MINI-LINK 6692 Hardware
Description
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Copyright
© Ericsson AB 2017–2019. All rights reserved. No part of this document may be
reproduced in any form without the written permission of the copyright owner.
Disclaimer
The contents of this document are subject to revision without notice due to
continued progress in methodology, design and manufacturing. Ericsson shall
have no liability for any error or damage of any kind resulting from the use of this
document.
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Contents
Contents
1 MINI-LINK 6692 1
1.1 NPU Protection 1
1.2 PFU 1201 2
1.3 FAU 1201 2
1.4 Backplane Architecture 3
1.5 Hardware Handling 4
1.6 Input Voltage Behavior 6
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MINI-LINK
1 MINI-LINK 6692
MINI-LINK 6692 is suitable for end site and repeater site applications as well as
medium-sized hub sites or prioritized small-sites.
MMU 1002
MMU 1002
1201
PFU
1002
NPU
1002
NPU
FAU 1201
MMU 1002
1001
LTU
Figure 1 MINI-LINK 6692
MINI-LINK 6692 consists of a rack, Enclosure 1201, that must be equipped with
a fan, FAU 1201, and a power filter, PFU 1201.
MINI-LINK 6692 can also be equipped with one or two NPU 1002s, and up to
eight MMU 1001/1002, LTU 1001/1002, or a combination thereof. LTU 1001
provides E1/DS1 interfaces for PDH, and LTU 1002 provides E1 and STM-1
interfaces for PDH and SDH. MINI-LINK 6692 can also be equipped with ETU
1001/1002, which provides additional Ethernet interfaces.
To achieve NPU protection, two NPU 1002s have to be used. See NPU Protection.
Unused slots in MINI-LINK 6692 must be equipped with Dummy Units, as this is
essential to maintain the cooling within the magazines and to meet EMC
requirements.
MINI-LINK 6692 can be fitted in a standard 19" or metric rack or on a wall using
a dedicated mounting set. The height of a MINI-LINK 6692 is 3U.
1.1 NPU Protection
When two NPU 1002s are inserted into MINI-LINK 6692, NPU Protection can
provide board, port, and full functional redundancy for the NPU, if configured and
licensed properly.
In case of a hardware or software fault in the Master NPU, an automatic failover
takes place, and the Slave NPU becomes the Master by inheriting all
configuration. All user traffic and DCN access recovers after the failover.
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MINI-LINK 6692 Hardware
The front LAN ports of the Slave NPU can be extended and configured to be used
for user traffic. This way the extended ports can have different configuration
than the corresponding port of the Master NPU and can be used in different
setup. After failure or switchover, the configuration remains on each port, but the
ports of the new Slave NPU are handled as extended.
1.2 PFU 1201
Power handling and filtering is performed by the Power Filter Unit (PFU) 1201,
see Figure 2.
1201
PFU
Figure 2 PFU 1201
To achieve redundant power, two PFU 1201 are needed, and two power sources,
one connected to each PFU 1201.
1.2.1 System Monitoring
The PFU supports the monitoring of the node power consumption by measuring
the input current and voltage on the incoming −48V.
The following can be read:
— The current values of input voltage and the power consumption of the node.
— The accumulated and persistently stored energy consumption of the node.
1.3 FAU 1201
Air-cooling is provided by the FAU 1201, see Figure 3.
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FAU 1201
Figure 3 FAU 1201
FAU 1201 has an automatic fan speed control and houses two internal fans.
Air out
MMU 1002
MMU 1002
1201
PFU
Air in
1002
NPU
FAU 1201
MMU 1002
1001
LTU
Figure 4 Cooling Airflow in MINI-LINK 6692
The air enters at the right side of the enclosure and exits at the left side of the
enclosure.
1.4 Backplane Architecture
MINI-LINK 6692 provides high-speed connections of up to 10 Gbps between the
NPUs, MMUs, ETUs, and LTUs. The available traffic capacity is dependent on the
board types and their position in the enclosure.
