BS 6450-4:1993

Committees responsible
Foreword
Introduction
Specification
1 Scope
2 References
3 Definitions, abbreviations, notation and concept
4 Classification
5 Compliance principles
6 General testing principles
7 Requirements applying to particular port types
8 General requirements
9 Signalling
10 Transmission
11 Text deleted
12 Crosstalk
13 Port connection arrangements
14 Information required for test purposes and for the
    instructions for use
Annexes
A (normative) Analogue test methods
B (normative) Digital test methods
C (informative) General electrical recommendations
D (informative) Recommendations for overload performance
E (informative) Recommendations for standby power if required
F (informative) Recommendations for the partitioning of
    PBX control functions
G (informative) Recommendations for integrity of design
Tables
1 Summary of ports
2 Relationship between private networking port types
3 Ports for direct connection to a PSTN
4 Ports for direct connection of approved apparatus
5 Private networking ports
6 Ports for connection to private network links
7 Integral terminating station
8 Requirements applying to port type PA1
9 Requirements applying to port type PA2
10 Requirements applying to port type PD1
11 Requirements applying to port type PD2
11a Requirements applying to port type PD3
12 Requirements and recommendations applying to port type 1AS
13 Requirements and recommendations applying to port type 1BS
13a Requirements and recommendations applying to port type 1CS
13b Requirements and recommendations applying to port type 1DS
13c Requirements and recommendations applying to port type 1ES
14 Requirements applying to port type 1AN
15 Requirements and recommendations applying to port type 4A
16 Requirements and recommendations applying to port type 4B
17 Requirements applying to port type 4C
18 Requirements applying to port type 4E
19 Requirements applying to port type 4F
20 Requirements applying to port type NWH
21 Requirements and recommendations applying to port type NW2
22 Requirements and recommendations applying to port type NW4
23 Requirements and recommendations applying to port type NWD
23a Requirements and recommendations applying to port type NWD2
24 Requirements and recommendations applying to port type NWS
25 Requirements applying to port type L2
26 Requirements applying to port type L4
27 Requirements and recommendations applying to port type LD
28 Requirements applying to integral terminating stations -
    analogue, ITS-A
29 Requirements applying to integral terminating stations -
    digital, ITS-D
30 Requirements applying to integral terminating stations
    - cordless analogue, ITS-CA
30a Requirements and recommendations applying to port type ITS-CD
31 Tabulation of call path performance
32 Jitter limits
33 Minimum return loss for 2048 kbit/s service
34 Maximum allowed PBX call path loss for a PBX-derived port
    feeding current
34a PBX call path losses
35 Maximum allowed PBX call path loss for a through-fed PBX
36 Variation of loss with frequency
37 Sending sensitivity mask
38 Receiving sensitivity mask
39 Passband frequency response mask
40 Example showing change of frequency measurements and
    requirements for a usage P and a usage l port
41 Relative sending gain variation mask
42 Relative receiving gain variation mask
43 Total distortion limits
44 Planning values for quantization distortion
45 Limits of sending total distortion
46 Limits of receiving total distortion
47 Recommended delay limits
48 Information required for test purposes and for the
    instructions for use
B.1 Measurement frequencies
Figures
1 Basic circuit diagram of a transmission decoupling unit
2 Transmission decoupling unit (no d.c. feed)
3 Simple PTRP example
4 PTRP example with extra port
5 Multiple PTRP example
6 PTRP equivalence
7 PTRP access
8 Direction of call establishment
9 Dummy ringer REN test circuit
10 Loop back signalling test
11 Asymmetric signalling test
12 Mask of pulse at a 2048 kbit/s port
13 Complex impedance termination
14 Receive-to-transmit loss measurement
15 PBX ITS to port type PD1 or PD2
16 Input relative levels
17 Impedance and signal balance test circuit
18 Test arrangement for determining voltage/current
    characteristics of port
19 Current and voltage limits
20 Figure deleted
21 Conceptual configuration of an I.430 basic access PBX
22 Reference CPP
23 Location of interfaces
A.1 Pulse source
A.2 Outpulsing logic diagram
A.3 PSTN detector circuit
A.4 Circuit for MF tone address signalling
A.5 Signalling test circuit
A.6 PSTN ringing supply
A.7 Equivalent ringer test
A.8 Cessation of calling signal when the port is entering the
    on-line stage
A.9 2-wire port transmission test configuration
A.10 4-wire port transmission test configuration
A.11 SLR and RLR tests
A.12 Port-to-port transmission test configuration
A.13 Figure deleted
A.14 Cross connections for port type 1AS
B.1 Diagram for B.1, B.2 and B.3
B.2 Diagram for B.4, B.7.2, B.8.1 and B.9
B.3 Diagram for B.5.1
B.4 Jitter values for B.5.1 and B.5.2
B.5 Diagram for B.5.2
B.6 Diagram for B.5.3
B.7 Diagram for B.6.1
B.8 Diagram for B.6.2.1
B.9 Diagram for B.6.2.2
B.10 Diagram for B.7.1
B.11 Diagram for B.11 and B.17.3
B.12 Diagram for B.12.3.1,B.13.1, B.13.2, B.15, B.16, B.17.1,
     B.17.2, B.18 and B.20
B.13 Diagram for B.14
B.14 Diagram for B.19
B.15 Diagram for B.21
B.16 Configuration for delay tests
G.1 Example of integrity of design test
List of references

Specifies requirements for private branch exchanges (PBXs) having ports that may be connected to one or more of the following: private leased circuits run by a public telecommunications operator (PTO); two or more public exchange lines; private links. Does not cover all of the features or facilities with which a PBX could be equipped. Coverage includes signalling, transmission, crosstalk, compliance principles, port connection arrangements, and protection against over voltages induced in external cabling. Also gives definitions, tables, diagrams and annexes.