Redline Communications AN-30e User manual

70-00035-01 Proprietary Redline Communications © 2004 November 16, 2004
Page 1 of 103
AN-30e PTP System
User Manual

AN-30e
user manual
70-00035-01 Proprietary Redline Communications © 2004 November 16, 2004
Page 2 of 103
Copyright Information
All rights reserved June 2004. The information in this document is proprietary to
Redline Communications Inc. This document may not in whole or in part be copied,
reproduced, or reduced to any medium without prior consent, in writing, from Redline
Communications Incorporated.
Copyright © 2004 Redline Communications Inc.
Contact Information Redline Communications Inc.
302 Town Centre Blvd.
Markham, ON
Canada L3R 0E8
Web site: http://www.redlinecommunications.com
Sales Inquiries:
North American
Toll-free sales line
International
[email protected]
1-866-633-6669
[email protected]
Support:
Email
Telephone
[email protected]
Contact your Redline Distributor
Product Registration http://www.redlinecommunications.com
Click Support
User ID: Register
Password: Redline
Disclaimer
The statements, configurations, technical data, and recommendations in this
document are believed to be accurate and reliable, but are presented without
express or implied warranty. Additionally, Redline makes no representations or
warranties, either expressed or implied, regarding the contents of this product.
Redline Communications shall not be liable for any misuse regarding this product.
The information in this document is subject to change without notice.
70-00035_01_AN_30e_UserMan-041111a.doc

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TABLE OF CONTENTS
1Important Safety & Service Notices....................................................... 9
1.1 Safety Warnings ........................................................................................ 9
1.2 Important Warning Symbols .................................................................... 10
1.3 Important Service Information ................................................................. 10
1.4 FCC Notice .............................................................................................. 11
1.5 UL Information ......................................................................................... 12
1.6 CE Notice ................................................................................................ 12
1.7 Lightning Protection................................................................................. 13
1.8 Product Information ................................................................................. 14
2Getting Started....................................................................................... 15
2.1 Terms Used in this Manual...................................................................... 16
3System Overview................................................................................... 17
3.1 TDM over Wireless .................................................................................. 18
3.1.1 Theory of Operation............................................................................. 18
3.1.2 TDM Configuration .............................................................................. 18
4Physical Description ............................................................................. 21
4.1 Quick Install Guide .................................................................................. 21
4.2 Unpacking the AN-30e ............................................................................ 21
4.3 AN-30e Terminal ..................................................................................... 22
4.3.1 Mounting.............................................................................................. 22
4.3.2 Power Supply ...................................................................................... 22
4.3.3 Time Synchronization Port .................................................................. 22
4.3.4 Wireless Section.................................................................................. 22
4.3.5 Ethernet Section .................................................................................. 24
4.3.6 System Section.................................................................................... 26
4.3.7 The TDM Interface............................................................................... 27
4.4 System Radio .......................................................................................... 29
4.4.1 Transceiver.......................................................................................... 29
4.4.2 IF Port (Radio Control) ........................................................................ 29
4.4.3 RF Connector ...................................................................................... 29
4.4.4 Alignment Pin and Audible Signal........................................................ 29
4.4.5 Antenna ............................................................................................... 29
4.4.6 Antenna Mounting Bracket .................................................................. 30
5Using the Web Interface........................................................................ 31
5.1 System Menu........................................................................................... 31
5.2 General Information................................................................................. 33
5.2.1 System................................................................................................. 33
5.2.2 Ethernet: .............................................................................................. 34
5.2.3 Wireless:.............................................................................................. 34
5.3 System Status ......................................................................................... 35
5.3.1 General Information:............................................................................ 35
5.3.2 Ethernet LAN Statistics:....................................................................... 36
5.3.3 Wireless Statistics: .............................................................................. 36
5.3.4 Statistics Control Button: ..................................................................... 36

