Cisco OL-4015-08 Guide de dépannage télécharger pdf (Page 35)

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide

OL-5169-01

Chapter 1 Solution Overview

Solution Components

The Cisco MGX 8850 provides the interface to a 911 tandem, or Public Safety Answering Point (PSAP),

and Operator Services by means of Feature Group D (FGD) trunks. All SS7-controlled bearer channels

(Inter-Machine Trunks or IMTs) from the Public Switched Telephone Network (PSTN) terminate here.

The Cisco MGX8850 Trunking Gateway is a scalable carrier class platform that delivers a complete

portfolio of voice services (trunking with PSTN) in combination with other BLISS for Cable components

and interconnects the BLISS for Cable IP infrastructure with the PSTN permitting the routing of voice,

modem, and fax traffic between the IP network and the PSTN.

All components of the Cisco MGX8850 are optionally redundant to 100-percent system redundancy,

including the control processor, IP modules, switching fabric, network interfaces, service interfaces,

critical backplane signals, power supplies, power modules, and cooling fans. All Trunking Gateways

must support redundant IP network interfaces with each interface able to handle the full capacity for

media streams based on fully loaded PSTN interconnect.

The Cisco MGX8850 platform can be configured with different combinations of line and processor

cards. The Cisco BLISS for Cable solution supports the following platform configurations:

• MGX8850/PXM1/RPM-XF/VISM-PR/SRM

• MGX8850/PXM45/RPM-XF/VISM-PR/SRM-E

The Cisco MGX8850 chassis supports up to 32 single-height front cards (or a number between 12 and

24 for a mix of single-height and double-height front cards). The Cisco MGX8850 supports up to 32 back

cards. Each double-height service module is capable of supporting two single-height back cards, and

each single-height front card is capable of supporting a single-height back card. Four back card slots are

dedicated to the Service Resource Modules and can be used to provide bulk distribution to the service

module slots. The final four back cards are dedicated to the redundant PXM modules. Each PXM has a

User Interface (UI) back card, and a back card with broadband ports.

Combinations of single-height and double-height service modules can coexist in a single Cisco

MGX8850 chassis subject to configuration rules. The single-height slots are easily converted into

double-height slots by removing a slot partition. There are seven field-removable slot partition inserts,

one for each adjacent pair of service bays (slots 1-2, 3-4, 5-6, 9-10, 11-12, and 13-14). There is also a

separate removable slot partition for the two SRM service bays (slots 15-16) when full height SRM cards

are available. The back cards for all slots are single height, and the partition separators on the back of

the chassis are not removable.

VISM Modules

The Cisco MGX8850/VG VISM card provides standard T1 or E1 interfaces. Each Cisco MGX 8850

chassis supports up to 24 VISM modules, or 22 VISMs with 1:N redundancy. Each VISM card supports

8 T1/E1 connections providing for 4608 T1 DS0’s or 5952 E1 DS0’s. In the upper shelf there are six Cell

Buses that can be shared by 12 VISM cards (two cards each). Each Cell Bus runs at an OC-3 rate. The

two Cell Buses in the lower shelf also run at an OC-3 rate, but are shared among 6 slots each.

At one Erlang of traffic (fully loaded, all active) on all VISMs on the lower shelf, at G.711 10 msec with

no VAD, and for E1 cards (248 channels on each VISM), the lower Cell Bus capacity would not be

adequate to carry all traffic. These traffic assumptions are not realistic, so this limitation is not a concern.

Each VISM unit installed in a Cisco MGX 8850 consists of a front card and a back card (if not in bulk

mode). This two-card set provides interfaces to TDM T1/E1 lines through ports located on the back card.

Available T1 back cards are:

• RJ48-8T1-LM—supports eight T1 lines using RJ48 connectors.

• R-RJ48-8T1-LM—used with a T1 front card in redundant configurations.

The Cisco MGX8000/VG SRMSRM/C card is a high-density bulk distribution card that provides up to

3 T3s per card. The T1s are extracted and routed to the VISM cards via C-bit parity or M-frame format.

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Cisco OL-4015-08 Guide de dépannage Page 35

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