This is the RVR 122 002 Reed switch from an Ericsson AXE10 BYB101 system. the card was manufactured in 1980 and comes from the Spanish market. It is incredible the know that this system is still in service today!
The card we are looking at here (labeled RP64) is an RP4-H card. RP4 stands for Regional Processor Generation 4 being a newer version of the traditional AXE10 BYB202 Regional Processor.
The primary benefit for RP4 is that it is co-located in a subrack with the Extension Modules (EM's) that it controls. In AXE10 RP's control EM's and EM's control devices.
The RP4 is only found in BYB501 / AXE810 generation of AXE10 and does away with parallel buses, instead having a serial bus cable as seen above RPB S/O and RPB S/I. (Serial out and Serial in)
These buses are actually cables that are cabled directly back to the Central Processor (APZ212*33 in the above case)
The above picture shows the hardware architecture of the generic device magazine, also known as a subrack. As I said above, in AXE10, RP's control EM's and EM's control devices which can be clearly seen in the picture.
CP controls RP4 which controls the EM's which contain (and control) devices. A device can be any entity that provides a service such as a line circuit (LIC) on a line board (LIB) for instance. An example of a LIB in AXE10 is ROF 137 4442/1 LIC12.
This is an Ericsson BYB501 IOG20BP from the Arnhem hybrid site.The IOG20 BP was a two shelf configuration meaning that the A-side node was on one shelf (top) and the B-side node below it.
The IOG20 came in several variants; IOG20A, IOG20B, IOG20C, IOG20BP. There was also IOG20M.
A- the first variant (model) of IOG20 on early BYB501 (extremely rare).
B- the improved variant of IOG20A. All serial buses.
BP- is for parallel as this IOG version could terminate RP buses from BYB202 parallel buses as well as BYB501 serial buses.
C is the compact variant which has both A&B-side in the same shelf with all serial buses.
To be fair- all IOG20 could be adapted to handle parallel buses.
They were superseded by the APG40 running on a Windows platform.
Fully under floor air conditioned AXE10 BYB501GSM Main Switching Centre (MSC) CORE with BYB202 APZ212*20 processor that I commissioned in the Middle East during 1999.
The customer commenced full commercial operations in the same year and by 2001 had over 1,000,000 mobile subscribers.
The above picture was taken when I was called in one weekend to fix
an ETC5 card that had gone faulty.
This is a typical Ericsson control room from the late nineties. Earlier control rooms are easily distiguishabe as they used Tandberg (dumb) terminals for switch commuications however here we have pc terminals using windows 98. Each switch that was installed would have had a room like this and usually with the glass screen so that one could see the switch. We also enjoyed using laptops which made our life much easier having all of our software tools at our fingertips wherever we went.
This card houses the Hard disk (top) and Optical disk (bottom) drives in an AXE10. The card itself is housed in the IOG20. The HDD is the 4.40GB FUJITSU SCSI and the OD-1 is the FUJITSU 640MB 3.5" SCSI magneto-optical drive.
IOG is an acronym for Input Output Group and it is using these drives that we would perform such tasks as loading the exchange data from OD (a.k.a MO) into the CPUs memory banks or transferring a backup of the exchange data out to portable media.
In recent years these drives have become further redundant as backup files and correction packages are increasingly transferred using the File Transfer Protocol (FTP).
HDD: FUJITSU CA01407-B512.
ODD: FUJITSU M2513A6Z#N.
Board: ROJ 207 077/1 R1A OD-HD.
Manufactured: 1998 Week 36.