Specifications

Installation and Operation Manual Chapter 5 Monitoring and Diagnostics
Optimux-34 Ver. 2.81 Frequently Asked Questions 5-11
Only one of the units
connected to a local
Optimux-34 does not
receive signal from the
remote equipment.
Connection problem Check the equipment connected to the local channel
External problem
1. Activate the port local loop on the Optimux-34.
2. Check that any previously lit alarm indicators related
to the channel turn OFF.
3. If the indicators turn OFF, the problem is external.
Check the remote equipment.
Defective Optimux-34 Replace Optimux-34
SYSTEM FLT indicator is
ON
Defective Optimux-34 Replace Optimux-34
V.35 interface does not
transfer data
External problem Check the interface connections.
Configuration problem 1. Check that the V.35 port is activated and set to Up.
2. Check clock settings on both ends.
5.4 Frequently Asked Questions
Q: What is the relationship between the main link (E3) and the tributary clock?
A: In PDH technology, the E1 clock and the main link clock are not related at all.
This means that a product can multiplex several E1s with completely different
timings over any kind of main link (E2, E3, T3, etc.), while the E1 clock is
regenerated at the other end, no matter what the main link clock is. This is by
definition PDH technology.
Since the Optimux is a PDH multiplexer, you can work an Internal clock opposite
an Internal clock (a frame clock such as E3) without any problem. The E1 is
transmitted transparently from one side to the other. The purpose of internal,
external, and loopback timing is only to synchronize the framer (that is the main
link).
Internal, external, and loopback timing clocks are needed to create the framer
clock. However, they have no influence on the E1 but only on the E3 framer rate.
It means that no clock relation is needed between two Optimux units.
Both Optimux units can work in Internal clock without affecting the E1 clock. This
means that the E1 on side B will be exactly the same as on side A (the same
synchronization, the same timing). Actually, the loopback timing option is not
needed for a point-to-point application.
You can always configure both Optimux units in the Internal clock, and the E1/T1
will always pass through the remote Optimux transparently. In other words, we
can see the Optimux family as a cable. No special configuration is required to
work with the Optimux, it is a plug-and-play product.
Q: How long does it take to switch between the Main and Backup links?
A: Officially less than 50 ms. According to our tests, the switching time between
links is less than 40 ms.