3Com DIGITAL MODEM Computer System Requirements

Computer System Requirements 1-7
Computer System Requirements
* Two directory numbers are required for Models 3C872 and 3C877. This allows a voice call and a
call using the internal analog fax modem to occur at the same time.
Connect the model 3C871 or 3C872 3Com Impact digital
modem to an IBM-compatible computer. Connect the model
3C876 or 3C877 3Com Impact digital modem to an Apple
Macintosh computer. Connect the digital modem to a
computer that meets UL standards in the United States or is
certified to CSA standards in Canada.
Table 1-1 ISDN Ordering Information by Switch Type
ISDN Switch Type
ISDN Line
Configuration
Parameter
AT&Tâ 5ESS
Custom
AT&T 5ESS
National
ISDN-1
Northern
Telecomâ
DMS100
National
ISDN-1
Siemensâ
EWSD
National
ISDN-1
Line Code 2B1Q (no NT1
required)
2B1Q (no NT1
required)
2B1Q (no NT1
required)
2B1Q (no NT1
required)
Directory
Numbers
1*1*2 1*
Channels 2B alternate
circuit-switched
data and voice
2B alternate
circuit-switched
data and voice
2B alternate
circuit-switched
data and voice
2B alternate
circuit-switched
data and voice
Terminal Type A with
Point-to-Point
A with
Point-to-Point
Functional PVC 2 Functional
TEI Dynamic Dynamic Dynamic Dynamic
Call
Appearances
Idle Idle — —
Supplemental
Voice Features
None None None None
EKTS Features No No No No
D Channel
Packet
No No No No
B Channel
Packet
No No No No