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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 to Table 2-4 provide R2 signaling information based on ITU Q.441 as it applies specifically to the Korean telephone network.
| Token Data Field | Designation | Frequencies | 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 | — |
12 | G-I-12 | 1500 + 1980 Hz | Reject |
13 | G-I-13 | 1620 + 1980 Hz | Maintenance |
14 | G-I-14 | 1749 + 1980 Hz | — |
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 | Maintenance |
4 | G-II-4 | 1380 + 1740 Hz | Public Phone |
5 | G-II-5 | 1500 + 1740 Hz | Operator |
6 | G-II-6 | 1620 + 1740 Hz | Data |
7 | G-II-7 | 1380 + 1860 Hz | — |
8 | G-II-8 | 1500 + 1860 Hz | — |
9 | G-II-9 | 1620 + 1860 Hz | — |
10 | G-II-10 | 1740 + 1860 Hz | — |
11 | G-II-11 | 1380 + 1980 Hz | — |
12 | G-II-12 | 1500 + 1980 Hz | — |
13 | G-II-13 | 1620 + 1980 Hz | — |
14 | G-II-14 | 1740 + 1980 Hz | — |
15 | G-II-15 | 1860 + 1980 Hz | — |
| Token Data Field | Designation | Frequencies | Meaning |
|---|---|---|---|
1 | A-1 | 1140 + 1020 Hz | Send next digit (n+1) |
2 | A-2 | 1140 + 900 Hz | Send previous digit |
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 and change to Group C signals |
6 | A-6 | 900 + 780 Hz | Number complete charge, setup voice path |
7 | A-7 | 1140 + 660 Hz | Send second previous digit |
8 | A-8 | 1020 + 660 Hz | Send third previous digit |
9 | A-9 | 900 + 660 Hz | Start from first digit |
10 | A-10 | 780 + 660 Hz | — |
11 | A-11 | 1140 + 540 Hz | — |
12 | A-12 | 1020 + 540 Hz | — |
13 | A-13 | 900 + 540 Hz | — |
14 | A-14 | 780 + 540 Hz | — |
15 | A-15 | 660 + 540 Hz | — |
| Token Data Field | Designation | Frequencies | Meaning |
|---|---|---|---|
1 | B-1 | 1140 + 1020 Hz | Not applicable |
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 | Out of order |
9 | B-9 | 900 + 660 Hz | — |
10 | B-10 | 780 + 660 Hz | — |
11 | B-11 | 1140 + 540 Hz | — |
12 | B-12 | 1020 + 540 Hz | — |
13 | B-13 | 900 + 540 Hz | — |
14 | B-14 | 780 + 540 Hz | — |
15 | B-15 | 660 + 540 Hz | — |
| Token Data Field | Designation | Frequencies | Meaning |
|---|---|---|---|
1 | C-1 | 1140 + 1020 Hz | Send next digit (n+1) |
2 | C-2 | 1140 + 900 Hz | Send previous digit |
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 next number of subscriber B |
6 | C-6 | 900 + 780 Hz | Number complete charge, setup voice path |
7 | C-7 | 1140 + 660 Hz | Send second previous digit |
8 | C-8 | 1020 + 660 Hz | Send third previous digit |
9 | C-9 | 900 + 660 Hz | Start from first digit |
10 | C-10 | 780 + 660 Hz | — |
11 | C-11 | 1140 + 540 Hz | — |
12 | C-12 | 1020 + 540 Hz | — |
13 | C-13 | 900 + 540 Hz | — |
14 | C-14 | 780 + 540 Hz | — |
15 | C-15 | 660 + 540 Hz | — |
Table 2-6 describes the 2-bit, channel-associated PCM line signaling used by VCO systems that are equipped with E1 cards. Originating or outgoing ports use forward signals, while incoming ports generate backward signals. For more information on E1 cards, refer to the Cisco VCO/4K Card Technical Descriptions.
| Token Data Field | Signal | Forward Af Bf | Backward 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 | 0 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 20:46:48 PDT 2002
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