Switching Systems and Call Centers
ETCE-D - Digital Telephone Exchange - more
What is ETCE-D?
- The ETCE-D is a special digital telephone exchange dedicated to electric power communications network that satisfies following requirements. The exchange ETCE-D
- must offer all advantages of modern technic
- must keep all good characteristics of analog exchanges
- must be compatible with existing network.
On the exchange ETCE-D
The ETCE-D is fourth type (first digital) of exchanges developed in IRITEL and dedicated to telephone network (TN) of electric power industry (EPI).
The ETCE-D has certificate/approval of Yugoslav Electric power industry, No 84/2, 22.4.2003.
Each ETCE-D has the characteristics of local, transit, PABX and manual exchange.
ETCE-D is developed according to Technical requirements of TN EPI and according to ITU-T recommendations for digital exchanges. It consists of the following parts: switching network, line circuits, network interfaces, peripheral processor units, central processor unit, operator console and set for emergency operation.
Switching network is non-blocking digital network for switching channels with rate 64kb/s.
Line circuits provide all BORSCHT functions.
There are two types of digital network interfaces. One is standard A interface and the other is codirectional 64 kb/s interface according to ITU-T Rec. G.703.1.
There is one analog interface dedicated to operation in period of digitalization.
The peripheral processor unit controls a number of lines and/or network interfaces.
The central processor unit controls all peripheral processor units and operator set.
The main trunks may be monitored and managed by the operator set.
The functions of PABX are provided by the operator set.
The set for emergency operation makes possible to establish some most important connections during exchange failure.
Main characteristics of ETCE-D are high availability, adaptable numbering system, fast and adaptable network signaling system, fast operator set, set for emergency operation, remote monitoring.
ETCE-D is designed and developed in IRITEL's MATN*'** group.
* MATN - acronym of: MAsters of Telecommunications Networks
** MATN - acronym of: Markov, Arsić, Trenkić, Nedelicki
Number and types of users and network interfaces
- Two standard versions are available: 60 (V1) and 120 (V2) users + network interfaces. Greater versions may be delivered according to the needs and contract.
- The user sets are:
- standard telephone set,
- telephone set with local battery (LB),
- telephone set without dialing, (CB), cordless telephone set (DECT)
- The network interfaces are:
- analog for power line carriers,
- analog for public telephone network,
- digital 2 Mb/s (A), G.703. nx64kb/s,
- digital 64kb/s, G.703.1.
- The number of users to number of interfaces ratio may be chosen according to the need.
The numbering scheme
The numbering scheme may be chosen according to the need. Abbreviated dialing is possible. The sending of dialed or changed called numbers is possible. All dialing possibilities for TN of EPI are provided.
Signaling
User signaling is standardized according to technical requirements of TN of EPI (decadic, DTMF). All parameters of dialing (duration of pulses and pauses etc.) are changeable.
The network signaling may be E&M and R2 signaling. A special signaling system, called R2+, is developed for TN of EPI. This signaling system enables the interworking of digital and analog parts of TN of EPI.
Loss and efficiency of the exchange ETCE-D
The switching network is non-blocking. The number of outgoing, incoming and transit connections is not limited.
Through-connection time is cca 30ms.
The incoming response time is shorter than 100ms.
Alerting sending delay time is shorter than 100ms.
All channels are available for both-way operation. The collision resolution procedure is provided. The number of DTMF receivers is equal to the number of users.
The number of R2 senders and receivers is equal to the number of digital network interfaces.
The attenuation loss, crosstalk, symmetry, noise etc are according to technical requirements of EPI.
The operator set
This is very effective and fast touch screen controlled by high quality PC. It is connected to the exchange by a wire or optical 9.6kb/s link. Longest distance between the operator set and the ETCE-D is 100m (wire connection) or 500m (optical connection). Duration of message (that may contain one calling figure) sent from operator set to ETCE-D (and vice versa) is cca 10ms.
Operator has possibility to dial in four ways: decadic and DTMF by the operator's telephone set and by touch screen "figure by figure" and "en bloc" by the touch screen directory.
The operator's monitor shows the state of important channels and connection.
All operators' possibilities as: answering, dialing, channel reservation, turning-off the faulty channel etc are enabled by the touch screen monitor.
In the absence of operator the "night service" may be active.
In the case of operator set failure the turning to the "night service" is done automatically.
Operation of the ETCE-D cannot be influenced by faulty operation of operator set.
Operator set of ETCE-D Banja Luka 6
Remote monitoring
Every interface may be point of monitoring. In that way, using alternate routing the exchange may be monitored by more than one direction.
The operation protection
The protection against operator's failure is performed by the "night service" set.
The protection against the "catastrophic" failures is done by the set for emergency operation (SEO).
The protection against the power supply failures is performed by the power supply for SEO.
The protection against illegal change of exchange parameters is done by passwords. Overvoltage protection is performed by the circuit design, fast and robust elements.
Power supply
Standard power supply is from mains 220V, 50Hz. Power consumption is less than 100W (V1) and less than 200W (V2).
