You can configure a maximum of eight ports per card, however, the practical limit may be lower. The limit varies directly with the X.25 link speed for your network (usually measured in kilobits per second, or Kbits/sec.) and inversely with the speed of the connecting modems (usually measured as bits per second, or bps).
If your X.25 link is shared by other services in addition to Apple Remote Access, the actual limits may be even lower. In general, X.25 performance will always be somewhat lower with X.25 than with a modem-to-modem connection.
The following table gives you an idea of possible variations for the maximum practical ports per serial card:
| 9.6 Kbits/sec
link speed | 19.2 Kbits/sec
link speed | 56/64 Kbits/sec
link speed |
| all client modems 2400 bps | 3 ports per card | 6 ports per card | 8 ports per card |
| half 2400 / half 9600 bps modems | 1 port per card | 2 ports per card | 6 ports per card |
| all 9600 bps modems | 1 port per card | 2 ports per card | 4 ports per card |