|PXML No. 44
APPROVAL No. S/1208/3/C/020912
The EARL was marketed by by BT North East Region and was not a portfolio product. The contract of June I983 committed the manufacturer to provide hardware support for 10 years from the date of delivery of the last system.
The system was made by Ericsson and was also called the Diavox 824 by GPT.
The Earl is a key telephone system with a maximum capacity of 12 exchange lines and 24 extensions. It has a free standing central control unit with box connection. Only Earl terminals may be used with the system, "Alpha", "Beta" and "Courier Alpha" terminals are available.
The "Alpha" terminal has a capacity for 8 lines, whilst the "Beta" only has provision for 2 lines.
Approved for direct connection to the PSTN (loop disconnect signalling only) or by working as a (List A) subsidiary system (loop disconnect signalling only) connected to a (List C) PBX.
The system will support Earth Loop or Time Break Recall.
The following software levels are approved for use with Earl:-
TITLE NUMBER REVISION DMB 3 ROP 131396/3 9X DMB 4 ROF 137 5167/1-1 1X DMB 5 ROF l37 St67/2 R3X
PARTS DESCRIPTION PART NUMBER Control Unit Cabinet OX BFL 103202/O1002 Control Unit Cabinet OX BFL 1092D2/O1005 Exchange Line Card BTC 1-1 3X ROF 131 354/1 Signal Processing Board SPB 4X ROF 131390/1 CPU Board CPU 7X ROF 131395/1 Data Memory Board DMB 9X ROF 13l 396/3 DC/DC Converter 2 POW 2 1X ROF 131529/l DC/DC Converter 1 POW 1 1X ROF 13l 667/5 Internal Link LJC 2-1 2X ROF 131 796/l Prog Data Unit PDU 3 SX ROF 131817/3 Extension Card ELC 2 2X ROF 131844/1 Switching Network SWN 1X RVR 122 001 Alpha Telephone 3X DBA 192 002/02010 Beta Telephone 3X DBA 191001/O1010 Courier Alpha 12 Telephone 3X DBA 693 002/02010 Courier Alpha 12 Loudspeech Telephone 4X DBA 696 003/02010 NOTE - Lower numeric revisions are acceptable. Alpha element (X) can stand for any alphabetic code.
Last revised: December 18, 2010