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This chapter describes the R2 signaling tones generated and detected by the MFCR2 transceiver cards, and the R2 pulse code modulation (PCM) 2-bit line signaling transmitted and received by E1 spans.
Table 2-1 through Table 2-5 provide R2 signaling information based on ITU Q.441 as it applies specifically to the Venezuela telephone network.
| Token Data Field | Designation | Frequencies | Digit Meaning |
|---|---|---|---|
1 | G-I-1 | 1380 + 1500 Hz | Digit 1 |
2 | G-I-2 | 1380 + 1620 Hz | Digit 2 |
3 | G-I-3 | 1500 + 1620 Hz | Digit 3 |
4 | G-I-4 | 1380 + 1740 Hz | Digit 4 |
5 | G-I-5 | 1500 + 1740 Hz | Digit 5 |
6 | G-I-6 | 1620 + 1740 Hz | Digit 6 |
7 | G-I-7 | 1380 + 1860 Hz | Digit 7 |
8 | G-I-8 | 1500 + 1860 Hz | Digit 8 |
9 | G-I-9 | 1620 + 1860 Hz | Digit 9 |
10 | G-I-10 | 1740 + 1860 Hz | Digit 0 |
11 | G-I-11 | 1380 + 1980 Hz | Not applicable |
12 | G-I-12 | 1500 + 1980 Hz | Request not accepted (exchange without ANUM) |
13 | G-I-13 | 1620 + 1980 Hz | Not applicable |
14 | G-I-14 | 1749 + 1980 Hz | Access to announcement |
15 | G-I-15 | 1860 + 1980 Hz | End of number |
| Token Data Field | Designation | Frequencies | Meaning |
|---|---|---|---|
1 | G-II-1 | 1380 + 1500 Hz | Subscriber without priority |
2 | G-II-2 | 1380 + 1620 Hz | Subscriber with priority |
3 | G-II-3 | 1500 + 1620 Hz | Test equipment |
4 | G-II-4 | 1380 + 1740 Hz | Coin box |
5 | G-II-5 | 1500 + 1740 Hz | Operator |
6 | G-II-6 | 1620 + 1740 Hz | Data transmission |
7 | G-II-7 | 1380 + 1860 Hz | Redirect call |
8 | G-II-8 | 1500 + 1860 Hz | Not applicable |
9 | G-II-9 | 1620 + 1860 Hz | Not applicable |
10 | G-II-10 | 1740 + 1860 Hz | Not applicable |
11 | G-II-11 | 1380 + 1980 Hz | Not applicable |
12 | G-II-12 | 1500 + 1980 Hz | Not applicable |
13 | G-II-13 | 1620 + 1980 Hz | Not applicable |
14 | G-II-14 | 1740 + 1980 Hz | Not applicable |
15 | G-II-15 | 1860 + 1980 Hz | Not applicable |
| Token Data Field | Designation | Frequencies | Meaning |
|---|---|---|---|
1 | A-1 | 1140 + 1020 Hz | Send next BNUM digit (n + 1) |
2 | A-2 | 1140 + 900 Hz | Send previous digit (n - 1) |
3 | A-3 | 1020 + 900 Hz | Number complete send category; change over to reception of Group B signals |
4 | A-4 | 1140 + 780 Hz | Network congestion |
5 | A-5 | 1020 + 780 Hz | Send category only |
6 | A-6 | 900 + 780 Hz | Number complete charge, set up voice path |
7 | A-7 | 1140 + 660 Hz | Send second previous digit (n - 2) |
8 | A-8 | 1020 + 660 Hz | Send third previous digit (n - 3) |
9 | A-9 | 900 + 660 Hz | Send next ANUM digit (n + 1) |
10 | A-10 | 780 + 660 Hz | Not applicable |
11 | A-11 | 1140 + 540 Hz | Not applicable |
12 | A-12 | 1020 + 540 Hz | Not applicable |
13 | A-13 | 900 + 540 Hz | Not applicable |
