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CHAPTER 2 ND-71762 (E)
Page 4
Issue 2
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
FACILITY
SIGNALING
RATE
INTERFACE
SPECIFICATION
INTERFACE
EQUIPMENT
APPLICATION
Voice Frequency
Circuit
4.8 kbps RS-232C, V. 24, V.
28
MODEM V27
or equivalent
Used for a CCIS Tie Line (4ODT) Net-
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,
V. 28/V.11
NEC DCP DSU
or equivalent
Used if network has extensive Tie Lines,
with heavy traffic conditions, and AT&T
IS Digital Data Service is available.