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Installation and Maintenance Manual Nimbra 300 Series
Product Overview
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4 x OC-3/STM-1 Trunk Module
The 4 x OC-3/STM-1 Trunk Module has four Small Form-factor Pluggable
(SFP) ports that can be fitted with opto-modules for different distances and
physical media. Short Range (SR1), Intermediate Range (IR1) and Long Range
(LR1/LR2) modules are available.
Each interface maps 288 64-bit slots into each SONET STS-3c SPE/SDH VC-4
according to the ETSI ES 201 803-4 specification. Each slot carries 512 kbps
payload resulting in a total payload of 147.456 Mbps. Out of this capacity 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 146.944 Mbps can be used for user payload, resulting in an
overhead less than 2%.
The front panel of the module is shown below.
Figure 5. Front panel 4 x OC-3/STM-1 Trunk Module
Status indicator LEDs provide information about the status of the port. Refer to
the Specifications chapter for more information about the indicators.
To insert, connect or replace the 4 x OC-3/STM-1 Trunk Module , refer to
chapter Hardware Maintenance.
SFP Transceiver for 4 x OC-3/STM-1 Trunk Module: Transceiver used for
duplex transmission of data in OC-3/STM-1, Data rate 155 Mbps. The Laser
module for the OC-3/STM1 Trunk Module are removable and can be changed
depending on the distance to the other units in the network. Please, see separate
description.