Dimensions
Dimensions of exchange are 160x60x50 cm. The circuitry of the exchange is available from all sides thanking to the rotating frame.
List of mounted telephone exchanges of type etce in telecommunication network of electric-power industry
1 |
60A |
Valjevo |
2 |
60A |
Sremska Mitrovica |
3 |
60A |
Valač |
4 |
60A |
Novi Sad |
5 |
60A |
Zrenjanin |
6 |
60A |
Beograd XVII |
7 |
60A |
Beograd VIII |
8 |
60A |
Požega |
9 |
60A |
Kragujevac |
10 |
60A |
Leskovac |
11 |
60A |
Priština |
12 |
60A |
TE Kosovo A |
13 |
60A |
TS Kosovo B |
14 |
60A |
HE Gazivode |
15 |
60A |
Prizren |
16 |
60A |
Veles |
17 |
60A |
Negotino |
18 |
60A |
Kavadarci |
19 |
60A |
Štip |
20 |
60A |
Oslomej |
21 |
60A |
Prilep |
22 |
60A |
Zenica |
23 |
60A |
Budžak-Banja Luka |
24 |
60A |
Prozor |
25 |
60A |
Grabovica |
26 |
60B |
Grančarevo-Gacko |
27 |
120C |
DC Sarajevo |
28 |
120B |
TS Trebinje |
29 |
120B |
HE Čapljina |
30 |
60B |
Lukavac |
31 |
60B |
Gradačac |
32 |
60B |
Subotica |
33 |
60B |
Bijelo Polje |
34 |
60B |
Bočac |
35 |
120B |
Beograd III |
36 |
60B |
Pančevo |
37 |
60B |
Jajce I |
38 |
60B |
Jajce II |
39 |
60B |
Beograd V |
40 |
60B |
Šabac |
41 |
60B |
Valjevo |
42 |
60B |
Kraljevo |
43 |
60B |
Svetozarevo |
44 |
120B |
Kruševac |
45 |
120B |
Niš II |
46 |
60B |
Soviet Union I |
47 |
60B |
Soviet Union II |
48 |
60B |
Soviet Union III |
49 |
60BC |
Czechoslovakia |
50 |
120B |
TENT Obrenovac B |
51 |
120B |
HE Dubrovnik |
52 |
60B |
Pljevlja |
53 |
60B |
Gorica-Trebinje |
54 |
60B |
Titograd I |
55 |
120B |
Titograd II |
56 |
60B |
Budva |
57 |
60B |
Reljevo-Sarajevo |
58 |
60B |
Bihać |
59 |
60B |
TS Mostar III |
60 |
60C |
Bitolj I |
61 |
60B |
Ohrid |
62 |
60B |
Bitolj II |
63 |
60B |
Skoplje |
64 |
60B |
Mojkovac |
65 |
60B |
HE Vlasina I |
66 |
60B |
HE Vlasina II |
67 |
60B |
Novi Pazar |
68 |
60B |
TE Kolubara |
69 |
60B |
TE Drmno |
70 |
60B |
Zvornik |
71 |
60B |
Kokin Brod |
72 |
60B |
Srbobran |
73 |
120B |
TS Valjevo III |
74 |
120B |
TS Bor II |
75 |
60B |
Beograd XVII |
76 |
60B |
TS Majdanpek |
77 |
60B |
HE Globočica |
78 |
120B |
TENT Obrenovac A |
79 |
120B |
Tuzla |
80 |
120B |
Banja Luka |
81 |
120B |
TS Raštani-Mostar |
82 |
120B |
TS Čule-Mostar |
83 |
120B |
HE Ožbalt-Maribor |
84 |
120A |
HE Fala-Maribor |
85 |
120A |
HE Vuzenica-Maribor |
86 |
60B |
TE Kakanj |
87 |
60B |
ED Bitolj |
88 |
60B |
TS Kakanj |
89 |
60B |
TS Čacak III |
90 |
120A |
HE Vuhred-Maribor |
91 |
60B |
TS Višegrad |
92 |
60D |
Banja Luka-Ramići |
93 |
60D |
TS Valjevo III |
94 |
60D |
TS Subotica |
95 |
60D |
TS Srbobran |
96 |
60D |
TS Zrenjanin |
References on the power line communications
- 1. Ž. Markov: Processing of telephone calls in the exchange ETCE-60A in communications network of electric power industry, Elektrotehnika, 3/77 (in Serbian)
- 2. Ž. Markov: The overvoltage protection of electronic telephone exchanges in the electric power network, Elektrotehnika, 5/82 (in Serbian)
- 3. Ž. Markov: The comparison of modern components for overvoltage protection, Elektrotehnika, 10/87 (in Serbian)
- 4. Ž. Markov, I. Petković: EATC-60BČ: Telephone exchange dedicated to electric power network of Czechoslovakia, Elektrotehnika, 7-8/88 (in Serbian)
- 5. Ž. Markov and B. Trenkić: On the signaling system R2+ proposed for digital telephone network of electric power industry of Serbia (EPIS), V TELFOR, Belgrade, November 1997, (in Serbian)
- 6. M. Manojlović, M. Beleslin, B. Perašević and Ž. Markov: The proposal of new telephone network of EPIS with remarks concerning the application in distribution organizations, CIRED, First symposium on the distribution networks, Zlatibor, October 1998, (in Serbian)
- 7. Ž. Markov, Z. Arsić, B. Trenkić, Z. Nedelicki, M. Beleslin, M. Manojlović and T. Savović: On the new SEPI telephone network, VI TELFOR, Belgrade, November 1998
