Multicom 2000 Telephone Interface MCTCA

Model MCTCA - Telephone System Interface

The MCTCA Telephone System Interface is designed to add up to eight outside telephone lines, complete with DISA access features, to the Bogen Multicom 2000 System. Up to two MCTCA can be installed per system. The MCTCA has two optional accessories consisting of an MCOC connector card and the MCOCA inter-connecting ribbon cable. The interface card installs easily in one of the designated slots of the card frame. The optional connector card has eight modular plugs and uses a standard modular telephone cord to connect to any telephone system supplying a 90-volt ring signal and loop detect (such as a PBX station port).

The MCTCA provides eight unique stations which function as trunk ports to connect the system to outside lines. Each station detects the 90-volt ring signal of the incoming call and rings a user-selected day or night enhanced staff or administrative telephone. When the telephone handset is lifted, the MCTCA establishes a loop connection between the telephone and the outside line. Following a call, the interface responds to a disconnect pulse and disconnects the call. The first line on the MCTCA can also be programmed to disconnect on a reorder tone, enabling it to operate with certain phone systems. The architectural number assigned to the calling station shows on the administrative telephone’s display panel during an incoming call (a unique ring tone is also heard at the administrative telephone). Incoming calls can be call-forwarded, conferenced, and transferred within the system.

The Direct Inward System Access feature (DISA) lets personnel control system functions from off-premise telephones. The DISA feature may also include password protection.

Outgoing calls can be made at any enhanced staff or administrative telephone provided it has been programmed for access to this feature. Access can be restricted to making local calls, or unrestricted, permitting local and out-of-area calls. Outgoing calls are initiated by dialing a 2-digit access number (menu guided on the administrative telephone) and are assigned by means of a circular hunt, ensuring balanced use of the lines. If a line is available, the calling telephone receives an outside dial tone. If a line is not available (or if access is not allowed), the telephone receives a busy signal.

The interface card contains all relays and isolation transformers needed to interface with the telephone lines. Optical isolators are used to detect the ring voltage. Varistors, diodes, transorbs, and fuses are used to protect the card and the system from harmful transients that may be present on the lines.


  • Adds up to eight outside telephone lines to Multicom 2000 System
  • Interfaces with 90-volt ring loop-start telephone lines
  • Incoming calls ring user-selected day and night administrative telephones
  • Direct Inward System Access capabilities with and without password protection
  • Outgoing calls from any enhanced staff or administrative telephone (programmable access levels)


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