TETRA Equipment and Terminals for PMR Networks

Public Safety, Utility and Transport organisations over many years have deployed Private Mobile Radio (PMR) infrastructure equipment with high availability and reliability to provide to provide dedicated, secure communications networks.

Modern implementations of PMR utilise the digital TETRA standard, which provides interoperability between systems and terminals from a range of manufacturers.

@YellowsBestLtd our mission is  “Keeping Customers Operational, by continuing to provided spares solutions, hardware repairs and support services to ensure continued long-term operations and maintenance.  

Examples of the products we have recently been requested to provide spares solutions and repairs services include Motorola Desk Radio Terminals: 

Terminal Products
Part NumberProduct CodeDescription
M47PCC6T25_NMT912MTM700 380-430 MHz DESK Terminal
M80PCC6TZ5_NMT912MMTM800 380-430 MHz DESK Terminal
FIRMWARECLEAR / TEA1 / TEA2Choice for all radios
OPTIONEXP DASHExpand Control Head, 5m cable

If you have similar or other Radio solutions requirements and legacy maintenance services needs, please get in touch to discuss how we may be of assistance.

New parts for Legacy systems

Keeping Customers Operational

A continuing challenge for public and private network owners is the ongoing maintenance of infrastructure systems to support their business needs. In many cases, it makes sense to continue to operate legacy systems which are still fulfilling unchanged requirements, rather than contemplate costly and time-consuming change-outs and replacements.

@YellowsBestLtd seeks out new products and legacy equipment spares to assist with these aims. Recent enquiries have been fulfilled supplying refurbished and surplus stocks of equipment cards, as well as built-to-order cables and connectors to suit exact requirements.

There follows a few examples of items we have recently supplied. We would welcome any enquiries for the supply of similar or alternative parts, or support services to provide hardware repairs. Please get in touch; we look forward to hearing from you!

Example items, recently supplied

Connectors
Part NumberProduct CodeDescription
D-21470EuroEuro Connector 3×7
Connector 3×7 – D-21470
Connector 3×7 – D-21470
Cables
Part NumberProduct CodeDescription
102-722-1Coax-SMB 1mBT3002 Coax Cable BNC Plug to SMB Right Angle, 1m
102-722-3Coax-SMB 3mBT3002 Coax Cable BNC Plug to SMB Right Angle, 3m
102-722-5Coax-SMB 5mBT3002 Coax Cable BNC Plug to SMB Right Angle, 5m

Coax-SMB-5m

Equipment
Part NumberProduct CodeDescription
T37882.02NDUeNDM DC Unit
TA 21513DF 2-8Term. Repeater 2-8 M, 1300nm LED MM/SM
TU 21236.10VF E&MCU 8ch E&M/uP: 1xUKe&m/VF
TU 21216SUB/EXCHChannel Unit SUB/EXCH
SUB/EXCH – TU 21216

More equipment spares are listed here

Motherboard Repairs

Repairs to elements such as modules and cards of infrastructure hardware is one way we achieve our mission of “Keeping Customers Operational”. A good and recent example is Motherboards for display systems. These are from established, long-standing and therefore proven and fit-for-purpose systems. It therefore makes sense to maintain and extend the life of these parts.

Typical with such ‘legacy’ elements is that the level of complexity of the items is not excessive, meaning that repairs using discreet components is perfectly feasible, unlike more modern integrated systems which use specialised parts that cannot be freely or cheaply obtained or impossible to disassemble resulting in them being classed as ‘BER’ (Beyond Economic Repair). This is ultimately costly and disruptive, requiring wholesale replacements.

@Yellowsbestltd would be keen to hear from you should you have any repairs requirements. We would welcome receiving any defective items you have in order to perform a no-cost assessment to establish the feasibility and likely cost of restoration. Please get in touch to let us know how we can help.

Searching for NMS cables

Call out for any requirements for Network Management Systems cables

In addition to satisfying world-wide customer product sourcing requirements for current and ‘legacy’ equipment technologies, @YellowsBestLtd also seeks out peripheral items such as Network Management System (NMS) cables.