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5.4 System Logs............................................................................................ 37
5.5 Configure System .................................................................................... 38
5.5.1 Ethernet Configuration:........................................................................ 38
5.5.2 Wireless Configuration: ....................................................................... 41
5.5.3 System Configuration Buttons ............................................................. 46
5.6 Upload Software ...................................................................................... 47
5.7 Product Options....................................................................................... 48
5.7.1 Entering Option Keys........................................................................... 48
5.7.2 TDM Options ....................................................................................... 48
5.7.3 Ethernet Options.................................................................................. 48
5.8 System Password Screen ....................................................................... 49
5.9 TDM Configuration Settings .................................................................... 50
5.9.1 How to Use Apply and Save................................................................ 51
5.9.2 TDM Config - General Settings............................................................ 52
5.9.3 TDM Config - Port Settings.................................................................. 54
5.9.4 TDM Config - Bundle Selection ........................................................... 56
5.9.5 TDM System Configuration Control Buttons........................................ 59
5.10 TDM Statistics ......................................................................................... 60
5.10.1 TDM Statistics - Port Selection............................................................ 60
5.10.2 TDM Statistics - Statistics Screen........................................................ 61
6TDM Over Wireless................................................................................ 63
6.1 Bandwidth Requirements ........................................................................ 63
6.1.1 Maximum Uncoded Burst Rates .......................................................... 63
6.1.2 Evaluating TDM Throughput Requirements ........................................ 64
6.1.3 Mobility Networks ................................................................................ 64
6.1.4 Enterprise Networks ............................................................................ 65
6.1.5 Evaluating Ethernet Throughput.......................................................... 67
6.1.6 Clock Synchronization ......................................................................... 68
7Diagnostics and Troubleshooting ....................................................... 69
7.1 Factory Default Settings .......................................................................... 69
7.2 Troubleshooting the Web Interface ......................................................... 70
7.3 Troubleshooting The RF.......................................................................... 71
7.4 System Error Log Messages ................................................................... 73
7.5 Replacing System Fuse........................................................................... 75
8Appendix ................................................................................................ 77
8.1 System Specifications ............................................................................. 77
8.2 DC Power Supply Cable Connections..................................................... 80
8.3 Antenna and Power Specifications.......................................................... 81
8.3.1 T-58 Radio: Antenna Power Specifications ......................................... 81
8.3.2 T-54 Radio: Maximum RF Power vs. Antenna Gain............................ 82
8.3.3 T-54 Radio: Operational Power (FCC) ................................................ 83
8.4 CLI Interface ............................................................................................ 84
8.4.1 Console (RS-232) Port ........................................................................ 84
8.4.2 Connecting via Telnet .......................................................................... 85
8.4.3 CLI Commands.................................................................................... 85

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8.4.4 Sample TDM CLI Setup Scripts........................................................... 95
8.5 About SNMP............................................................................................ 99
8.6 Glossary Of Terms ................................................................................ 100

