atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's T1/E1, CCIS....

Hello,
I am not familiar with telephony networking..
Can any one tell me what are the diferences between the T1/E1 and CCIS? :confused:
Big thanks to all replies.

T1 (T-carrier, Level 1) is simply the digital signal level-1 (DS1) 'facility' that provides transport for 24 digitally multiplexed voice channels (using channel associated signaling/CAS or "inband" signaling), or 23 voice channels and a separate D-channel for signaling and message control (using ISDN PRI protocol). It can also be used to truck data at a rate of 1.544 megabits per second.

E1s transport 32 channels at 64Kbps (2 channels are reserved for signaling and controlling.) E1s and T1s may be interconnected for international use.

CCIS (Common Channel Interoffice Signaling) is simply a separate type of signaling, and is often used for trunking between different telephone exchanges. "Common Channel Signaling System 7", or SS7, is a signaling protocol that serves as an excellent example of CCIS. In using SS7, voice conversations are handled by the traditional telephone switches, while control signals are transmitted over a separate, packet-switched network, providing for much faster connects and disconnects while also allowing data, such as calling number delivery (caller ID) to be included. Messages transported using CCIS can also inform end offices of network congestion and outages. CCIS also serves as an important factor when interfacing VOIP calls with the traditional telephone network (PSTN).

Thanks a lot.
can we just use E1/T1 cards to connect 2 NEC NEAX 2400 MMG PBXs together?
If yes how can I get the programming for that?

Your welcome, Lee. Rather than to move this discussion back over to the NEC forum: Simply use the "search" at the top of this page. If you receive no helpful information thru your search, just post your NEC 2400 NEAX MMG question as a new topic in NEC. This will help you receive faster responses to your question, and assist our future members ability to locate information thru their searches as well. :thumb: