Provider Reference Infrastructure Sharing Offer ______________________________________________________________________ 3.3. Specific Provisions applicable to Duct Service [Infrastructure Provider may determine specific provisions for this service, subject to approval by the Authority] 3.4. Specific Provisions applicable to Co-location Service [Infrastructure Provider may determine specific provisions for this service, subject to approval by the Authority] 4. Fault Escalation Process When the Parties cannot agree on one of the following:    Acceptance of fault ownership; fault status; or fault clearance procedure and time-scale, The Parties may refer to the escalation processes as set out in the Main Document of this Agreement and as detailed in the Operations & Maintenance Manual (Annex H). 5. Scheduled and Unscheduled Maintenance Scheduled Maintenance means any maintenance activities performed on the Infrastructure Provider network to which Infrastructure Seeker's facilities are connected provided that Infrastructure Seeker shall be given at least 15 week days' advance notice of such maintenance activities. Such activities are typically performed during the standard maintenance window on Sundays 00:01 and 6:00 am local time. Notice of scheduled maintenance shall be given to Infrastructure Seeker's designated Point of Contact, by a method elected by Infrastructure Provider (telephone, e-mail, fax). The Infrastructure Seeker may change its Point of Contact upon reasonable advance written notice to Infrastructure Provider. Unscheduled maintenance means any maintenance activities performed on the Infrastructure Provider network to which Infrastructure Seeker‟s facilities are connected as a result of a Threat or an Emergency. A Threat is defined as a situation or condition that would not normally cause an outage to a Infrastructure Seeker but introduces a very low risk to services or may lead to a brief service interruption. Examples include optical cable splicing, contractor working near Infrastructure Provider fiber cables and digging within three meters of an Infrastructure Provider fiber cable. In the case of a Threat Infrastructure Provider will strive to provide Infrastructure Seekers with three business days‟ advance notice. In the event of an Emergency (defined as unplanned critical repairs, acts of vandalism and/or nature that has caused or could cause a degradation or interruption of service) Infrastructure Provider will make best efforts to provide Infrastructure Seekers with short-term notice and an estimated time to repair. DATE Page 5