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Researching the requirements 33
CabHng
This section identifies the various cabling used in the SL-1 system and
provides some guidelines for cabling. Equipment placement in relation to
cable lengths should be considered and planned for. Depending on your
system and future expansion (of PE modules, for example), the cables you
choose must be the right length.
Cable types
All cables must be designated (tagged) at both ends. The SL-1 uses at least
five types of wiring:
-
Twisted-Pair Telephone Cables
-
25-Pair MDF Cables
-
Twisted-Pair Shielded and Non-Shielded Cables
-
Interface (I/O) Cables
-
Power and Ground Cables
Twisted-pair telephone cables
These cables carry analog voice and digitized voice/data information
between distribution frames and devices located throughout the office.
They run from cross-connect panels to jacks (8-pin modular) located within
8
feet (2.4 m) of each peripheral device.
2L,Pair MDF cables
These cables carry voice and data information between the SL-1
UEMs
and
the distribution frame. When the cables are run from the UEM to the
distribution frame, one end of the cable must be equipped with a 25-pair
female connector which terminates on the cabinet I/O panel.
Twisted-pair shielded cables
These cables are used to interconnect the trip power monitoring connections
between power interface units and the main distributing frame. Typically, a
16 AWG, stranded (Belden type 8408-2 conductor or equivalent) type
shielded cable is used for trip connections. All other connections are
serviced by non-shielded, 16 AWG stranded cable.
Installation planning 553-3001-l 20