14 | A-14 | 780 + 540 Hz | Not applicable |
15 | A-15 | 660 + 540 Hz | Not applicable |
| Token Data Field | Designation | Frequencies | Meaning |
|---|---|---|---|
1 | B-1 | 1140 + 1020 Hz | Subscriber line free with charge |
2 | B-2 | 1140 + 900 Hz | Number changed |
3 | B-3 | 1020 + 900 Hz | Busy |
4 | B-4 | 1140 + 780 Hz | Congestion |
5 | B-5 | 1020 + 780 Hz | Unallocated number |
6 | B-6 | 900 + 780 Hz | Line free with charging |
7 | B-7 | 1140 + 660 Hz | Line free, no charge |
8 | B-8 | 1020 + 660 Hz | Line barred to incoming traffic |
9 | B-9 | 900 + 660 Hz | Subscriber line intercepted |
10 | B-10 | 780 + 660 Hz | Data transmission |
11 | B-11 | 1140 + 540 Hz | Not applicable |
12 | B-12 | 1020 + 540 Hz | Not applicable |
13 | B-13 | 900 + 540 Hz | Not applicable |
14 | B-14 | 780 + 540 Hz | Not applicable |
15 | B-15 | 660 + 540 Hz | Not applicable |
| Token Data Field | Designation | Frequencies | Meaning |
|---|---|---|---|
1 | C-1 | 1140 + 1020 Hz | Send next BNUM digit (n + 1) |
2 | C-2 | 1140 + 900 Hz | Send previous digit (n - 1) |
3 | C-3 | 1020 + 900 Hz | Number complete send category; change over to reception of Group B signals |
4 | C-4 | 1140 + 780 Hz | Network congestion |
5 | C-5 | 1020 + 780 Hz | Send category only |
6 | C-6 | 900 + 780 Hz | Number complete charge, set up voice path |
7 | C-7 | 1140 + 660 Hz | Send second previous digit (n - 1) |
8 | C-8 | 1020 + 660 Hz | Send third previous digit (n - 2) |
9 | C-9 | 900 + 660 Hz | Send next ANUM digit (n + 1) |
10 | C-10 | 780 + 660 Hz | Not applicable |
11 | C-11 | 1140 + 540 Hz | Not applicable |
12 | C-12 | 1020 + 540 Hz | Not applicable |
13 | C-13 | 900 + 540 Hz | Not applicable |
14 | C-14 | 780 + 540 Hz | Not applicable |
15 | C-15 | 660 + 540 Hz | Not applicable |
Table 2-6 describes the 2-bit, channel-associated pulse code modulation (PCM) line signaling used by the VCO system equipped with E1 interface cards. Forward signals are used by originating or outgoing ports, while backward signals are generated by incoming ports. For more information on E1 cards, refer to the Cisco VCO/4K Card Technical Descriptions.
| Number | Signal | Exchange Signaling Forward Backward | |
|---|---|---|---|
| Af Bf | Ab Bb | ||
1 | Idle | 1 0 | 1 0 |
2 | Seizure | 0 0 | 1 0 |
3 | Seizure acknowledge | 0 0 | 1 0 |
6a | Clear forward before answer | 1 0 | 1 1 |
Release guard | 1 0 | 1 0 | |
4 | Seize acknowledge | 0 0 | 1 1 |
4 | Answer | 0 0 | 0 1 |
6b | Clear forward after answer | 1 0 | 0 1 |
7b | Release guard | 1 0 | 1 0 |
5 | Clear-back | 0 0 | 1 1 |
6a | Clear forward after clear back | 1 0 | 1 1 |
7 | Release guard | 1 0 | 1 0 |
8 | Blocking | 1 0 | 1 1 |
9 | Unblocking | 1 0 | 0 0 |
Posted: Sat Sep 28 22:11:22 PDT 2002
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