001-01-000055 Rev. 000
Page 2 of 7
TWISTED PAIR
CAT5 / CAT6
Network
Equipment
Customer
A
Customer
B
Customer
C
FIBER
Customer
D
COAX
T1
DS3
Ethernet
Fiber
SIPP
Service
Interface
+
Primary
Protection
+
High-Speed
Current Limiter
BUILDING, HUT, OR CABINET
Figure 2. SIPP application
The versatility of the SIPP makes it suitable for any
combination of Ethernet, T1/E1, DS3, or fiber services in
central offices, CEVs, or outside plant cabinets.
Orderable options allow for front-only or front and rear
access to connectors.
NOTE: For dry-loop service only (no DC voltage).
3. DESCRIPTION
The base SIPP-600 model is a 6-slot chassis, 1RU high,
with adjustable brackets for a variety of wall mount
configurations. The chassis is constructed of heavy-
gauge stainless steel and accommodates up to six plug-
in modules, as described below. Model SIPP-600C
includes a removable cable cover to prevent tampering
with front-side network equipment connections.
Plug-in Modules
Service Protection Modules (SPM) connect to copper
facilities to protect Ethernet, DS3, or T1/E1 network
equipment against lightning surges and AC power faults.
Modules are available with front-only or front and rear
connectors, and optional monitor jacks. Each SPM
occupies one or two slots in a SIPP chassis, depending
on the chosen jack configuration.
Figure 3. Example Service Protection Modules
Fiber services or copper services that do not require
protection can be connected through a Modular Interface
Panel (MIP), shown in Figure 4. The MIP module
occupies four slots in a SIPP chassis and provides four
Keystone slots for snap-in couplers that connect network
equipment to facilities.
Please refer to the Ordering Guide at the end of this
document for a list of plug-in modules and their
descriptions.
Figure 4. MIP with SC fiber couplers installed
Coordinated Protection
The Service Protection Modules combine current limiting,
voltage limiting (gas discharge tube), and fusing to
prevent lightning and AC surges from damaging network
equipment. Figure 5 shows the placement of these
protection elements within the SPM.
EXPOSED
FACILITY
HIGH-SPEED
CURRENT
LIMITER
SURGE ENERGY
NETWORK
EQUIPMENT
SPM
GAS
DISCHARGE
TUBE
SURGE
TOLERANT
FUSE
Figure 5. SPM block diagram
The fast-reacting current limiter blocks transients by
switching to a high resistance state, at which point the
gas tube diverts surge energy to ground. The
combination of current and voltage limiting blocks more
energy than can be achieved by voltage clamping alone.
Within one microsecond, the current let through toward
network equipment is reduced to less than 1 mA (0.1V
into a 100
Ω
load). After the surge clears, the current
limiter returns to a low series resistance and the gas tube
returns to high bridging resistance.
Fail Safe Operation
Fusing within the SPM provides an alternative to
installation of external fuse links. In the event of an
extreme lightning surge or high AC exposure, SPM fuses
opens to prevent hazardous damage to connectors or
cabling. The fuses are surge tolerant and remain
transparent to moderate strikes.
In addition, all SPM gas tubes include a fail-short
mechanism that prevents thermal overload under AC
conditions. The feature creates a mechanical short to
ground and only operates if prolonged AC energy exists
that could otherwise create a fire hazard.
Activation of a fuse or fail-short mechanism requires the
SPM to be replaced.
