Bosch DICENTIS, Руководство по установке оборудования

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Redundant cabling for DCNM‑APS/DCNM‑PS units
This section describes how to create redundant cabling for DCNM-APS or DCNM-PS units. The
maximum number of Ethernet devices in the loop (including the root switch) is 22. In a system
with no Ethernet switch(es), the APS is the root switch.
The total number of devices allowed in a loop depends on:
–
The type of device connected in the loop (for example, DCNM-MMD2 devices consume
more power than DCNM-DE devices).
– The length of the loop (cable also consumes power).
The figure shows how to calculate the number of devices in the loop. The red line shows the
largest loop. The # sign shows the way the devices are counted.
In the example below up to 21 discussion devices can be connected.
1
2
3
3
#1
#2 #22
Figure 4.6: DICENTIS devices connected with redundant cabling to the same DCNM-APS / DCNM-PS type
unit
1: DCNM-APS or DCNM-PS.
2: DICENTIS devices.
3: DICENTIS cabling (redundant loop).
Cabling possibilities (DCNM‑APS/DCNM‑PS) Limitations/requirements
Connect the DICENTIS devices in a daisy
chain configuration from a high power socket
on a DCNM-PS or DCNM-APS to another high
power socket on the same DCNM-PS or
DCNM-APS. The redundancy is for cable only. If the
DCNM-PS or DCNM-APS fails, all DICENTIS
devices connected to that unit will also fail.
If a single DICENTIS device fails, the other
DICENTIS devices in the daisy chain will
continue to work.
To enable redundancy, Rapid Spanning Tree
Protocol (RSTP) must be enabled.
You can use any of the high power sockets (3,
4, or 5) to create the daisy chain. The redundant loop must be connected to
the same DCNM-APS or same DCNM-PS.
See also
–
Power supply capacity calculation plan, page 17
4.4.1
22 en | System installation design and planning DICENTIS
2016.09 | V1.4 | Hardware Installation Manual Bosch Security Systems B.V.