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MINI-LINK 6351

Ericsson MINI-LINK 6351 Technical Description

PRELIMINARY
Technical Description
MINI-LINK 6351
DESCRIPTION
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Copyright
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 Introduction 1
2 Scenarios 3
3 Radio Link Functions 5
3.1 Adaptive Coding
and Modulation 5
3.2 Transmit Power Control 7
3.3 Maximizing Radio Link Throughput 8
3.4 Radio Link Compatibility 9
4 Ethernet Functions 11
4.1 Ethernet in Microwave Networks 11
4.2 Ethernet Capacity 12
4.3 Ethernet Services 13
4.4 Quality of Service 20
4.5 Ethernet Protection 26
4.6 Delay 26
4.7 Ethernet Operation and Maintenance 26
5 Synchronization Functions 31
5.1 Network Synchronized Mode 31
5.2 Network Synchronization Methods 32
6 Hardware 33
7 Management 35
7.1 DCN 35
7.2 Management Tools and Interfaces 36
7.3 Configuration Management 41
7.4 Fault Management 41
7.5 Performance Management 42
7.6 Hardware Management 44
7.7 Software Management 44
7.8 License Management 44
7.9 Security Management 45
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Technical Description
8 Accessories 51
8.1 Power Over Ethernet 51
8.2 Alignment Camera 53
8.3 Commissioning Guide 53
9 Technical Specifications 55
9.1 Power Supply Requirements 55
9.2 Power Consumption 55
9.3 Dimensions and Weight 55
10 Federal Communications Commission and Industry
Canada Notices 57
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Introduction
1 Introduction
MINI-LINK 6351 is a complete all-outdoor microwave packet radio with the capability of handling Ethernet traffic using frequencies in the 59–62 GHz range.
17252
MINI-LINK 6351
Figure 1 MINI-LINK 6351
The packet radio has the following interfaces:
•
One interface for Power over Ethernet (1GE)
• One RJ45 interface for local management
The hardware is described in Section 6 on page 33.
Some functions described in this document are subject to license handling, that is, a soft key is required to enable a specific function.
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Scenarios
2 Scenarios
DC -48V 2A MAX
+ DC:2 - + DC:1 -
ERICSSON
MINI-LINK SP 110
Fault
Power
Oper
Sync
USB O&M O&MSYNC 2
USER I/OSYNC 1
1 1 2 3 4 TR:1A-1B TR:2A-2BTR:3A-3B TR:4A-4B3
2
10/100/1000 Base-T / 100/1000 Base-X
4
10/100/1000 Base-T
E1 / DS1
DC -48V 2A MAX
+ DC:2 - + DC:1 -
ERICSSON
MINI-LINK SP 110
Fault
Power
Oper
Sync
USB O&M O&MSYNC 2
USER I/OSYNC 1
1 1 2 3 4 TR:1A-1B TR:2A-2BTR:3A-3B TR:4A-4B3
2
10/100/1000 Base-T / 100/1000 Base-X
4
10/100/1000 Base-T
E1 / DS1
17258
PCU1
TRX
CBN
Air guide plate
FAU1
TN
FAU1
Cable shelf
Micro RBS
Microwave
Multiple RBSs
Multi standard
RBS6000/TCU
4G
3G
4G
2G
3G
2G
4G
Packet Terminal
Packet Terminal
Packet Terminal
Ericsson SP
MINI-LINK LH
Packet Terminal
Towards HRAN/Metro
MINI-LINK TN
Packet Terminal
Packet Terminal
Ericsson SP
Enterprise
Packet Terminal
Figure 2 Network Scenario Overview
Using the MINI-LINK product portfolio to build an Ethernet network means that there is a broad range of alternatives to choose from. There is support for high-capacity Ethernet transport with different bandwidth and capacity options over both radio and fixed connections.
The products offer the size and capacity to meet the needs of both last mile access and first aggregation point, in a mobile backhaul network.