These items may be minor in nature and originally low-cost, but they are vital for continued use and configuration of transmission nodes via management systems which evolved way before modern wireless technologies and smart phone ‘app’ based tools. Such specialist cables are becoming increasingly hard to find, since once used and damaged, they are likely to be disposed of rather than refurbished, and no new replacements are being produced.

However, in the absence of surplus stocks, it is possible for us to arrange for the manufacture of specialist cabling products including those for NMS. Due to the particular nature of the connectors utilised, these have to be specially sourced, but the cable materials themselves can be specified and applied accordingly. However, it is the orginal design information that is most critical to obtain the right functionality and compatibility.

Whatever your requirements, if you are seeking equipment or cabling for new or legacy systems, then please let us know as we can usually assist. We look forward to hearing from you.

Searching for Keymile DUP14

Call out for any stocks of Keymile’s Dual Power Input Modules (DUPI4)

@YellowsBestLtd we satisfy world-wide customer product sourcing requirements for current and ‘legacy’ equipment technologies from a wide range of Original Equipment Manufacturers (O.E.M.s).

In particular, we have stocks of surplus and refurbished products from the Keymile UMUX range which we are able to supply to assist customers in maintaining their operational networks.

However, one item not in our stocks that is of immediate interest to several of our clients is the Dual Power Input Modules (DUPI4).

We are urgently seeking supply; if you can assist, please get in touch!

These items provide the ultimate power protection upgrade:

  • Unit centralises alarm functionality and power input control
  • Delivers built-in redundancy
  • Power protection for both sub rack and fan unit
  • Increased the VDC availability

The DUPI4 acts as a dual input power decoupler that selects between two independent VDC power feeds and delivers them directly to the sub rack’s power input. Thus, the DUPI4 ensures uninterrupted service delivery since the power feed change over is instantaneous.

‘Legacy’ telecoms history

The UMUX SDH product portfolio was originally launched 1991 by Ascom, which subsequently became Keymile. Keymile was sold to ABB in 2017 when the UMUX range was discontinued, and then was acquired in 2019 by DZS. 

Comprehensive Functionality

The UMUX platform provides carrier-grade reliable multi-service multiplexing and aggregation functions over copper and fibre networks. A variety of voice (POTS, FSX, FSO, ISDN) and data (e.g. G.703, V.11, V,24, V,35) interfaces, SHDSL and Ethernet (including PoE+ and EoS) services are available. 

The modular and flexible housing provided by the UMUX 1500 (8U, 21-slot) and UMUX 1200 (4U, 8-slot) 19” subracks provide the perfect solution for all applications and locations, offering redundant controller and power supplies.

Spares for continuing to provide operational service

The UMUX, together with the UNEM network management system and ‘sister’ LINERUNNER and MILEGATE products, continues to provide operational service with various global Operator, Utilities and Transport companies. 

@YellowsBestLtd supports requirements to maintain these networks by supplying various spare part items from refurbished and surplus stocks in perfect working order.  

The definitive ‘Dynanet’ spares list

Nokia ‘Dynanet’ PDH Transmission products

For many years, the ‘Dynanet’ family of PDH Transmission telecoms products have well served Public Operator and Private Network Customers across the Telecoms, Utilities, Transport and Public Safety markets with high availability mission critical infrastructure, and indeed some networks are continuing to provide good operational service.

They were first introduced by Nokia over 20 years ago, and were continued in recent years by DNWP. Production of the majority of the product range was ceased in 2019. 

Spare parts for continued operational service

@YellowsBestLtd satisfies world-wide customer product sourcing requirements for current and ‘legacy’ equipment technologies from a wide range of Original Equipment Manufacturers (O.E.M.s).

In particular, we are able to supply products from the ‘Dynanet’ range, given that we have a significant amount of refurbished and surplus equipment items in stock for immediate delivery. Hence there continues to be spares support for current and even increased deployed networks.

Comprehensive Stocklist of ‘Dynanet’ Spares

Whereas the ‘Dynanet’ family contained a wide range of products produced and supplied over many years, some of which are relatively obscure and unlikely to be needed, there are a number of core items that have proved to be always in demand by Customers. Consequently, we have endeavoured to create a comprehensive stock list, containing part numbers, product codes and descriptions and images which is presented here, and would welcome any enquiries you have for spares requirements that we can fulfil. If however, you are seeking something more unusual, then please let us know as we can usually assist. We look forward to hearing from you.

Mechanics
Part NumberProduct CodeDescription
T37870.01NDMNDM 19in 17-slot Subrack
Subrack
19in Subrack – T37870.01
Part NumberProduct CodeDescription
T37871.01NDMNDM DN2 19in 17-Slot Subrack
Power
Part NumberProduct CodeDescription
T37882.01NDUNDM DC Unit
NDU – T37882.01
Part NumberProduct CodeDescription
T37882.02NDUeNDM DC Unit
NDUe
NDUe – T37882.02
Part NumberProduct CodeDescription
T37889.01NBUNDM Backup Unit
NBU – T37889.01
Multiplexers
Part NumberProduct CodeDescription
TC 21101DM2DM2 Multiplexing Unit, 75ohm
DM2
DM2 – TC 21101
Part NumberProduct CodeDescription
CC 24002DB2Branching Unit, B2, 2x2Mb/s, 75ohm
B2
DB2 B2 – CC 24002
Part NumberProduct CodeDescription
CC 24011DB2Switching Unit, X2, 2Mb/s, 75ohm
X2
DB2 X2
Part NumberProduct CodeDescription
CU 24111DN2Control Unit, DN2, 75ohm
CC 24101DN2Interface Unit, IU2, 2x2Mb/s, 75ohm
IU2
DN2 IU2 – CC 24101
Optical Line Units
Part NumberProduct CodeDescription
TA 21513DF2-8Terminal Repeater 2-8M, 1300nm, LED MM/SM
TA 21516DF2-8Terminal Repeater 2-8M, 1300nm, LASER SM
TA 21518DF2-8Terminal Repeater 2-8M, 1300nm, LASER LP
DF2-8 – TA21518
Copper Line Units
Part NumberProduct CodeDescription
T65580ACL2iACL2i PF Gen
ACL2i PF GEN – T65580
VF and Sub
Part NumberProduct CodeDescription
CU 21206SUB/SUBChannel Unit SUB/SUB
SUB/SUB – TU 21206
Part NumberProduct CodeDescription
CU 21206.50SUB/SUBChannel Unit RSM (L/E Start) 6ch
SUB/SUB – TU 21206.50
Part NumberProduct CodeDescription
CU 21216SUB/EXCHChannel Unit SUB/EXCH
SUB/EXCH – TU 21216
Part NumberProduct CodeDescription
TU 21236.10VF E&MChannel Unit 8ch E&M/uP: 1xUKe&m/vf
VF E&M
VF E&M – TU 21236.10
Data Interface Units
Part NumberProduct CodeDescription
TU 21125DIU X.21Data IF Unit 48..64k with sync, X.21
DIU X.21 – TU 21125
Part NumberProduct CodeDescription
TU 24013DIU nx64kData IF Unit 2M, nx64k: G.703/704, 75ohm
nx64k
DIU nx64k – CU 24013
Ethernet & ISDN
Part NumberProduct CodeDescription
TU 21133.03ETHERNETEthernet IF 10/100 2ch, 3+3 if, switch
Supervisory
Part NumberProduct CodeDescription
TC 21705SUPY SUBSupervisory Substation
Special Units
Part NumberProduct CodeDescription
T37885.01RING GENRing Generator
T37885.02RING GENRing Generator + DC/DC converter
RING GEN – T37885.02
Optical Teleprotection
Part NumberProduct CodeDescription
D-24204TPSO C37.94Optical Teleprotection Interface, C37.94
C37.94
TPSO C37.94 – D-24204
Q1 Management
Part NumberProduct CodeDescription
T31094.01DCNADCN Adapter C4.0
DCNA
DCNA – T31094.01
Connectors
Part NumberProduct CodeDescription
D-21470EuroEuro Connector 3×7
3x7
Connector 3×7 – D-21470

Marconi XMP1 telecommunications

Traditional PDH / SDH transmission

The XMP1 product is multi-service access / transmission node equipment capable of PDH data rates of 8Kbps to 34Mbps and SDH STM-1 or STM-4. Originally manufactured by Marconi, the range was taken over in later years by Keymile and Bosch before being discontinued.

