Cisco OSM-12CT3/T1 - Optical Services Module Multiplexor Guía de instalación Pagina 36
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Chapter 1 Product Overview
OSM Technology Overview
1-36
Cisco 7600 Series Internet Router Module Installation Guide
78-12798-07
SONET is not limited to optical links. Electrical specifications have been defined
for single-mode fiber, multimode fiber, and CATV 75-ohm coaxial cable. OSMs
currently allow transmission only over single-mode and multimode optical fiber.
Transmission rates are integral multiples of 51.840 Mbps, which can be used to
carry T3/E3 bit-synchronous signals.
The following transmission multiples are currently specified and commonly used:
• STS-3c—155.520 Mbps
• STS-12c—622.080 Mbps
• STS-48c—2,488.320 Mbps
ATM Overview
ATM uses cell-switching and multiplexing technology that combines the features
of circuit switching (constant transmission delay and guaranteed capacity) with
the features of packet switching (flexibility and efficiency for intermittent traffic).
ATM is a connection-oriented environment. All traffic to or from an ATM network
is prefaced with a virtual path identifier (VPI) and virtual channel identifier
(VCI). A VPI/VCI pair is considered a single virtual circuit. Each virtual circuit
is a private connection to another node on the ATM network. Each virtual circuit
is treated as a point-to-point mechanism to another router or host and is capable
of supporting bidirectional traffic.
Each ATM node is required to establish a separate connection to every other node
in the ATM network that it must communicate with. All of these connections are
established using a permanent virtual circuit (PVC), which a network operator
configures, or an switched virtual circuit (SVC), which is set up and torn down
with an ATM signaling mechanism. This signaling is based on the ATM Forum
User-Network Interface (UNI) Specification V3.x, 4.0.
SONET
1
1. ANSI-defined SONET specifications
SDH Equivalent
STS-3c STM-1
STS-12c STM-4c
STS-48c STM-16c
- Product Overview 1
- Supported Hardware 2
- Features 3
- Supervisor Engines 6
- Table 1-2 Supervisor Engines 7
- SUPERVISOR2 8
- WS-X6K-SUP2-2GE 8
- Reset Button 11
- Console Port 11
- Console Port Mode Switch 12
- Switch Load Meter 13
- PCMCIA Slot 13
- Uplink Ports 13
- Optical Services Modules 14
- OC-12c POS 15
- OC-48 POS 16
- OC-48 DPT/POS 17
- Channelized OC-12 17
- OC-12 ATM 18
- 2+4-Port Gigabit Ethernet WAN 19
- 12-Port Channelized T-3 20
- OSMLED Descriptions 20
- OSM STATUS LED 21
- Environmental 22
- ALARM 24
- Catalyst 6000 Family Modules 25
- FlexWAN Module (WS-X6182-2PA) 26
- WS-X6516-GBIC 27
- SWITCH FABRIC MDL 28
- 78-12798-07 30
- Port Addresses 31
- Physical Interface Addresses 32
- MAC Addresses 33
- OSM Technology Overview 35
- ATM Overview 36
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