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LIST OF TABLES
Table 1: Terms .................................................................................................... 16
Table 2: Wireless Link Diagnostics ..................................................................... 23
Table 3: Wireless Signal Diagnostics .................................................................. 24
Table 4: terminal LAN Ethernet Port Pinout ........................................................ 24
Table 5: Ethernet Link/Act Diagnostics ............................................................... 25
Table 6: Ethernet 100 Diagnostics ...................................................................... 25
Table 7: Ethernet Collision Diagnostics............................................................... 26
Table 8: System Power Diagnostics.................................................................... 26
Table 9: Front Panel Reset Switch...................................................................... 27
Table 10: TDM Port RJ-48 Pinout ....................................................................... 27
Table 11: TDM RJ-48 CPE Connection Cable .................................................... 28
Table 12: TDM Port Alarm Condition LEDs......................................................... 28
Table 13: Web Screens....................................................................................... 32
Table 14: Default System Users.......................................................................... 32
Table 15: CE: RF Channel Frequencies ............................................................. 43
Table 16: UK: RF Channel Frequencies ............................................................. 43
Table 17: North America: RF Channel Frequencies ........................................... 43
Table 18: Default Bundle Numbers ..................................................................... 58
Table 19: Achievable Uncoded Burst Rate (Mbps) ............................................. 63
Table 20: Wireless Link Bandwidth Requirements for E1 ................................... 64
Table 21: Wireless Link Bandwidth Requirements for T1 ................................... 64
Table 22: Mobility Backhaul Operating Characteristics....................................... 65
Table 23: AN-30e Operating Settings -- Mobility Backhaul ................................. 65
Table 24: Enterprise Backhaul Latency Requirements ....................................... 66
Table 25: Enterprise Backhaul Operating Parameters........................................ 66
Table 26: AN-30e Operating Settings -- Enterprise Backhaul............................. 66
Table 27: Data Rates Available when Using E1.................................................. 67
Table 28: Data Rates Available when Using E1.................................................. 67
Table 29: Stratum Clock Definitions .................................................................... 68
Table 30: Factory Default Settings ...................................................................... 69
Table 31: Web Interface Diagnostics .................................................................. 70
Table 32: RF Errors............................................................................................. 71
Table 33: RF Status Error Codes ........................................................................ 72
Table 34: System Log Messages ........................................................................ 73
Table 35: AN-30e Technical Specifications......................................................... 77
Table 36: DC Power Supply Cable Connections................................................. 80
Table 37: T-58 Radio: Antenna Power Specifications......................................... 81
Table 39: 5.4 GHz Band RF Power vs. Antenna Gain ........................................ 82
Table 40: 5.4 GHz -- Antenna Gain vs. Max. Op. Power .................................... 83
Table 41: Console (RS-232) Port Pinout............................................................. 84
Table 42: CLI - General Commands ................................................................... 86
Table 43: CLI - General Information Commands ................................................ 87
Table 44: CLI - System Status ............................................................................ 87
Table 45: CLI - System Configuration ................................................................. 88

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Table 46: CLI - TDM General Commands........................................................... 91
Table 47: CLI - TDM Set and Get Commands .................................................... 91
Table 48: CLI - TDM Serial Interface Commands ............................................... 92
Table 49: CLI - TDM DS0 Bundle Commands .................................................... 92
Table 50: CLI - TDM General Statistics Commands ........................................... 92
Table 51: CLI - TDM Ethernet Statistics Commands .......................................... 93
Table 52: CLI - TDM Statistics ............................................................................ 93
Table 53: TDM Save Command Error Codes ..................................................... 94
Table 54: E1 Framed Configuration Script .......................................................... 95
Table 55: T1 Framed Configuration Script .......................................................... 97
Table 56: Glossary of Terms ............................................................................. 100

