| Control Bus |
| Original bus (16-bit, 24 MHz) |
| Switching |
| Space Division CMOS Crosspoint Switch |
| Power Input |
| 100 V AC to 240 V AC, 1.5A to 0.75A, 50 Hz/60 Hz |
| External Battery |
| +24 V DC (+12 V DC × 2) |
| Maximum Power Failure Tolerance |
| 300 ms (without using backup batteries) |
| Memory Backup Duration |
| 7 years |
| Dialling |
| Outside (CO) Line |
| Pulse (10 pps, 20 pps) or Tone (DTMF) |
| Extension |
| Pulse (10 pps, 20 pps) or Tone (DTMF) |
| Intercom Path |
| 4 |
| Mode Conversion |
| Pulse-DTMF |
| Ring Frequency |
| 20 Hz/25 Hz (selectable) |
| Operating Environment |
| Temperature |
0  to 40 |
| Humidity |
| 10 % to 90 % (non-condensing) |
| Conference Call Outside (CO) Line |
| 2 |
| Music on Hold (MOH) |
| 1 port Selectable MOH: Internal/External/Tone |
| Paging |
| Internal |
| 1 |
| External |
| 1 port |
| Serial Interface Port |
| RS-232C |
| 1 |
| USB 1.1 |
| 1 |
| Extension Connection Cable |
| SLT |
| 1-pair wire (T, R) |
| PT |
| 2-pair wire (T, R, H, L) |
| DSS Console |
| 1-pair wire (H, L) |
| Dimensions |
| 368 mm (W) × 284 mm (H) × 102 mm (D) |
| Weight (when fully expanded) |
| Approx. 3.5 kg |