The MMUs, LTUs, and ETUs are placed in the Application Plug-in Unit (APU)
slots, that is, slots 1–2, 5–8, and 11–12.
Slot Ethernet capacity Slot Ethernet capacity [Gbps]
[Gbps]
6 1×2.5 + 1×1 12 1×2.5 + 1×1
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MINI-LINK 6692 Hardware
Slot Ethernet capacity Slot Ethernet capacity [Gbps]
[Gbps]
5 2×2.5 11 2×2.5
2 1×10 or 4×2.5 8 1×10 or 4×2.5
1 2×2.5 7 1×2.5
The following pairs of slots are interconnected (2-BPI) in the MINI-LINK 6692
backplane and can be used for Modem Equipment Protection (EQP):
— Slot 1 and 2
— Slot 5 and 6
— Slot 7 and 8
— Slot 11 and 12
NPUs are allocated in slot 9 and 10. Slot 9 is the Primary, slot 10 is the Secondary
NPU slot.
00
06 Slot 6 Slot 12 12
Pair
Pair
11
05 Slot 5 Slot 11
04 Slot 4 Slot 10 10
Slot 0
03 Slot 3 Slot 9 09
02 Slot 2 Slot 8 08
Pair
Pair
MINI-LINK
01 Slot 1 Slot 7 07
6692
Figure 5 Interconnected slots in MINI-LINK 6692
1.5 Hardware Handling
The system offers several functions for easy operation and maintenance.
— Plug-in units can be inserted while the NE is in operation. This enables
adding of new Radio Terminals or other plug-in units without disturbing
existing traffic.
— Plug-in units other than the NPU can be removed while the NE is in
operation.
— When replacing a faulty plug-in unit, the new plug-in unit automatically
inherits the configuration of the old plug-in unit. Also, the APU SW load
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modules are stored on the NPU, enabling replacement of for example MMUs
without using an FTP server.
— The configuration file is stored non-volatile both on the RMM and in a flash
memory on the NPU, and can also be backed up and restored using a local or
central FTP server. The RMM storage thus enables NPU replacement without
using an FTP server, unless the NPU SW load module needs to be updated.
— The backplane in all subracks has a digital serial number which is also stored
on the RMM of the NPU. When inserting an NPU, for example, as a
replacement, the serial numbers are compared on power up.
— Various restarts can be ordered from the management system. A cold restart
can be initiated for an NE or single plug-in unit, and this type of restart
disturbs the traffic. A warm restart is only available for the whole NE, and
this restarts the control system and does not affect the traffic, which is
possible due to the separated control and traffic system.
— All plug-in units are equipped with temperature sensors. Overheated boards
that exceed limit thresholds are put in out of service by the control system.
This is to avoid hardware failures in case of over-temperature, for example,
due to a fan failure or an ambient temperature that is too high. The plug-in
unit is automatically returned to normal operation when the temperature is
below the high threshold level.
There are two thresholds:
• The high temperature threshold:
The NPU raises a temperature alarm (critical). The NPU is still in full
operation.
All plug-in units except NPUs raise a temperature alarm (minor). The
plug-in unit is still in full operation.
• The excessive temperature threshold:
The NPU shuts down the entire NPU (out of service).
All plug-in-units except NPUs raise a temperature alarm (critical) and
shut down the entire plug-in unit (out of service).
— Access to inventory data like software and hardware product number, serial
number, and version. User defined asset identification is supported, enabling
tracking of hardware.
— Slot availability and capacity can be monitored by using MINI-LINK Node
GUI or CLI. In this way, choosing a slot for additional plug-in units is easier.
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1.6 Input Voltage Behavior
Figure 6 shows the input voltage behavior for MINI-LINK 6692. The different
units turn on and off at different voltages.
To prevent that the units turn on and off repeatedly around a threshold (so called
power flapping), there is a hysteresis for all units.
Figure 6 Start and Stop Voltages
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