Alcatel-Lucent 7750 Service Router
A l c a t e l - L u c e n t H i g h - S c a l e M e d i a D e p e n d e n t A d a p t e r
The Alcatel-Lucent 7750 Service Router (SR) with High-Scale Media Dependent Adapter (HS-MDA) extends the service-rich capabilities of the industry-leading 7750 SR by enhancing the scale, density and granularity of service queues. Intended for very large-scale deployments of legacy and emerging residential, business and mobile services, the HS-MDA optimizes the 7750 SR performance for delivering packet services engineered with high statistical gain at the unified IP/MPLS and Carrier Ethernet service edge.
The 7750 SR supports the HS-MDA as a hot-swappable, half-slot module with 10 ports for Gigabit Ethernet (GigE). Each port is compatible with optical GigE Small Form Factor Pluggable (SFP) transceivers (see Table 1).
Features
•Supports 160,000 ingress queues and 160,000 egress queues on each 7750
SR HS-MDA, providing each of 20,000 subscribers with eight queues and eight separate scheduling classes
•Uses a port-based scheduler, with eight strict priority schedulers, for each HS-MDA egress port:
¬Allows configuring each strict scheduler per egress port with a shaping rate, limiting the amount of bandwidth allowed for that level
¬Supports weighted servicing for selected scheduling classes by using two weighted groups, allowing flexible usage
•Supports 64 egress secondary shapers, providing a control mechanism to prevent downstream overruns
at specific access nodes:
¬Locates each shaper before the egress port scheduler in the data path, ensuring that when a particular destination’s configured peak information rate (PIR) is exceeded, all queues for that destination will stop. This is done for each queue group that has a per-subscriber context.
•Offers an onboard, robust, flexible and deep buffer-pool hierarchy:
¬Provides one million ingress and one million egress buffers for packet processing
¬Uses two random early detection (RED) slopes on each queue for very granular buffer-pool management
¬Offers three levels of on-board flexible buffer hierarchy: portclass buffer pools, class pools and root pools
•Supports byte fairness to ensure bandwidth is scheduled equally between flows of same-priority traffic with wide variations in packet size
•Delivers an expanded set of counters for each subscriber context, totaling
16 sets with each counter set, tracking stats such as:
¬Discarded low-priority packets and octets
¬Discarded high-priority packets and octets
¬Forwarded low-priority packets and octets
¬Forwarded high-priority packets and octets
•Provides additional capabilities for managing congestion through egress 802.1p bit re-marking, based on the committed information rate (CIR) state
•Supports ingress queue (color-aware) policing where a CIR leaky-bucket is configured with a threshold:
¬Discards all packets that exceed this CIR threshold
¬Offers an alternative to using PIR shaping with maximum burst size (MBS) where eliminating jitter is important
•Supports a CIR bypass-mode when using ingress queue policing, allowing packets with trusted markings to ignore the CIR processing. PIR processing will still be enforced:
¬Forwards packets with un-trusted markings with the usual CIR and PIR processing enforcements
¬Ensures that trusted packets enjoy preferential treatment when CIR is a factor
Benefits
The HS-MDA is ideal for large-scale service deployments requiring high scale, high density and fine granularity of queues. The benefits of enhancing the 7750 SR with the HS-MDA include:
•Delivers high queuing densities, the equivalent of 19.2 million queues per rack, reducing demand on scarce and costly facility space within central offices (COs)
•Allows multiple HS-MDAs to be flexibly deployed as and where required, creating an on-demand and servicerich operating environment fully interoperable with other MDA-types
•Ensures end users enjoy the highest quality of experience (QoE) by being fully integrated with the depth and breadth of all service-rich 7750 SR capabilities
•Offers service providers a Broadband
Remote Access Server (BRAS) replacement plan that, combined with other 7750 SR features and functions, leverages investment in a strategic next-generation IP/MPLS and Carrier Ethernet service edge to consolidate legacy high-speed Internet (HSI) services and subscriber authentication
•Provides service providers with the scale, density and queuing granularity to embrace emerging service requirements for mass-market residential, business and mobile offerings, including those delivered in conjunction with the Alcatel-Lucent Application Assurance Integrated Service Adapter (AA-ISA) for applicationbased policy
Table 1. SFPs available for the HS-MDA
Part number |
Interface type |
Subtype |
Connector |
Fiber type |
Wavelength |
Power |
rAnge |
3HE00028AA |
GigE SFP |
LX |
SFP-LC |
Single mode |
1310 nm |
11 dB |
10 km |
3HE00027AA |
GigE SFP |
SX |
SFP-LC |
Multimode |
850 nm |
7.5 dB |
550 m |
3HE00867AA |
GigE SFP |
eX |
SFP-LC |
Single mode |
1310 nm |
18 dB |
40 km |
3HE00029AA |
GigE SFP |
ZX |
SFP-LC |
Single mode |
1550 nm |
24 dB |
70 km |
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2 Alcatel-Lucent 7750 Service Router | Data Sheet
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