The system is still in service, customers include Utilities and Transport organisations, and typically deployed as a terminal multiplexer or as an ADM (Add-Drop-Mux). It can provide point to point or leased line in a corporate network for POTS, data, LAN, IDSN etc.

The building blocks of the system are the central unit which provides control and management, the SDH cards for STM-1 and STM-4 aggregation and the line units which provide uplink in the form of E1, E3 or SHDSL which can be copper or optical. 8 and 16 Slot versions were available as well as an SL (slimline) variant.

Spares and Repairs for continued long-term operation and maintenance

Whereas these products are no longer manufactured, @YellowsBestLtd is able to supply a limited amount of spare parts and/or offer repair services in order to aid customers in keeping their networks operational. There follows a non-exhaustive list of typical parts that can be supplied, we would be very pleased to receive specific requests for items that are needed.  

A205HAT00080AAB05HAT00080AABXMP (MK2) POWER SUPPLY 48/60V
AN0005905762.7026.353.00-A001PORT HDB3 (2)                          
AN0009822462.7040.405.00-A001MODUL V.11                        
AN0011478462.7040.303.00-A001ETHERNET ADAPTER                  
AN0011810662.7006.430.00-A002POWER SUPPLY 48-60V                 
A2AN00034165 Cable Clamp
A2AN00086011 CABLE CLAMP PANEL 1 HU     
A2AN00086013 PATCH PANEL V.11
A2AN00102460 CCU-CENTRAL UNIT CC WITH QD2
A2AN00102463 SUBRACK XMP1 (16) 
A2AN00109256 FRONTPANEL BLUE
A2AN00116240 Connecting Cable 2m
A2AN00214510 Connecting Cable Central Unit Protection 
A2AN00214511 Ethernet Cable (5m)
A2AN0022815 DSK MODULAR
A2AN00274356 Input/Output Alarm Cable(2 O/P,3 I/P)
A2AN00276278 Connecting Cable 6m (Port HDB3) coax 
A2AN00276281 Connecting Cable 20m (Port HDB2) coax
A2AN0034165 Cable Clamp
A2AN00702802 Mounting element
A205HAN00499AAC XMP1-SL CROSS CONNECT
XMP1 spares

@YellowsBestLtd our mission is in “Keeping Customers Operational”. We’re always keen to enhance our range of #business services, increase the #enterprise infrastructure we support and expand our mix of #sustainable solutions we offer for supply and maintenance of new and legacy #technologies and products for our customers. 

Please help us understand your management services or solutions requirements, whether you’re implementing new systems or maintaining existing infrastructure networks to serve your operational business needs. 

#business services new legacy solutions sourcing #enterprise infrastructure #sustainable spares #technologies products @YellowsBestLtd

Sagem ADR SDH family

‘Legacy’ telecoms history

The Sagem ADR product range was an SDH Add-drop Multiplexer (ADM) product family designed as a flexible platform for Metro Access and Metro Core, backhauling, microwave radio and Utilities infrastructure networks. 

ADR155c

The family included ADR155c and ADR622, STM-1/STM-4 ADM, and ADR2500 ‘eXtra’ and ADR10000, STM-16/STM-64 multi-service NG SDH. This range was managed by the IONOS Network Management System (NMS) which also managed Sagem Primary Multiplexers, PDH and SDH microwave radio and DWDM systems.

ADR622

 The ADR family was deployed worldwide with more than 60,000 units over 5 years.

Comprehensive Functionality

ADR2500 ‘eXtra’

The ADR platform offers a large variety of interfaces from E1 and E3, Fast Ethernet and Gigabit Ethernet, enabling the provision of a wide range of end Customer services. Transmission protection for guaranteed QoS is provided with SNCP, MSP, MS-SPRing as well as common unit and tributary protection.

