FMUX/S-4E1-E2 Multiplexer
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Copyright © 2007 Cronyx
6
1.2. FMUX/4 family overview
Main characteristics of the FMUX/4 family multiplexers:
• transmission of up to 4 E1 channels over a fiber optic link (or over a E2 link);
• single-mode or multi-mode fiber;
• up to 170 km distance;
• capability to operate over a single fiber;
• availability of models with a Ethernet (10/100Base-T) digital port or a universal
port (V.35/RS-530/RS-232/X.21);
• Ethernet virtual local area network (VLAN) support;
• compliance with ITU-T G.703, G.704, G.742, G.751, G.823, G.955, O.151, and
IEEE 802.3 standards;
• local and remote loops;
• built-in error rate meter (BER tester);
• RS-232 console port;
• remote management over SNMP via a dedicated Ethernet (10Base-T) port;
• emergency alarms ('dry relay contacts');
• compact design (1U) for rack-mounting;
• built-in power supply unit for mains or battery supply.
The device may be managed via the RS-232 interface using an ASCII terminal (console),
or via Ethernet using the SNMP protocol.
The indicators on the front panel of the multiplexer show link availability, serviceability
of the link transceiver, loop switched-on states, and testing modes.
The built-in BER tester allows measuring error rate in the link. The measurements are
performed using fixed or pseudo-random code according to the O.151 standard (the pat-
tern length is 2
23
-1=8,388,607 bits).
Remote login from the local device to the remote one is provided to allow remote control,
when there are no personnel on the remote side of the link. Commands are transmitted to
the remote deice via an additional service channel.
The device is equipped with an emergency alarm relay, the 'dry' contacts of which may
switch on an external device to call the operations personnel (according to G.742 and
G.751).
