3Com 510, 520, 530 manual Pack Contents Checklist

1-4 CHAPTER 1: GETTING STARTED

Using ISDN to Support Leased Line WAN Circuits

ISDN provides an ideal service to connect remote LANs. To be effective, the connecting bandwidth needed is at least 64 Kbps to achieve a realistic throughput. Slower speed links can be used but usually only when usage is low and infrequent, or if higher speed circuits cannot be provided.

Leased digital point-to-point circuits can still be cost effective if usage spans many hours per day. However as ISDN tariffs reduce, this balance also changes. ISDN can be used to provide effective backup of these point-to-point WAN circuits in two ways.

■Firstly, if the point-to-point circuit fails, an ISDN channel can be dialled-up automatically and quickly, to provide an alternative path to the remote unit.

■Secondly, if the leased circuit becomes heavily loaded due to peaks in the traffic between remote bridges or routers, additional bandwidth can be automatically dialled-up to supplement the bandwidth of the leased circuit. The interconnected bridges would then treat the leased line and ISDN channel as parallel links, sharing the load across the two.

Pack Contents Checklist

Before you install your OfficeConnect Remote, check the contents of the box against the pack contents checklist below. If any of the items have been damaged in transit or are missing, then contact the 3Com dealer from whom the equipment was purchased.

■1 x OfficeConnect Remote unit.

■1 x power adapter fitted with an appropriate plug for your national power supply.

■1 x 1.5 meter RJ45 to RJ45 male plug ISDN 2 connecting cable.

■1 x 1.5 meter DB9 to DB9 serial manager port cable.

■1 x British Telecom to RJ11 convertor (UK models of OfficeConnect Remote 520 and 530 only).

■1 x OfficeConnect Remote User Guide.

■1 x OfficeConnect Remote Software Reference guide.

■1 x Warranty Registration Card.

It is important that you save the unit’s box and protective packing material in case you need to store, or transport it in the future.