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LIST OF FIGURES
Figure 1: AN-30e System: Terminal, Transceiver, and Antenna......................... 15
Figure 2: AN-30e terminal ................................................................................... 17
Figure 3: AN-30e Ethernet/TDM Transport ......................................................... 18
Figure 4: AN-30e Multi-Hop Deployment Example ............................................. 20
Figure 5: Front Panel - Wireless LEDs................................................................ 23
Figure 6: RJ-45 Jack Face .................................................................................. 24
Figure 7: Front Panel: Ethernet LEDs ................................................................. 24
Figure 8: Front Panel: Reset Switch and System LEDs...................................... 26
Figure 9: Transceiver .......................................................................................... 29
Figure 10: One-Foot Flat Antenna....................................................................... 30
Figure 11: On-Screen Menu................................................................................ 31
Figure 12: General Information Screen ............................................................... 33
Figure 13: System Status Screen........................................................................ 35
Figure 14: System Logs Screen .......................................................................... 37
Figure 15: System Configuration Screen - Ethernet Settings.............................. 38
Figure 16: System Configuration Screen - SNMP Access .................................. 39
Figure 17: SNMP Configuration Screen .............................................................. 40
Figure 18: SNMP Community/Trap Settings Screen........................................... 41
Figure 19: System Configuration Screen - Wireless Settings ............................. 42
Figure 20: Upload Software Screen .................................................................... 47
Figure 21: AN-30e Product Options Screen........................................................ 48
Figure 22: System Password Screen .................................................................. 49
Figure 23: TDM System Configuration Screen.................................................... 50
Figure 24: TDM Editing Steps ............................................................................. 51
Figure 25: TDM General Configuration Settings ................................................. 52
Figure 26: TDM IP Address Settings................................................................... 53
Figure 27: TDM Port Configuration Settings ....................................................... 54
Figure 28: TDM Port Editing Screen ................................................................... 54
Figure 29: TDM Loopback: Local Mode .............................................................. 55
Figure 30: TDM Loopback: Subscriber Mode...................................................... 55
Figure 31: TDM Loopback: Payload Mode.......................................................... 56
Figure 32: TDM Bundle Selection ....................................................................... 56
Figure 33: TDM Bundle Editing Screen............................................................... 57
Figure 34: TDM Bundle Editing Dialog Box......................................................... 59
Figure 35: TDM Properties/Statistics Screen ...................................................... 60
Figure 36: TDM Port Statistics Screen ................................................................ 61
Figure 37: AN-30e Mobility Backhaul Deployment.............................................. 65
Figure 38: AN-30e Enterprise Deployment ......................................................... 66
Figure 39: Fuse Holder........................................................................................ 75
Figure 40: Connecting via Telnet ........................................................................ 85
Figure 41: CLI Help Screen................................................................................. 85
Figure 42: TDM Configuration Files .................................................................... 90

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Chapter
1
1
1 I Im mp po or rt ta an nt t S Sa af fe et ty y & & S Se er rv vi ic ce e
N
No ot ti ic ce es s
1.1 Safety Warnings
- Read this User Manual and follow all operating and safety instructions.
- Keep all product information for future reference.
- This product is supplied with a grounding power plug. Do not defeat this important
safety feature.
- Power requirements are indicated on product-marking label. Do not exceed the
described limits.
- Always replace the fuse with the correct type and current rating.
- Position the power cord to avoid possible damage; do not overload wall outlets.
- Do not place this product on or near a direct heat source, and avoid placing objects
on the terminal.
- Do not operate this device near water or in a wet location.
- Use only a damp cloth for cleaning. Do not use liquid or aerosol cleaners.
Disconnect the power before cleaning.
- Protect the terminal by disconnecting the power if not used for long periods.
- Locate the terminal on a stable horizontal surface or mount it securely in a 19-inch
Telco rack.
- The radio transceiver units must not be located near power lines or other electrical
power circuits.
- The radio transceiver must be properly grounded to protect against power surges
and accumulated static electricity. It is the responsibility of the user to install this
device in accordance with the local electrical codes: correct installation procedures
for grounding of the transceiver unit, mast, lead-in wire and discharge unit,
location of discharge unit, size of grounding conductors and connection
requirements for grounding electrodes. It is recommended that the installation of
the transceiver be contracted to a professional installer.

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1.2 Important Warning Symbols
The following symbols may be encountered during installation or troubleshooting.
These warning symbols mean danger. Bodily injury may result if you are not aware
of the safety hazards involved in working with electrical equipment and radio
transmitters. Familiarize yourself with standard safety practices before continuing.
Electro-Magnetic
Radiation
High Voltage
1.3 Important Service Information
1. Refer all repairs to qualified service personnel. Do not remove the covers or
modify any part of this device, as this voids the warranty.
2. Disconnect the power to this product and return it for service if the following
conditions apply:
a) The terminal does not function after following the operating instructions
outlined in this manual.
b) Liquid has been spilled, a foreign object is inside, or the terminal has been
exposed to rain.
c) The product has been dropped or the housing is damaged.
3. Locate the serial number of the terminal, antenna, and transceiver and record
these on your registration card for future reference. Use the space below to affix
serial number stickers. Also record the MAC address, located on the back of the
terminal.