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Technical Description
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Radio Link Functions
3 Radio Link Functions
The packet radio operates within the 59–62 GHz frequency range, using 4, 16, 32, 64, 128, or 256 QAM, also supporting Adaptive Coding and Modulation (ACM).
3.1
Adaptive Coding and Modulation
Adaptive Coding and Modulation (ACM) enables automatic hitless switching between different ACM profiles, depending on radio channel conditions. Hitless ACM makes it possible to increase the available capacity over the same frequency channel during periods of normal propagation conditions.
Code rate and modulation (and thereby capacity) are high during normal radio channel conditions and lower during less favorable channel conditions, for example, when affected by rain or snow. ACM profile switches are hitless, that is, error free. In situations where traffic interruption normally would occur, it is possible to maintain parts of the traffic by switching to a lower ACM profile, using hitless ACM.
Figure 3
shows how the capacity changes when the received input signal
crosses the receiver threshold for each ACM profile.
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Figure 3 Principles of Adaptive Coding and Modulation
When using only Adaptive Modulation, the steps in
Figure 3
only differ in terms of modulation. When using ACM, the steps can differ in both coding and modulation, which increases the number of possible steps.
In order to handle channel variations, the channel conditions are continuously monitored on the Rx side by measurement of Signal to Noise and Interference Ratio (SNIR). When the receiver, based on this data, detects that channel conditions imply a change to the next higher or lower ACM profile, a message is sent to the transmitter on the other side requesting a higher or lower ACM profile. Upon receipt of such request the transmitter starts transmitting with the new ACM profile. Each direction is independent. At demodulation the receiver follows the ACM profile as a slave.
The ACM profile can also be configured with the maximum ACM profile equal to the minimum ACM profile, and thereby achieving a mode comparable to static mode, where the ACM profile remains unchanged.
Hitless ACM is compatible with Automatic Transmit Power Control (ATPC), which is working in a closed loop only in the highest configured ACM profile. In lower ACM profiles the output power is set as high as possible.
Note: Hitless ACM requires a license.
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Radio Link Functions
Buffering
ACM can influence the design of the buffer dimensioning. In case packet aging is not used, the maximum delay variation time will increase due to that the buffer is configured in bytes and that data will travel at a slower speed during lower ACM profile steps. When packet aging is enabled, the maximum delay variation time will be kept regardless of ACM profile level. This will also ensure that there is no old data in lower priority queues when the ACM profile is increased after a fading situation.
ACM can influence the position of the narrowest congestion point in the network, with too small buffers this can have a strong negative impact on utilization and end user TCP performance. To ensure high link utilization and high TCP performance, buffers for TCP traffic should be dimensioned in the area above average Round Trip Time (RTT), which is typically in the area of 100–200 ms.
3.2 Transmit Power Control
The radio transmit power can be controlled in Automatic Transmit Power Control (ATPC) mode, including setting of associated parameters. In Automatic Transmit Power Control (ATPC) mode the transmit power can be increased rapidly during fading conditions and allows the transmitter to operate at less than the maximum power during normal path conditions. The normally low transmit power allows more efficient use of the available spectrum while the high transmit power can be used as input to path reliability calculations, such as fading margin and carrier-to-interference ratio.
The transmitter can be turned on or off from the management system.
P
out
P
Transmit power
min
P
max
16707
ATPC mode
Figure 4 Transmit Power Control
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Technical Description
ATPC is used to automatically adjust the transmit power P
out
in order to maintain the received input level at the far-end radio at a target value. The received input level is compared with the target value, a deviation is calculated and sent to the near-end to be used as input for possible adjustment of the transmit power.
In ATPC mode, the transmit power P
out
varies between a selected maximum
level P
max
and a minimum level P
min
.
ECO mode is supported, and when ATPC mode is configured it is possible to achieve a power consumption reduction with maintained performance.
3.3 Maximizing Radio Link Throughput
The maximum bit rate of incoming traffic on the LAN interface can be significantly higher than the maximum bit rate over the radio link. For the radio link to match the frame rate on the LAN interface, it is necessary to increase the throughput on the radio link. This is done by stripping the IFG (interframe gap) and preamble, and optionally by using multilayer header compression on the Ethernet frames.
