). Nevertheless, in some cases it may be necessary to force certain
operating mode
For this purpose, copper port 1 may be (individually) forced to the following
combinations: 10/FDX, 10/HDX, 100FDX or 100/HDX. While the TP ports 2, 3,and 4
operate in auto-negotiation, this port might be set via the front panel DIP switches S7
S8 and S9 to one of the above operation modes (refer to section 11)
The F/O port supports 100Base-FX transmission, set to FDX (Full Duplex) mode.
The F/O port will always operate in FDX even when the TP port operates at HDX.
Front panel diagnostic LEDs provide information on the operation mode of every port.
The device is housed in a compact and rugged metal case, providing strong free –air-
cooling for extended stable operation and reliability.
The FEM/FEM4 is packaged in a rugged "half rack" enclosure allowing elegant and
safe deployment in a variety of environments: desktop, 2 units on a 19" rack-shelf or
within a standard "half 19" rack (optional brackets required).
The FEM/FEM4 is equipped with a single internal power supply (100 - 240V universal
input), or an optional -48 VDC power supply (PS48) highly overrated to increase the
system's MTBF. A front panel LED indicates the power status.
The FEM/FEM4 supports the Far End Fault (FEF) feature
.
Far End Fault occurs when the signal detection is logically false from the receive
(Incoming path) fiber port. When the FEM/FEM4 detects a F/O Link Loss condition, the
unit will automatically send a Far End Fault signal to the remote device (on it outgoing
path). The remote device should support the same FEF feature and it will
Indicate a Link Loss as well. (Refer to section 6 for more details).
The Alarm Indication Signal (AIS) consists of an unframed all-ones signal
transmitted to maintain transmission continuity in case of LOS (loss of data)
occurrence.
The FEM/FEM4 device features user-selectable E1 port Local and Remote Loop-Back
monitoring for diagnostics purposes (enabled/disabled by DIP switches S1 and S2).
Diagnostic LEDs ease installation and troubleshooting (see "Front Panel" section)
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