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1.4 FCC Notice
1. The System is used as a fixed wireless Ethernet bridge that requires professional
installation with specified antennas and output power levels certified under the
FCC Grant for System for point-to-point mode of operations.
2. FCC RF Exposure Requirements: T-54 and T-58: The antenna(s) used for these
radios must be fixed-mounted on outdoor permanent structures. In point-to-point
applications each antenna must be separated from all persons by a distance of at
least 2.5 meters. In point-to-multipoint applications each antenna must be
separated from all persons by a distance of at least 20 centimetres.
3. The System is certified by the FCC and Industry Canada with the 5.4/5.8 GHz
directional and parabolic antennas listed in the Appendix of this manual.
4. For fixed, point-to-point mode of operations, the transmitting antennas must be
directional as specified in this Users Manual; the use of omni-directional antenna
is prohibit for point-to-point operation.
5. For Class A Unintentional Radiators: This equipment has been tested and found to
comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required
to correct the interference at their expense.
6. Warning: Changes or modifications not expressly approved by Redline
Communications Inc. could void the authority of the user to operate the
equipment.

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1.5 UL Information
- The equipment must be properly grounded according with NEC and other local
safety code requirements
- Caution for all AC and DC models: Double Pole/Neutral Fusing.
- The DC source must be fused at Time Delay 2.5A, 250V.
- The DC input wiring must be minimum 18 AWG.
- The DC input source must be SELV.
- The DC input source must comply with local electrical codes.
- To meet the over voltage safety requirements on the telecommunications cables, a
minimum 26 AWG telecommunication line cord must be used.
- "Pour être en conformance avec les exigences finies de sûreté de sur-tension sur
les câbles de télécommunications un fil de télécommunication ayant un caliber
minimum de 26 AWG doit être utilisé."
- Reminder to all the BWA system installers: Attention to Section 820-40 of the
NEC which provides guidelines for proper grounding and, in particular, specifies
that the cable ground shall be connected to the grounding system of the building,
as close to the point of cable entry as is practical.
1.6 CE Notice
The AN-30e systems are CE certified for operation from 5.4 GHz to 5.8 GHz.
The transceiver and antenna equipment must be installed by a qualified professional
installer and must be installed in compliance with regional, national, and local
regulations. It is the responsibility of the system installer and/or system operator to
ensure the installed system does not exceed any operational constraints identified by local
regulations.
Refer to the product User Manual for detailed information about the correct installation
steps to ensure power and frequency settings are set correctly before connecting the
antenna.
Redline Communications Inc. wireless systems comply with the essential requirements of
the Directive 1999/5/EC. This product may be used in all EU countries (and other
countries following the EU directive 1999/5/EC) that have implemented nationally a
decision to allow use of the 5.8 GHz frequency band. Not all countries have allowed
access to the frequency band and system installers should be aware of the regulations
for any specific country prior to installation.

