HP 200 Series Services And Applications page 16

Features of HP Routers
WAN Connections and Services
WAN Ports
On the synchronous ports, wide area network connections are established
by connecting WAN-link-terminating equipment. This equipment, which
provides timing signals to the router's WAN interface, may be typically a data
service unit/channel service unit (DSU/CSU), a modem, or an ISDN terminal
adapter (using the V.25 bis standard protocol). The WAN port connectors on
the rear of the routers are 62-pin high-density female D-subminiature connec-
tors. When ordering the router, one of four types of personality cables is
selected for the WAN ports—to adapt the 62-pin interface to one of the four
WAN types: RS-232 or V.24/V.28 (with a 25-pin male connector), RS-422/449
or V.36 (with a 37-pin male connector), V.35 (with a 34-pin male connector),
and X.21 (with a 15-pin male connector).
X.25 WAN Links
AN HP router can transfer data through a public or private X.25
packet-switching network to another HP router. In addition, IP traffic from
the router can be sent through an X.25 network directly to any computer
system that supports the standard for IP encapsulation in X.25 (RFC 877).
HP routers' X.25 services comply with the CCITT 1984 recommendation for
X.25 and with the U.S. Defense Data Network (DDN) X.25 standard.
Switched virtual circuits (SVCs), statically configured SVCs, and permanent
virtual circuits (PVCs) are supported (up to a maximum of 255 virtual
circuits per interface module in the Router 650). Variable packet sizes from
16 to 2048 bytes are handled, and line speeds up to 64 kilobits per second are
handled.
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