Carrier Optical Technical Description

SERVICE OVERVIEW Spectrum Business® Optical Ethernet Service is a scalable Supported MEF Supported fiber-optic solution providing a reliable alternative to Topology Certifications Speeds traditional TDM services. The service offers flexible bandwidth options ranging from 10Mbps to 10 Gbps, and EPL MEF 9 and MEF 14 10Mbps to 1Gbps is available in four service configurations: Ethernet Private EVPL MEF 9 and MEF 14 10Mbps to 10Gbps Line (EPL), Ethernet Virtual Private Line (EVPL), Access Access EPL MEF 9 and MEF 14 10Mbps to 1Gbps EPL and Access EVPL. All Service types are available regionally and across the national backbone. Access EVPL MEF 9 and MEF 14 10Mbps to 10Gbps

TECHNICAL SPECIFICATIONS User-to-Network Interface customer. The customer is not expected to configure Spectrum Business currently utilizes the Cisco ME 3400 their interface with any Spectrum EVC or OVC VLAN IDs. to support the following IEEE 802.3 interfaces at the UNI Technical coordination will be required to support stacked VLAN tags across the ENNI. Standard Interfaces UNI Speed Bandwidth Allocation 10BASE-T 10Mb The service can be configured to support two types of bandwidth profiles: 100BASE-TX 10Mb to 100Mb » Per UNI – UNI rate limiting. Dynamic allocation of 1000BASE-SX 100Mb to 1Gb bandwidth between all EVCs per specified UNI (i.e. all bandwidth is available for use for all EVCs). 1000BASE-LX 100Mb to 1Gb » Per EVC – allocation of bandwidth is rate-limited at 10GBASE-SX 1Gb to 10Gb the EVC 10GBASE-LX 1Gb to 10Gb EtherType 0x8100 EtherType is used for stacked VLAN tags

Ethernet Service Frame Handling Layer 2 Control Protocol (L2CP) Processing The services transparently pass all Unicast, Multicast and Broadcast frames associated with the EVC. The service Protocol Handling does not support IPv6 multicast. STP Tunnel

MTU Size RSTP Tunnel The services support a Maximum Transmission Unit (MTU) size of 2000 bytes for all configurations and MSTP Tunnel specific designs may support an MTU up to 8996 bytes PVST Tunnel

ENNI Specifications R-PVST Tunnel ENNI handoffs are optical GigE or 10GE. Bandwidth and the total number of EVC connections may be limited at EAPS Discard the ENNI. IEEE 802.3ad () is supported. Pause Discard

Ethernet OAM LACP/LAMP Peer Spectrum Business supports IEEE 802.1ag at the UNI and IEEE 802.1ag and ITU Y.1731 at the ENNI. Spectrum GARP/MRP Discard Business supports proprietary OAM functionalities as Link OAM Tunnel needed. Port Authentication Discard CE-VLAN tag Preservation The service supports 802.1ad (Q-in-Q) tagging at the UNI E-LMI Discard and ENNI. Spectrum Business will encapsulate customer LLDP Discard CE-VLAN tags in a provider VLAN tag for transport across the Charter Spectrum network. Untagged frames will be mapped to the native VLAN designated by the

Charter Communications Proprietary – to be distributed only with prior written consent MAC Address Limitations TECHNICAL SUPPORT, MONITORING Point to point service configurations (EPL, EVPL, Access AND MAINTENANCE EPL, Access EVPL) do not have MAC Address limitations. Spectrum Business provides 24x7x365 proactive Class of Service (CoS)/Traffic Prioritization monitoring of the service via the SB NOC. Reported Spectrum Business uses traffic prioritization to offer troubles are escalated within the NOC and to local network two classes of service for point to point Carrier service maintenance and repair technicians as necessary. On-site configurations (EPL, EVPL, Access EPL, Access EVPL): technicians are typically Spectrum Business employees » Premier CoS (Highest Priority) and reside locally to provide the quickest turnaround Express CoS (Intermediate priority) » possible. Customers are provided with a list of escalation Note: Standard CoS is the lowest priority CoS for Spectrum Business. contacts during the test and turn-up process. However, it is not offered/available for Carrier Channel services.

Spectrum Business indicates priority using the MPLS Proactive network maintenance will be conducted EXP bits. Customer markings (802.1p/DSCP) are passed between the hours of midnight and 6:00am local time. transparently through the Charter Spectrum network. In Spectrum Business will typically provide at least ten days addition, Spectrum Business invokes process to actively prior notice before preventative maintenance is conducted. manage oversubscription in the network. Emergency network maintenance is work that is not reasonably anticipated but requires immediate action to INSTALLATION, TESTING AND TURN-UP address an issue that is likely to cause a material service Prior to installation for most large customers, Spectrum outage. Spectrum Business will typically provide notice Business will create a Method of Procedure (MOP) which to the customer of emergency network maintenance as includes a detailed description of work to be performed soon as is practicable, and when reasonable, will do so in with consideration given to a review and approval process, advance of such maintenance. safety, power and grounding, cabling/fiber patching, escalation contacts and clean-up of the work area. SERVICE LEVEL AGREEMENTS (SLA) After installation, Spectrum Business performs RFC 2544 Spectrum Business offers Premier and Express Service testing from the customer UNI to the demarcation point Level Agreements corresponding with the CoS tier of a at the handoff location. The Spectrum technician then given service configuration. Premier and Express SLAs verifies monitoring is established with the Spectrum include four performance metrics: Availability, Delay Business Network Operations Center (SB NOC). Test (Round-Trip), Delay Variation, and Loss Ratio. These SLAs results are provided to the customer upon certification. are measured using Ethernet test frames injected into the Test & Turn-up will typically take one day. Charter Spectrum network with SLA results available in a monthly customer report.

Service Level Agreements for EPL, EVPL, Access EPL, Access EVPL (Point-to-Point) Mileage Band 0 < d < 100 Miles 100 < d < 250 Miles 250 < d < 500 Miles 500 < d < 1000 Miles 1000 < d < 1500 Miles Premier SLA

Availability 99.95% 99.95% 99.95% 99.95% 99.95%

Delay (Round-Trip) 10 ms 20 ms 40 ms 60 ms 80 ms

Delay Variation 2ms 2ms 2ms 2ms 2ms

Loss Ratio 0.05% 0.05% 0.05% 0.05% 0.05% Express SLA

Availability 99.9% 99.9% 99.9% 99.9% 99.9%

Delay (Round-Trip) 15 ms 30 ms 50 ms 80 ms 100 ms

Delay Variation 3ms 3ms 3ms 3ms 3ms

Loss Ratio 0.1% 0.1% 0.1% 0.1% 0.1%

CB-OETDSS Charter Communications Proprietary – to be distributed only with prior written consent