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1.7 Lightning Protection
WARNING: The following notes are general recommendations for the system. The
wireless equipment should be installed by a qualified professional installer and must
follow local and national codes for electrical grounding and safety. Failure to meet
safety requirements and/or use of non-standard practices and procedures could result
in personal injury and damage to equipment. A direct lightning strike may cause
serious damage even if these guidelines are followed.
All outdoor wireless equipment is susceptible to lightning damage from a direct hit or
induced current from a near strike. Lightning protection and grounding practices in
local and national electrical codes serve to minimize equipment damage, service
outages, and serious injury. Reasons for lightning damage are summarized as:
- Poorly grounded tower/antenna sites that can conduct high lightning strike energy
into equipment.
- Lack of properly installed lightning protection equipment that can cause
equipment failures from lightning induced currents.
A lighting protection system provides a means by which the energy may enter earth
without passing through and damaging parts of a structure. A lightning protection
system does not prevent lightning from striking; it provides a means for controlling it
and preventing damage by providing a low resistance path for the discharge of energy
to travel safely to ground. Improperly grounded connections are also a source of noise
that can cause sensitive equipment to malfunction.
A good tower grounding system disperses most of the surge energy from a tower
strike away from the building and equipment. The remaining energy on the IF cable
shield and center conductor can be directed safely to ground by using a lightning
arrestor in series with the IF cable.
To limit the equipment damage due to a lightning strike, the following practices are
recommended for the wireless system:
- Provide direct grounding from the antenna mounting bracket, the radio and
antenna and the lightning arrestors to the same ground point at the base of the
tower or a ground bus on the building. Use the grounding screws on the antenna
bracket and the radio and antenna for terminating the ground wires.
- Install one RF lightning protector between the radio and antenna in series with the
RF cable.
- A lightning arrestor in series with the IF cable at the point of entry to the building.
- Install a lightning arrestor in series with the IF cable at the transceiver on the
tower/mast.
- The AC wall outlet ground for the terminal must be connected to the same
grounding system as the radio and antenna lightning protectors.
- The ground connection on the back of the terminal should be connected to the
same ground for the building.

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1.8 Product Information
Use the following table to record important system information:
Product Information
Terminal SN: MAC Address
Transceiver SN: Model #:
Antenna Model No.: Antenna SN:
Serial Number Stickers

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Chapter
2
2
2 G Ge et tt ti in ng g S St ta ar rt te ed d
Congratulations on your purchase of the Redline Access Node-30e wireless
broadband system. Redline Communications is a world leader in design and
production of Broadband Fixed Wireless (BFW) systems.
The AN-30e system consists of an indoor terminal and outdoor radio (transceiver and
antenna).
Figure 1: AN-30e System: Terminal, Transceiver, and Antenna
A point-to-point (PTP) link is comprised of an AN-30e system configured as a sector
controller (master-mode) and a single AN-30e configured as a subscriber station. The
sector controller establishes a bi-directional data link with the subscriber station. The
subscriber receives and sends data under the control of the sector controller.

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2.1 Terms Used in this Manual
The following terms are used in this manual:
Table 1: Terms
Term Description
AN-30e
terminal
Indoor unit
AN-30e
System
AN-30e
Radio
Transceiver + Antenna
Sector Controller
Master-mode
The terminal is configured as a sector controller (base
station). This system controls the wireless link polling and
transmission opportunities. The sector controller is
connected to customer Ethernet network and establishes a
bi-directional data link over-the-air with one or more
subscriber AN-30e systems.
Subscriber Station
Master-mode
The terminal configured as a subscriber station.
The subscriber is connected to the customer Ethernet
network, and both receives and sends data over-the-air
under control of the sector controller.

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Chapter
3
3
3 S Sy ys st te em m O Ov ve er rv vi ie ew w
The AN-30e is a high-performance, high-speed wireless Ethernet bridge terminal
providing a scalable multi-service platform from a common equipment infrastructure
and management system. The AN-30e system is a Class A digital device for use in a
commercial, industrial or business environment.
The AN-30e system operates in the 5.4 GHz to 5.8 GHz band and includes advanced
technologies to address inter-cell interference. The AN-30e can be equipped with a
narrow beam antenna to provide high directivity for long-range operations in clear
line of sight (LOS) conditions. The system also delivers enhanced security through a
proprietary over-the-air encryption scheme.
Figure 2: AN-30e terminal
The AN-30e system is equipped with dynamic frequency selection (DFS) to detect
interference from other devices using the same frequency and automatically take a
pre- selected action, such as disable transmission or relocate transmission to
alternative frequency. The system also includes an automatic transmitter power
control (ATPC) function to automatically adjust the transmit level of subscribers to
match a selected RSSI value.
The AN-30e PTP system operates using one end of the link designated as the sector
controller (master) and the other end of the link as subscriber station. The sector
controller MAC utilizes a request/grant polling mechanism to determine when the
subscriber station requires bandwidth. When the subscriber station requests
bandwidth, the sector controller MAC allocates uplink time slots based on current
availability.

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3.1 TDM over Wireless
The AN-30e terminal supports simultaneous transport of up to eight full or fractional
rate E1/T1 lines. Optional high speed Ethernet access is also available to operate
concurrently with the TDM transport.
3.1.1 Theory of Operation
TDM transport is achieved through a form of circuit emulation specifically optimized
for wireless operation. The TDM signals are received by the AN-30e at the serial port
interfaces, sampled, and encapsulated within an Ethernet frame structure. The
Ethernet encapsulated traffic is transported over the wireless link to another AN-30e
where the TDM traffic is reconstructed by reversing the encapsulation process and re-
clocking the TDM traffic.
Regular CAS signaling is passed transparently in the TDM traffic, and is not
monitored by the AN-30e system. For fractionalized E1, at least one bundle on each
port must include the signaling channel to support this pass-through feature.
3.1.2 TDM Configuration
TDM signals on the RJ-48/BNC interfaces are sampled and the data is encapsulated
into Ethernet frames. This data is transmitted over the wireless link where the TDM
traffic and clock synchronization are reconstructed.
The TDM signals are transmitted in up to eight separate bundles. Each bundle may
include data from up to 32 consecutive timeslots, allowing full or fractional transport.
Each bundle may be assigned a separate AN-30e system destination address.
Fractional nx64 services allow the user to conserve bandwidth by sending only a sub-
set of channels (time-slots) to transport over the wireless link. The TDM channels can
also be mapped to different timeslots/serial ports at subscriber AN-30e terminals,
performing a cross-connect function over the air.
Figure 3: AN-30e Ethernet/TDM Transport

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Jitter
Variable transmission delays are introduced by the simultaneous transmission of
TDM and data traffic. To insure proper timing of reconstructed TDM traffic, the
subscriber terminal employs a jitter buffer. The jitter buffer is an industry standard
method used to compensate for delay variations that occur during transport of the
encapsulated Ethernet traffic.
Latency
To achieve the lowest possible latency, the AN-30e must be used exclusively for
TDM transport and the Ethernet data port must be inactive. Use of the Ethernet port
for in-band management or user data transport requires higher jitter buffer settings
proportional to the level of non-TDM throughput.
QoS
The AN-30e uses IEEE 802.1p to enforce QoS for TDM based applications such as
mobility backhaul and enterprise PBX traffic. Traffic can be assigned to high or low
priority queues. Ethernet packets are examined and queued according to the priority
tag. All TDM traffic is assigned to be high priority.
Flow Control
The IEEE 802.3x standard provides a flow control method for improved traffic
shaping. When the AN-30e terminal detects a high traffic condition, or the wireless
throughput is decreased, an IEEE 802.3x pause control frame is sent to the upstream
Ethernet device. This control command inhibits the Ethernet device from transmitting
additional regular data packets for the period specified in the pause control frame, or
another pause control frame is received with the time set to zero. Only flow control
packets can be transmitted from a paused device.
Deployment
A typical PTP configuration may be used for backhauling full rate E1/T1 lines in a
mobility application. All traffic is terminated at the same endpoints.
The AN-30e can also be deployed in a cascaded multi-hop configuration with drop
and insert points. In the following multi-hop example, the TDM data is encoded and
sent over the wireless link to other AN-30e systems. Data received on the wireless
link may be directed to a local TDM port for decoding and/or routed to the Ethernet
port connected to another Redline system for retransmission on a separate wireless
link.

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Figure 4: AN-30e Multi-Hop Deployment Example