![Nimbra 300 Series Скачать руководство пользователя страница 18](http://html.mh-extra.com/html/nimbra/300-series/300-series_installation-and-maintenance-manual_1694310018.webp)
16
•
Contents
Installation and Maintenance Manual Nimbra 300 Series
©2006 Net Insight AB, All rights reserved
OC-12/STM-4 Trunk Module
The OC-12/STM-4 Trunk Module has a Small Form-factor Pluggable (SFP) port
that can be fitted with opto-modules for different distances and physical media.
Intermediate Range (IR1), and Long Range (LR1/LR2) modules are available.
The module maps 1152 64-bit slots into each SONET STS-12c SPE/SDH VC-4-
4c according to the ETSI ES 201 803-4 specification. Each slot carries 512 kbps
payload resulting in a total payload of 589.824 Mbps. Out of this capacity
typically one slot is used for internal signaling and 0 - X slots for management
purposes, where X depends on the configuration of the in-band management
network. This means that up to 589.312 Mbps can be used for user payload,
resulting in an overhead less than 2%.
The front panel of the module is shown below.
Figure 6. Front panel OC-12/STM-4 Trunk Module
In normal operation the Power LED is lit and the Remove indicator LED is off.
A Request removal button is used when the Module should be replaced (see
chapter Hardware Maintenance). Status indicator LEDs provide information
about the status of the respective ports. Refer to chapter Specifications for
information about these indicators.
To insert, disconnect or replace a trunk module, refer to chapter Hardware
Maintenance.
SFP Transceiver for OC-12/STM-4 Module: The transceiver modules for the
OC-12/STM-4 Module are removable and can be changed depending on the
distance to the other units in the network. They are separately described.