The STM-16 network units can be used for multi STM-1 or STM-4 and local-cross connect functionality thanks to a fully non-blocking switch matrix.  

The modular and flexible housing provided by the ADR155c (2U), ADR622 (6U) and ADR2500 ‘eXtra’ (14U) 19” and ETSI subracks provide a flexible mix of office, street cabinet and equipment room deployment.

ADR10000

Continuing to provide operational service

The ADR family of SDH products continues to provide operational service with various global Operator, Utilities and Transport companies. 

@YellowsBestLtd supports requirements to maintain these networks by supplying various spare part items from refurbished and surplus stocks in perfect working order. 

There follows a list of the main elements that are typically provided, though other items can be provided. Please let us know of any specific requirements you may have. We look forward to being of assistance.

SAGEM ADR Spares List

Part CodeUnit typeDescription
AM101333 / 251 119 665ADR155cA155 BLK STM1/4 21E1 19″/ETSI CORE CHASSIS
AM101330 / 251 137 402ADR 21E120ADR BLK BNC 21E1/120 ITFE CARD
AM101328 / 251 137 366ADR IC1.1A155 BLK FC/PC IC1.1 OPTIC STM1 CARD
251 137 410ADR LAN1A155 BLK ADRLAN 10/100BT ETH ITFE CARD
AM101360 / 251 131 182ADR FANFAN MODULE
AM101670 / 251 137 431ADR EREA155 BLK BNC ELEC STM1 ITFE CARD

The ‘Banana Phone’ reloaded …

Communicating, or stuck in The Matrix?

The original Nokia 8110 ‘slide’ mobile phone was immortalised in the film ‘The Matrix’ in 1999.

Back then, people used mobiles for mostly … calling people, and the occasional text message. Ok, and a few plays of the game ‘snake’!

It was affectionately referred to as the ‘banana phone’ due to its unusual curved shape, though the only colour you could get it in was black.

Since then, we have had a revolution in data networking and an explosion of app-based touch-screen smartphone slates. So much so that people are finding themselves addicted to looking at these personal pocket computers ‘all the time’.

Consequently, there is now a growing trend of wanting a ‘digital detox’ and to get back to basics with a simple, cheap device that keeps you in touch without taking over your life. 

The updated Nokia 8110 4G ‘Banana’ phone

In 2016, HMD Global Oy took over the licence to produce Nokia branded phones, and have since been revisiting and refreshing classic designs including  their take on the ‘slide-phone’ with the 8110 4G.

Nokia 8110 4G – Ready for ‘unboxing’

As well as traditional black it’s available in bright YELLOW, making it this time the true ‘banana phone’.

Nokia 8110 4G – The True ‘Banana Phone’

With a design that harks back to those simpler days, it never-the-less comes with a number of advanced features. 

What’s Good: Simple ‘Real’ number and calling keys for phoning and familiar ‘Nokia’ menu structure providing Call log, Contacts, SMS. Twin SIM cards for 4G calling flexibility at home and away. WiFi. Removable micro SD-card for expandable storage. Replaceable battery. Music Player, FM Radio and headphone jack. Camera, gallery and video player. Internet Browser and e-mail. Flashlight, Notes, Recorder, Calculator and Unit Converter. Clock and Calendar. Google Maps and directions.

What’s not-so-great: No touch-screen! Small display. Minimal App support. Fiddly ‘old school’ text-entry. Slow and limited internet capabilities. Low-resolution imaging and video, and no front-facing 2nd camera. Cursor keys surprising small and tight to bottom of display making scrolling more awkward than it ought to be. Having to take the battery out to insert / remove the memory card.

What’s Fun:  Answering calls with a slide (and end them again by closing. Freedom from ‘smartphone’ addiction, though if you really must, WhatsApp, Twitter, Facebook and Youtube can just about be used. And ‘snake’ (though a strange ‘modern’ version), plus some other games and more can be downloaded. 

