Chapter 7: Protection Schemes; Introduction To Protection; General Protection Information And Architecture Rules; Oms 1240 Protection Rules - Ericsson Marconi OMS 1200 Product Description

Chapter 7:
Protection Schemes
7.1

Introduction to Protection

Equipment protection and network protection is used to prevent traffic errors due to
single points of failure.
This chapter describes the behaviour of the protection schemes implemented in the
OMS 1200 equipment.
The protection schemes supported by the OMS 1240 and the OMS 1260 are shown in
Table 7-1:
1 + 1 MSP
SNCP.
MS-SPRING*
Switch Protection
1:N Card Protection (PDH & STM-1 Elec.).
PDH Port Protection.
* MS-SPRING only available with STM4/16 Core cards
7.2

General Protection Information and Architecture Rules

The same protection schemes apply in OMS 1200 family equipment, but because of
the increased size of the OMS 1260 rack and available bandwidth slots, the position of
the protection cards must be located as described.
7.2.1

OMS 1240 Protection Rules

7.2.1.1 Core and Core Tributary Protection
The OMS 1240 provides two slots for Core cards, designated A and B, and two slots
for 2Mb/s Core Tributary cards, also designated A and B. Unprotected systems use
the "A" slots only - the "B" slots are used for protection.
Core cards are fitted in slots S1_03 (Protection Traffic Core B) and S1_04 (Traffic
Core A/CCU).
The 2M core tributary associated with Core A/CCU is fitted to Slot S1_06 (Core
Tributary A). The 2M core tributary associated with Traffic Core B is fitted to Slot
S1_05 (Core Tributary B).
The equipping rules for these four slots are inter-dependent, and are defined in Table
7-2.
221 02-ZAP 701 25/1 Rev C 2006-08-04
03PHB00004AAV-CUA

Table 7-1: Protection Mechanisms

Protection scheme
Marconi OMS 1200
Technical Product Description
OMS 1240 OMS 1260
✔ ✔
✔ ✔
✔ ✔
✔ ✔
✔ ✔
✔ ✔
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