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Layer Preamble
Start of frame
delimit er
MAC
desti nation
MAC
source
802.1Q tag (optional)
Ethert ype Payl oad
Frame chec k
sequence
IFG
Layer 2 Et hernet
frame
Layer 1 Et hernet
packet
Figure 5 Ethernet Packet and Frame Structure
Stripping the Preamble, SFD, and IFG
On the LAN side, the Layer 2 Ethernet data is encapsulated by a Layer 1 header consisting of an Preamble sequence, an SFD and an IFG. The IFG, preamble and SFD are not needed in the traffic sent over the radio link. The IFG and preamble are stripped from the packet, leaving only the Ethernet Layer 2 frame. A small overhead is added to the frame before it is sent over the radio link. This way the traffic over the radio link consists almost entirely of the payload, making it possible for the radio link to keep the same frame rate as the LAN interface, even though the bit rate is lower.
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Radio Link Functions
Multi-Layer Header Compression
To further increase the frame rate over the radio link, Multi-Layer Header Compression (MLHC) is used on the Ethernet frame. Fields in the header are converted to a hash number, potentially resulting in a significant reduction in the size of the frames sent over the radio link.
The MLHC algorithm inspects the header for Ethernet, IPv4, IPv6, UDP, MPLS (up to three MPLS labels) and MPLS pseudowire information. See Table 1 for examples of traffic throughput gain (in percent) for different frame types and frame sizes when using MLHC:
Table 1 Traffic Throughput Gain for Different Frame Types when using MLHC
Frame Size (Bytes)
Frame Type
64 128 512
1500
Eth+S-tag+C
-tag
42% 18%
4% 1%
Eth+S-tag+C
-tag+IPv4+U DP
143% 43%
8% 3%
Eth+S-tag+C
-tag+IPv6+U DP
N/A
88%
13% 4%
Eth+ MPLS+I Pv4
89% 32% 7% 2%
Eth+C-tag+S
-tag+3*MPLS +L2 PW
278% 61% 10% 3%
Eth+C-tag+S
-tag+3*MPLS +L3 PW
N/A
100% 14% 4%
3.4 Radio Link Compatibility
MINI-LINK 6351 is only hop compatible with another MINI-LINK 6351.
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Technical Description
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Ethernet Functions
4 Ethernet Functions
The packet radio is targeting multiple applications and network environments with the embedded Ethernet capabilities. For information about the supported Ethernet services, see Section 4.3 on page 13.
In addition to the Ethernet functions described in the following sections, the following related functions are also available:
•
Synchronous Ethernet
, see
Section 5.2 on page
31.
• Ethernet Performance Counters
, see
Section 7.5.3 on page
43.
4.1
Ethernet in Microwave Networks
Compared to other transmission technologies, a microwave link can be characterized as a limited bandwidth connection. This implies that microwave equipment must be designed to enable maximum packet payload throughput in the available bandwidth over the radio interface. The following features improve the link efficiency:
Quality of Service
For connections with limited bandwidth it is important to prioritize high priority packets when a connection is congested.
Adaptive Modulation
Adaptive modulation seeks continuously to use the modulation alternatives that will maximize throughput under different conditions.
Low Residual BER
Microwave links operate with large fade margins and forward error correction resulting in low residual BER level, typically 10
-12
.
Header Compression
The maximum bit rate of incoming traffic on the LAN interface can be significantly higher than the maximum bit rate over the radio link. To maximize the throughput on the radio link, parts of the Ethernet frame is removed and the remaining headers are compressed before it is sent over the radio link.
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Ethernet WAN Buffer
The WAN port buffer has been designed to handle burst and congestion in order to provide a high link utilization and goodput for high-speed data traffic.
Since extensive buffering has a negative impact on frame delay variation, it is important to have the possibility to configure buffer/queue size for different traffic classes independently.
