DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Hardware Configurations
2-8PNC Cabling — Fiber Hardware
2
PNC Cabling — Fiber Hardware
The term “fiber” is used to refer to all the hardware needed for the th ree basic
types of connections used to form multi-PN systems. Fiber administration
specifies the endp oints to be connect ed, optional DS1 CONV locations, and
parameters for DS1 Facility Line encoding and equalization. The 3 connec tion
types are:
1. EI-to-EI or EI-to-SNI Intercabinet hardware
2. EI-to-SNI or EI-to-EI intracabinet hardware
3. EI-DS1CONV or SNI-DS1CONV hardware

EI-to-EI or EI-to-SNI Intercabinet Fiber Optic

Cables

EI-to-EI or EI-to-SNI intercabinet connections are implemented by installing a
lightwave transceiver on the I/O c onnector plate for each of the administered
fiber endpoints. Each lig htwave transceiver has a receive and a transmit
connector for a 62.5 micron or 50 m icron fiber connec tion. Standard fibers are
available in various lengths up to 150 feet (46 m) for single-mode fiber and up to
200 feet (61 m) for multi-mode fiber. These fib ers are used to connect lig htwave
transceivers to each other when they are c lose enough together, or to op tical
cross-connect fac ilities for greater distances.
The lightwave transceivers are powered from I/O connector plate lead s attached
to TN570 Expansion Interface circuit p ack or a TN573 Switch Node Interfac e
circuit pack. The transceivers include loop -around capab ilities to support fib er
fault isolation. Either of two different 9823-type multi-mod e transceivers may be
used, depend ing upon the length of the fib er (table below), or the 300A s ingle
mode fiber transceiver. The transc eivers at each end of a g iven fiber should
match. Figure 2-2 illustrates the interconnec tion of fiber optic hardware.
Part
Number Maximum Fiber Length Fiber Mode
9823A 4900 feet (1494 m) Multi-mode
9823B 25,000 feet (7620 m) Multi-mode
300A 22 miles (35.4 km) Single mode