Panel call indicator

A Call Indicator on display at the Museum of Communications

Panel Call Indicator, or PCI, is a form of signalling used between two telephone offices.

PCI, originally designed along with the panel type of telephone office, was intended to allow subscribers in automated exchanges to dial numbers in manual offices the same way they dialled numbers in panel offices. As a format of interoffice signalling, PCI is one of multiple options retained for compatibility in the #5 Crossbar switch, a later system which served as the platform for the initial DTMF push-button telephone services.

单词	Coded Call Indicator
释义	Coded Call Indicator 英语百科 Panel call indicator Panel Call Indicator, or PCI, is a form of signalling used between two telephone offices. PCI, originally designed along with the panel type of telephone office, was intended to allow subscribers in automated exchanges to dial numbers in manual offices the same way they dialled numbers in panel offices. As a format of interoffice signalling, PCI is one of multiple options retained for compatibility in the #5 Crossbar switch, a later system which served as the platform for the initial DTMF push-button telephone services.
随便看	alphagrams的意思 Alpha granule的意思 Alpha granules的意思 AlphaGraphics的意思 alpha Gs的意思 alpha guaiaconic acid的意思 alpha Haemocyanin的意思 alpha hand contamination monitor的意思 alpha hazard的意思 alpha heating的意思 Alpha heavy chain disease的意思 alphahelical的意思 alpha helical conformation的意思 alpha Helical Conformation,Protein的意思 Alpha helices的意思 Alpha helix的意思 alpha helix confirmation的意思 alphahelix confirmation的意思 alphahelix conformation的意思 alpha helix conformation的意思 Alpha helixes的意思 alpha hemelysin的意思 alpha hemolysin的意思 Alpha hemolysis的意思 alpha hemolytic streptococcus的意思

Coded Call Indicator

Panel call indicator