| Control Bus | Original bus (16-bit, 8 MHz, 10 megabytes per second) |
| Communication Bus | H.100 bus conformity (1024 time slots) |
| Switching | Non-blocking |
| Power Input | 100 V AC to 130 V AC; 1.3 A/200 V AC to 240 V AC; 0.8 A; 50 Hz/60 Hz |
| Power Consumption (When fully mounted) | 65 W (240V:142VA, 200V:134VA, 130V:119VA, 100V: 113VA) |
| Maximum Power Failure Tolerance*1 | 300 ms |
| Memory Backup Duration | 7 years |
| Dialling | |
| CO Line | Dial Pulse (DP) 10 pps, 20 pps Tone (DTMF) Dialling |
| Extension | Dial Pulse (DP) 10 pps, 20 pps Tone (DTMF) Dialling |
| Mode Conversion | DP-DTMF, DTMF-DP |
| Ring Frequency | 20 Hz/25 Hz (selectable) |
| Central Office Loop Limit | 1600 Ω maximum |
| Operating Environment | |
| Temperature | 0 �C to 40 �C (32 �F to 104 �F) |
| Humidity | 10 % to 90 % (non-condensing) |
| Conference Call CO Line | From 10 x 3-party conference call to 4 x 8-party conference call |
| Music on Hold (MOH) | 1 port (Level Control: -6 dB to +6 dB per 3 dB) |
| MOH1: Selectable Internal/External Music Source port |
| Paging | |
| Internal | Level Control: -6 dB to +3 dB per 3 dB |
| External | 1 port (Volume Control: -15 dB to +6 dB per 3 dB) |
| Serial Interface Port | |
| RS-232C | 1 (maximum 115.2 kbps) |
| RJ45 Port | |
| MNT Port | 1 (for PC connection) |
| LAN Port | 1 (for LAN connection) |
| Extension Connection Cable | |
| SLT | 1-pair wire (T, R) |
| DPT | 1-pair wire (D1, D2) or 2-pair wire (T, R, D1, D2) |
| APT | 2-pair wire (T, R, D1, D2) |
| PT-interface CS | 1-pair wire (D1, D2) |
| PT-interface CS (High-density) | 4-pair wire (D1, D2) |
| DSS Console and Add-on Key Module | 1-pair wire (D1, D2) |
| Dimension | 430 mm (W) x 130 mm (H) x 340 mm (D) |
| Weight (when fully mounted) | under 8 kg |
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