NEC ND-71762(E) system manual System Configuration 3.1 Outline, Modem

GENERAL INFORMATION FOR CCIS

(d)Network Reliability

Alternate Routing provides the CCIS network with maximum reliability. If the signaling link between two nodes should fail, signaling is sent over an alternate route, via another node, without loss of service. Directly- connected redundant links can also be provided to assure the reliability of the network.

(e)Reduction in Personnel

Because management, cost accounting, and services, such as Attendant operation, can be centralized, the num- ber of people necessary to administer the network can be reduced.

(f)Reduced Hardware

Signaling over a common channel; better utilization of trunking facilities; and centralized management and services all result in a vast reduction in hardware when a CCIS network, rather than a conventional Tie line network, is used.

3.SYSTEM CONFIGURATION 3.1 Outline

This Section describes the hardware configuration and its specification, the names of interface equipment and other related subjects. Figure 2-3 shows No. 7 hardware configuration, respectively. The control signal circuit used for CCIS is classified into the digital circuit and analog circuit. The CCH card can be used for both digital and analog control signal circuit and the CCT card is used for digital one. CCH sends control signals to and receives from the distant office. Also, for network synchronization, PLO/OSC or TSW (Phase Lock Oscillator/Oscillator or Time Di- vision Switch) are used.

For the analog control signal circuit, CCH circuit card is used with MODEM.

Table 2-1 shows the CCIS interface specifications and their applications.

Table 2-1 CCIS Interface Specifications

TYPE OF	SIGNALING	INTERFACE	INTERFACE	APPLICATION
FACILITY	RATE	SPECIFICATION	EQUIPMENT
Voice Frequency	4.8 kbps	RS-232C, V. 24, V.	MODEM V27	Used for a CCIS Tie Line (4ODT) Net-
Circuit		28	or equivalent	work.
1.544 Mbps	48-64 kbps	T1-D3	T1 Channel	Used with T1 (24DTI) lines.
2.048 Mbps	64 kbps	E1	E1 Channel	Used with E1 (30 DTI) lines.
AT&T IS DDS	56 kbps	V. 35,	NEC DCP DSU	Used if network has extensive Tie Lines,
		V. 28/V.11	or equivalent	with heavy traffic conditions, and AT&T
				IS Digital Data Service is available.

CHAPTER 2 ND-71762 (E)

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