Version 5.8 49 July 2009
Installation Manual 3. Installation
3.3.2.1 Connecting STM-1/OC-3 PSTN Interfaces
RTM-6310 provides two pairs of 155-Mbps optical small form-factor pluggable (SFP)
transceiver modules. The SFP pairs provide 1+1 redundancy scheme for STM-1/OC-3
PSTN interfaces. To interface with the SFP modules, you need to provide (i.e., not
supplied) the following items:
Cable: twin, single-mode fiber optic cable
Connector: LC-type plug
Caution Laser
Some blades contain a Class 1 LED/Laser emitting device, as defined by
21CFR 1040 and IEC825.
Do NOT stare directly into the beam or into fiber optic terminations as this can
damage your eyesight.
Care in Handling Fiber Optic Cabling:
1. When handling fiber optic cables, be sure to implement the following:
- Excessive bending of the Fiber Optic Cable can cause distortion and signal
losses.
- Ensure the minimum bending radius recommended by the Fiber Optic
Cable supplier.
- Maximum Fiber Optic cable length for multimode fiber is 550 m.
2. Incoming optic cabling from the network infrastructure can originate from the
top of the rack or from another shelf within the rack. Preserve the minimum-
bending ratio indicated by the cable manufacturer.
3. To ensure full high-availability capabilities, the configuration of the interface to
the IP backbone must include certain redundant features from which two
separate fiber optic cables are entering the device.
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