This means that queues configured to handle delay variation sensitive traffic such as synchronization traffic, shall be configured to be very short.
In contrast, for traffic queues for less delay variation sensitive traffic the Transmission Control Protocol/Internet Protocol (TCP/IP) has a congestion avoidance mechanism that is based on buffer utilization. In order to provide a high link utilization and high TCP goodput, queues configured to handle this type of traffic needs to be in the area of hundreds of milliseconds at the smallest congestion point, equivalent to the network end-to-end Round-Trip time.
LAN port buffers are designed to be very small in order to keep delay variation as small as possible, whereas WAN port buffers are larger, to enable handling of congestion at the WAN port. Congestion at the WAN port can occur when the WAN port link speed is lower than the LAN port link speed.
4.2 Ethernet Capacity
The ethernet capacity depends on the configuration of the NE.
Table 2 Ethernet Capacity
ACM Profile
CS (MHz) ACM
Layer 1 Line Capacity (Mbps)
64 QAM
1000
32 QAM
1000
16 QAM
981
250
4 QAM
490
128 QAM
1000
64 QAM
1000
32 QAM
980
16 QAM
784
200
4 QAM
391
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Ethernet Functions
ACM Profile
CS (MHz) ACM
Layer 1 Line Capacity (Mbps)
128 QAM
1000
64 QAM
869
32 QAM
724
16 QAM
579
150
4 QAM
289
256 QAM
770
128 QAM
673
64 QAM
578
32 QAM
481
16 QAM
385
100
4 QAM
191
256 QAM
382
128 QAM
334
64 QAM
286
32 QAM
238
16 QAM
190
50
4 QAM
95
4.3 Ethernet Services
Ethernet services according to MEF (Metro Ethernet Forum) specifications are supported. Figure 6 shows a basic model for Ethernet services. The Ethernet service is provided by Metro Ethernet Network (MEN) provider. The Customer Edge (CE) and MEN exchange service frames across the User Network Interface (UNI).
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Metro Ethernet Network
User network interface
UNI
User network
interface
UNI
Customer
Edge
Customer
Edge
12530
Figure 6 Ethernet Service Model
Based on Ethernet Virtual Connections (EVCs), the following service types are supported:
• Point-to-Point EVC:
0
Ethernet Private Line (EPL) service
0
Ethernet Virtual Private Line (EVPL) service
•
Multipoint-to-Multipoint EVC:
0
Ethernet Private LAN (EPLAN) service
0
Ethernet Virtual Private LAN (EVPLAN) service
The LAN port can be used as a UNI, supporting up to 16 EVCs.
4.3.1 Ethernet Virtual Connection
An EVC is an instance of an association of two or more UNIs. It performs two functions:
• Connects two or more customer sites (UNIs) enabling the transfer of Ethernet service frames between them. The rules under which a service frame is delivered to the destination UNI are specific to the particular service definition.
• Prevents data transfer between customer sites that are not part of the same EVC.
Two types of EVCs are supported:
•
Point-to-Point EVC (E-Line)
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Ethernet Functions
• Multipoint-to-Multipoint EVC (E-LAN)
Point-to-Point EVC (E-Line)
In a Point-to-Point EVC, also known as E-Line, exactly two UNIs are associated with one another through the EVC. Service frames are transferred between them. Figure 7 illustrates two Point-to-Point EVCs.
Metro Ethernet Network
EVC1
Customer
Edge
Customer
Edge
EVC2
Customer
Edge
12566
Figure 7 Point to Point EVC
Multipoint-to-Multipoint EVC (E-LAN)
In a Multipoint-to-Multipoint EVC, also known as E-LAN, two or more UNIs are associated with one another through the EVC. It allows unicast, broadcast and multicast service frames to be transferred from one ingress UNI to one or more egress UNIs.
Figure 8 illustrates a Multipoint-to-Multipoint EVC.
Metro Ethernet Network
Customer
Edge
Customer
Edge
Customer
Edge
12567
Figure 8 Multipoint to Multipoint EVC
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