Cabletron Systems SmartSwitch SBU128, Руководство пользователя

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The Hardware
80-10200000-01 2–7
All Non Volatile Options are set during manufacture and must
not be changed, except by a competent engineer.
Network Variant 0 is for most European networks, most other countries
with Euro-ISDN are likely to require Network Variant 0. Network
Variant 2 is the same as Variant 0 except that it does not have single
octet information elements present in the call setup message.
Please contact your Technical Support for further information.
NOTE: Network Variants 1 onwards must not be set in the UK,
otherwise the Approval of this product will be invalidated.
Changes to this setting must only be made by a competent
engineer.
2.6.2 S-Bus Power Detection
S-Bus Power Detection must be enabled for all UK and European ISDN
applications, where ‘Power Source 1’ detection is a regulatory
requirement. Where ‘Power Source 1’ is not provided (i.e. on some PBX
internal ISDN extensions), S-Bus Power Detection should be disabled,
otherwise ISDN calls will not be possible.
Presence of ‘Power Source 1’ is where 40V DC power is applied by the
network between the transmit and receive ‘S’ bus pairs. Enabling power
source detection means that line power must be present before calls can
be made or received.
All Non Volatile Options will be set during manufacture and
must not be changed, except by a competent engineer.
It is possible that a designated “country” variant could be used in another
country if approvals in that country permit it.
If an SBU128 is upgraded with later software, please contact your local
Technical Support organisation for further information.