3Com Router 3000 Series, Manual, Page: 17 / 37

Synchronous/Asynchronous Serial Interface
Table 6 lists attributes of the synchronous/asynchronous serial interface.
ISDN U Port
Table 7 lists attributes of the ISDN U port.
Frame format Ethernet_II
Ethernet_SNAP
IEEE 802.2
IEEE 802.3
Operating mode 10/100Mbps autosensing
Full duplex/half duplex
Network protocol IP (Internet Protocol)
Novell IPX (Internet Packet Exchange)
Table 6 Attributes of the Synchronous/Asynchronous Serial Interface
Attribute
Description
Synchronous Asynchronous
Connector DB50
Interface standard
and operating
mode V.24 (EIA/
TIA-232) V.35 X.21 V.24 (EIA/TIA-232)
DTE, DCE DTE, DCE DTE DCE
Minimum baud
rate (bps) 1200 1200 1200 1200 300
Maximum baud
rate (bps) 64 k 2.048 M 2.048 M 2.048 M 115.2 k
Services Leased line
Terminal access
Backup
Modem dial-up
Backup
Protocols PPP
MP
LAPB (Link Access Protocol-Balanced)
HDLC (High-level Data Link Control)
SDLC (Synchronous Data Link Control)
X.25
Frame Relay
PPP
SLIP
MP
Table 7 Attributes of the ISDN U Port
Attribute Description
Connector RJ45
Protocol standards Complies with ITU-T I.430, Q.921 and Q.931 recommendations
Operating mode ISDN dial-up
ISDN leased line
Table 5 Attributes of the Fast Ethernet Interface (continued)
Attribute Description
3Com Router Release Notes for V1.20
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