- 8. Ž. Markov, Z. Arsić, B. Trenkić and Z. Nedelicki: On the new telephone exchange ETCE-D, VI TELFOR, Belgrade, November 1998
- 9. Ž. Markov, Z. Arsić, B. Trenkić and Z. Nedelicki: Digital telephone network of Serbian Electric Power Industry-draft, 1998, (in Serbian)
- 10. Ž. Markov and D. Mitić: Codirectional 64kb/s digital interface as an interexchange trunk in power lines telephone network, Int. J. Electron. Commun., (AEU), 4/99
- 11. Ž. Markov: New R2 interexchange signaling dedicated to digital power line carriers, Int. J. Electron. Common., (AEU), 5/99
- 12. T. Savović, B. Banjac, D. Maksić, M. Stanojević, D. Jovanović, Z. Nedelicki, B. Trenkić, Ž. Markov: Telephone exchange ETCE-D: Network node where analog, digital and packet PLCs meet, TELFOR 2003, Belgrade, November 2003 (in Serbian)
- 13. T. Savović, D. Maksić, B. Banjac, Ž. Markov: Quality estimation of IP telephone conversations in the future EPS telephone network, 12th JUKO CIGRE symposium, Becici, may 2004. (in Serbian)
- 14. Ž. Markov: Estimation of telephone speech signal impairment due to disturbances in EPS IP network, Elektroprivreda 2/04, (in Serbian).
- 15. Ž. Markov: On the numbering scheme of the EPS telephone network, Elektroprivreda 1/05, (in Serbian)
- 16. Ž. Markov: The 30th anniversary of power line telephone exchanges ETCE, Elektroprivreda 2/05 (in Serbian)
- 17. Ž. Markov and G. Nedić: What ISDN technolodgy should bring to EPS telephone network, Elektroprivreda, 4/05 (in Serbian)
- 18. Ž. Markov: About the impairment adition in IP telephony, Telekomunikacije, 1/06 (in Srbian)
- 19. Ž. Markov: On the interface between classic classic and IP telephone network, Telekomunikacije, 1/06 (in Serbian)
- 20. Ž. Markov: About mixed corporate telephone network, Elektroprivreda 2/06 (in Serbian)
- 21. Ž. Markov: About transit telephone connections in the EPS network, Elektroprivreda 3/06 (in Serbian)
- 22. Ž. Markov: On the disturbance models in EPS telecommunication networks, Elektroprivreda, 1/07, (in Serbian)
- 23. Ž. Markov i G. Nedić: Calculation of allowed packet loss in EPS IP telephone network, Elektroprivreda 3/07, (in Serbian)
- 24. Ž. Markov: On the telephone call forwarding in classic and IP telephone network of EPS, Elektroprivreda 3/08, (in Serbian)
- 25. Ž. Markov: Calculation of common control unit in EPS packet network, Elektroprivreda, 1/09, (in Serbian)
- 26. Ž. Markov: On the technical requirements for EPS telephone network, Elektroprivreda, 2/09, (in Serbian)
- 27. Ž. Markov: On the calculation of needed link bitrates in EPS packet network, Elektroprivreda, 4/09, (in Serbian)
- 28. Ž. Markov: Burst packet loss in packet telephone network of Serbian Electric Power Utility, Elektroprivreda, ISSN 0013-5755, vol. LXIII, no 1, 2010., pp 65-68. (in Serbian)
- 29. Ž. Markov: Proposal of new numbering plan of telephone network of Serbian Electric Power Utility, Elektroprivreda, ISSN 0013-5755, vol. LXIII, no 2, 2010., pp 176-179. (in Serbian)
- 30. D. Mitić, A. Lebl and Ž. Markov: Model of Digital and Signal Channel in the Network of Serbian Electric Power Industry, FACTA UNIVERSITATIS (NIŠ), ISSN 0353-3670, ser.:elec. energ.,. vol. 23, Dec. 2010, pp 311-318.
- 31. B. Trenkić i Ž. Markov: Two agorithms for avoiding congestion in EPS telephone network, Elektroprivreda, ISSN 0013-5755, vol. LXIV, no 1, 2011., pp 74-78. (in Serbian)
- 32. Ž. Markov: Proposal of one method of failure monitoring in mixed EPS telephone network, Elektroprivreda, ISSN 0013-5755, vol. LXIV, no 2, 2011., pp 173-176. (in Serbian)
- 33. A. Lebl, D. Mitić, Ž. Markov: Influence of connection lenght on speech signal quality in packet network of electric power utility, Revue Roumaine des sciences techniques, ISSN 0035 4066, vol. 56 (2011), no. 3, pp 266-304
Data sheets (pdf)