The primary photograph shows all 3 units powered up, only the top and middle units are connected together via fibre so the lowest unit has the SYNC LOSS led on
RAD OPTIMUX E2/E1 Multiplexer
This equipment is designed as a multiplexer that combines up to four E1
channels (2048 kbps) over a single fiber optic E2 (8448 kbps) link with a typical maximum range of 50Km based on a .4dB loss/kilometer
Designed for highly secure communications or harsh environmental conditions, providing long haul data links
Model 4E1L fitted with options B/AC/S/SC13L
These options mean:
B = E1 is balanced
AC = AC power supply (120 - 240V)
S = Service channel fitted
SC13L = SC connector - 1310 nm single mode laser
Each E1 channel operates independently from each other, such that the clock of each E1 channel is independent of the clock of any other E1 channel.
The E1 interface is designed for 120Ω balanced interconnect
If you need it, I can supply documentation regarding the basic specifications and also a user guide for RADview management software.
To facilitate system diagnostics, the Optimux-4E1L features LED status indicators,
AIS alarm generation, recognition and dry contact closure upon link failure.
You can pair this unit opposite another Optimux-4E1 standalone unit or an OP-4E1 card for the LRS-24 19-inch rack with central SNMP management, supported management software: RADview-PC running on PC/Windows or RADview-HPOV running on an HP OpenView UNIX platform
COSMETIC CONDITION:
All units are in excellent condition, clean cases with no front panel damage
One unit has a rear corner crack but this in no way affects the operation of the equipment
TESTING:
At power up the system undertakes a basic power on test (REM lit and upon power up test completion all of the AIS red leds light momentarily) - meaning POT is successful and the unit then sits waiting for data.
At this point, these leds are operating:
PWR
CH 1
CH 2
CH 3
CH 4
SYNC LOSS
I connect fibre between two units and established that the service channel is working (the system call button activates this)
Connecting the fibre also establishes an E2 link so the Sync Loss indicator is now off.
Two methods of managing this equipment, via a terminal or PPP
Terminal mode (monitor)
Management of the equipment is via a DB9 Control port on the front panel, no problems connecting using 9600 (8-N-1-N) with a DTE cable
After bootup, the terminal says
For MONITOR mode enter <CR> monitor <CR>
After entering MONITOR mode, I then get asked for a dreaded password - I am unaware what the password may be. I have looked around online but cannot find a method of bruteforce to reset the equipment (no reset button for example) so it is here that I am stuck, I cannot do anything else to configure the equipment but at least I can "talk" to it via a terminal.
PPP is more tricky to setup and appears to rely on the use of suitable management software mentioned above so I made no attempts to set up the PPP communications.
So my testing has halted at the point when I accessed the equipment via a terminal and hit a password request.
I chatted with the unit via the control port (standard 9600 null cable but this system also auto-detects other baud rates)
It is presently password enabled - ps unknown at this stage
Looking around on how to perform a hardware reset WITHOUT using the config menu, which I cannot get into!
Although I have the documentation for RADview PC, I do not have the software installed on my system so this was not used
