Perle Systems IOLINK-PRO IOLINK-520 - Manual (Page 21)

Introduction
1.20 — IOLINK-PRO & 520 Reference Manual
Multipoint
A simple Multipoint configuration would consist of a head office and two remote offices. Cost comparisons might
reveal that it is less expensive to use a dial-up line during business hours only instead of a permanent leased line.
One IOLINK router will be installed at each office (for a total of three units). Each IOLINK router at the remote
office locations will connect to a separate link on the IOLINK router at the head office. The link from each
bridge/router will be connected to a dial modem. Set the link operation of both links on the bridge/router at the
head office to Conditional, and then enter a time schedule for each link by using the Time Schedule option of the
Link Activation Conditions Menu. The modems connected to the head-office bridge/router will each have an
autodial number of one of the modems at the remote offices. With the time schedule set to have the link active from
8 am to 6 pm each day of the week, the IOLINK router will establish the link and keep it active during those hours
only.
Disaster Recovery Backup Link
Each Single Active Link IOLINK router has the ability to activate a secondary link when the main link fails. This secondary
link may be connected to a dial-up modem or ISDN service, so it can be used if something should happen to the main link.
The secondary link is available only for a disaster-recovery situation.
ISDN Single Active Link & Dual Active Link
On Single Active Link ISDN IOLINK Routers, when the WAN Environment option is set to Multipoint, only ISDN call 1 is
available; ISDN call 2 is disabled. A Single Active Link ISDN IOLINK router will be able to use both ISDN calls to connect
in a Point-to-Point topology to another ISDN IOLINK router.
On Dual Active Link ISDN IOLINK Routers, the WAN Environment option may be set to either Point-to-Point or
Multipoint. Both ISDN calls may be used to connect to the same ISDN IOLINK router or to two other ISDN IOLINK
routers.
Operating Software Upgrades
The IOLINK router includes flash memory, that allows new system code to be downloaded using the Trivial File Transfer
Protocol (TFTP). This allows software updates to be performed quickly and painlessly from a host server (with TFTP
capabilities) on the network.
The IOLINK Router also allows the downloading of software updates by using a direct management port connection and the
ZMODEM transfer protocol.