atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems 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).

Thread being moved to T1 Forum .