Nokia 8110 4G: Apps and Maps

In summary, this is a feature-packed but ‘basic’ mobile which brings an iconic design up-to-date, is fun to have, does the basics and a bit more.

Keeping connected with a digital detox

This Nokia ‘featurephone’ doesn’t pretend to rival ‘smartphones’ in capabilities. But useful as a supplementary device in case of a flat battery, and good for just keeping connected while getting on with life. Handy too when wanting to avoid carrying a very expensive piece of hardware when active or travelling. 

There has been a trend to have just one device with as many functions as possible packaged in, with inevitable strain on battery life. It can however be sometimes preferable to use a Hi-Res player for music, a quality camera for photography, a tablet for internet browsing and a phone for – phoning!

So not a complete digital ‘detox’, rather just providing another alternative option to keep ‘plugged in’ to today’s ‘Matrix’ world of communications.

Your technology experiences

If you have fond memories of past technologies, views on future trends or experiences to share on managing your digital life, please get in touch. We’re keen to discuss how we may be of assistance in developing your business and keeping your new and legacy systems operational.

Nokia 8110 4G: YellowsBest would be delighted to hear from you!

New and Legacy communication issues

Challenges with maintaining Legacy systems

It can make perfect sense to continue to run existing reliable and proven systems, especially if operational requirements have not changed. Alas, the developing nature of technology means that from time-to-time, issues arise. 

Changes to email encyption protocols 

Modern computer communication services support the Transport Layer Security (TLS) encryption protocol. This aims to protect the information sent and received over a standard Simple Mail Transfer Protocol (SMTP) connection between two computers while ensuring that they both agree and understand the method of data transfer.   

However, the earlier versions of TLS 1.0 and 1.1 have been deemed by the industry to be not secure enough and have been superseded by versions 1.2 and 1.3. You and/or your service provider may have already transitioned to the latest protocols. However, if you have old hardware running legacy software, as support from service providers is withdrawn, you may find your email stops working.

How you can tell if it’s an issue

If you’re using an Apple Mac then the Safari Browser has supported TLS 1.2 for web traffic protection since version 7 in 2013. However, if you’re still running ‘El Capitan’ OSX 10.11 with Apple Mail 9.3, it won’t support TLS 1.2 for email. Other computer hardware and software combinations may also run into problems.

Most browsers including Safari ended support for TLS 1.0 and 1.1 in March 2020, and various service providers have either already dropped or soon will withdraw operation of the older TLS protocols.

For instance, one.com will stop support of TLS 1.0 and 1.1 on 17th August 2021. Other service providers may have different end of life dates. If you’re using the one.com service then there’s an easy way to check:

send an email to:

protocol@tls-check.one.com.

This will provide an automated reply telling you what protocol you’re using (works with iPhones and iPads too), like this:

{
            “started”: true,
            “protocol”: “TLSv1.2”,
            “cipher”: “ECDHE-RSA-AES256-GCM-SHA384”,
            “keysize”: 256
}

Other service providers may have similar methods of verifying the protocols, so it’s worth checking with them. Failing that, you may be able to examine the headers of your emails, to look for something like this:

version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128

Solutions if you’re affected

To ensuring your email continues to function, the options include: 

  1. Updating your operating system. In the case of Apple Mail on Mac computers, this means moving to ‘Sierra’ OSX 10.12 as Mail cannot be separately upgraded.
  2. Using a different email client with TLS 1.2 support, e.g. Mozilla Thunderbird.
  3. Using a browser based solution for your email
  4. Changing your settings to send and receive email without encryption (not recommended) 

Balancing New Requirements and Legacy Support

If you want to stick with your current hardware and software choices, this does present a problem, particularly if you’re otherwise happy with your setup and are unable to upgrade.

Alas if you want full compatibility (and security) with the latest industry supported functionality, whilst retaining operation of other  legacy applications, consideration has to be made to invest in new hardware to run in parallel with older systems, which continue to be maintained to perform dedicated compatibility functions.

YellowsBest: Keeping Customers Operational

If you have similar or other new requirements and legacy maintenance needs, please get in touch to discuss how we may be of assistance to keep you operational.