Connection Options - Nortel Remote Office 9150 Installation And Administration Manual

September 2001

Connection options

Communications between the Remote Office 9150 unit in your office and the
host PBX take place using 10BaseT Ethernet or ISDN BRI connections, or both.
This section provides a description of each of these connections.
10BaseT Ethernet interface
Voice over IP technology is used to carry voice conversation and phoneset
control signals over your IP network to the host PBX. The voice data is
forwarded as UDP/IP packets, and the signaling data is forwarded as TCP/IP
packets.
ISDN BRI lines to PSTN
The PSTN provides a cost-effective alternative to leased lines. You can use
ISDN BRI lines at the Remote Office 9150 site to make local calls without
involving the host PBX. You can also choose to use the ISDN BRI lines instead
of the IP network to route calls through the host PBX.
To use ISDN BRI lines, you must install trunk interface modules. The Remote
Office 9150 unit can support up to four U or S/T ISDN BRI trunk interface
modules. (See "Add-on modules description" on page 15.)
Quality of Service transitioning technology
If both the IP network and ISDN BRI lines are used, you can use the QoS
transitioning technology to reroute calls from the IP network to the PSTN when
the QoS on the IP network degrades. When the QoS returns to normal, the QoS
transitioning technology automatically moves the calls back to the IP network.
The Remote Office 9150 unit monitors the QoS on the IP network. If the QoS
falls below preprogrammed acceptable thresholds, calls are dynamically and
transparently switched to the ISDN BRI lines. See "Quality of Service
transitioning technology" on page 39 for additional details.
Installation and Administration Guide
Remote Office 9150 description
17