Telrad Digital DIGITAL FAMILY OF SYSTEMS Feature Description Addendum Manual

Section 2: SYSTEM FEATURES 

76-110-0690/G, Issue 1
2-10THIS PAGE INTENTIONALLY LEFT BLANK 

3-1
Section 3
PRIVATE NETWORKING BETWEEN 
TELEPHONE SYSTEMS
3.1 GENERAL
The DIGITAL systems’ Release 7 networking capability 
enhancement presented in this section:
• utilizes -- in addition to the existing NAP protocol -- the 
Digital Private Network Signaling System (DPNSS) and 
QSIG standard digital protocols.
• provides an expanded set of improved network-wide 
features and services;
• facilitates installation and operation of inter-system private 
networks of all sizes, comprised of both Telrad...

76-110-0690/G, Issue 1
3-2
Network-wide availability of system communication 
features under NAP
As detailed in the Release 6 DIGITAL family of systems 
Operating Instructions manual, the following communication 
features can be accessed and activated between DIGITAL 
network member systems -- under NAP -- as within an 
individual DIGITAL system:
3.3  DIGITAL PRIVATE NETWORK SIGNALING SYSTEM (DPNSS)
3.3.1  What is DPNSS?
DPNSS is a British Telecommunications (BT) protocol, which is 
mandatory in the UK,...

Section 3: PRIVATE NETWORKING BETWEEN TELEPHONE SYSTEMS
3-3
3.5  PRIVATE NETWORK MEDIA AND CONNECTIVITY
A DIGITAL system will be connected to the private network in 
either of the following ways:
• digital lines running the DPNSS or QSIG protocol:
•2M    -- in ETSI domain, or
•1.5M -- in US interfaces,
• analog lines -- in the case of very small systems, where:
•a DIGITAL-system-only network is built, and 
•only features available on NAP protocol are used.
3.5.1 USA
In the USA:
• the interface for DPNSS...

76-110-0690/G, Issue 1
3-4
3.6 NETWORK CARDS 
Special system cabinet cards for DIGITAL systems in private 
networks have been introduced for DPNSS and QSIG. Cards 
for both protocols are prefixed by the letter N, followed by the 
number of connected channels, as follows:
• USA: N12 and N24;
• ETSI: N10, N20, and N30.
These network cards are based on the DIGITAL system PRI 
card platform:
• USA: PRI12 and 
PRI24;
•ETSI: 
PRI30 (in the UK: also PRI10 and PRI20).
A DPNSS or QSIG networking card can be...

Section 3: PRIVATE NETWORKING BETWEEN TELEPHONE SYSTEMS
3-5 3.7.3 Feature list
Table 3-1 shows the list of private network features supported 
by Release 7 DIGITAL systems, according to the protocols with 
which they comply.
* 
In the UK, the DPNSS supported features are the same features as 
supported on NAP, except for the addition of Call Back on No-
answer, Name Display, and Infinite Loop Avoidance and the 
elimination of Page, which is considered unnecessary in the UK.
3.7.4  Interprotocol feature...

76-110-0690/G, Issue 1
3-6
CBWF
Call Back when Free (CBWF) is also known as:
• Call Back on Busy (CCB)  -- DPNSS;
• Completion of Calls to Busy Subscribers (CCBS)  -- QSIG.
CBNU
Call Back when Next Used (CBNU) is also known as:
• Call Back on No Answer (CCNA)  -- DPNSS;
• Completion of Calls on No Reply (CCNR)  -- QSIG.
CF
Call Forward (CF) is also known as:
• Call Diversion (CD)  -- DPNSS;
• Call Forwarding Unconditional (CFU)  -- QSIG. 

Section 3: PRIVATE NETWORKING BETWEEN TELEPHONE SYSTEMS
3-7 THIS PAGE INTENTIONALLY LEFT BLANK 

76-110-0690/G, Issue 1
3-8