ES10/ES26
Page 100/104
Document status: released
Operating Manual
rev. 01, 03.11.08
8
CONTROLLING OTHER DEVICES WITH A NEC
One of the nice features of the ES10/ES26 transmitters with embedded SNMP-proxy-agent and
Webserver (NEC) is, that also additional BKtel equipment can be managed or monitored through
this circuitry either
•
via the push-buttons / LCD field of the ES10/ES26
•
the Webserver (HTTP)
•
SNMP interface.
In order to use this function, additional BKtel equipment has to be connected to the RS485
(master) interface of the NEC by using a standard RJ-45 patch cable. All BKtel subracks
(BBT001 … 003) provide two RJ-45 sockets located on the interface card on the right hand side
of the subrack. Other BKtel 19”-1RU devices (EDFAs and optical switches) provide two RS485
slave interfaces on the rear side of the equipment. The two RS 485 interfaces are typically used
for daisy chaining the RS485 interface bus.
There are some limitations to be considered for a proper functioning of the EMS-server:
1. Physical limitations: For the RJ-45 cable a CAT6 or better data cable is recommended.
The length of the cable should be chosen as short as possible. A distance of 10 m should
not be exceeded anyway.
2. General limitations: A maximum of 48 devices can be managed by one NEC.
3. In order to get a correct display of the “rackview” function of the NEC, there are 2 more
limitations required:
•
All devices to be managed by one NEC have to be positioned in one rack (and on one
side of the rack if the rack is equipped with equipment from both sides).
•
A maximum of four subracks can be used. The address of all subracks have to be set
correctly by adjusting the decimal switches located on the interface panel of the
subracks. Adress “1” has to be used for the upper subrack, the next following subrack will
obtain address “2” and so on.
After powering up, the NEC will poll all equipment connected to the RS485 interface
automatically. It might take up to about 2 minutes until all equipment have been identified. This is
also true if equipment is removed or added during normal operation of the NEC.