Emerson Network Power.
The global leader in enabling business-
critical continuity.
• AC Power Systems
• Connectivity
• DC Power Systems
• Embedded Computing
Embedded Power
• Integrated Cabinet Solutions
• Outside Plant
• Power Switching & Control
• Precision Cooling
• Services
• Site Monitoring
• Surge Protection
Outside Plant for
Business-Critical Continuity
1
Description
The R305 is a 100-pair high-density connector used on central office main distributing
frames. Its compact design, only 8.5-in. high, allows maximum density per frame vertical.
The connector accepts industry standard 5-pin protector modules.
The R305 can be factory stubbed with 22 or 24-gauge cable in 10-ft. increments, starting
at 20 feet. The stub is complete with a moisture dam and grounding harness. The connec-
tor has a 6AWG grounding system and is available with or without isolated ground.
The equipment field pins are located on the right side, and are angled forward for conve-
nient terminating. The equipment field dust cover swings out of the way for wiring, and
prevents personnel from coming in contact with the wiring field when pulling modules
from an adjacent connector. A fanning strip to organize jumper wires is located at the rear
edge of the equipment field. The front-facing test fields make field testing easy.
Application
The R305 protects personnel and equipment from abnormal voltages and currents on
incoming cable pairs. It is ideal for use in central offices. The R305 is used on conventional
distribution frames with 8-in. centers.
Plug-in modules ordered separately.
R305
R305
Central Office Connector
Key Features
• Maximum density saves space;
increases number of protected
cable pairs per frame vertical
• Angled equipment field pins
provide convenient termination
• Equipment field cover protects
personnel from injury and pins
from damage and/or electrical
shorts
• Accepts industry standard
protector modules to permit a
wide module selection
• Standard 50-pair 303-type test
fields save costs; require no
special test gear; are compatible
with other connectors for frame
expansion
• Gold-plated protector module
sockets and test-field contacts
provide superior electrical contact;
eliminate noise problems
OSPDS-092100 / 0106
2
Dimensions
Connector H W D
R305 8.43-in. (214mm) 4.30-in. (109mm) 8.00-in. (203mm)
Specifications
Frame Capacity Capacity
Height (Stub Up)* (Stub Down)
7-ft. 700 pair 800 pair
8-ft. 900 pair 1000 pair
9-ft. 1000 pair 1100 pair
11.5-ft. 1400 pair 1400 pair
Ordering Matrix
Ground Configuration blank = Conventional ground
S = Isolated ground
Connector Application R305 = Standard ground
Stub Cable Gauge A = 24-gauge, .96 dia. o.d.
B = 22-gauge, 1.17 dia. o.d.
Stub Cable Type A = Alvyn
T = Two 22AWG cables**
Stub Length in Feet (20-ft. minimum in 10-ft. increments)
Stub Direction U = Up
D = Down
** T configuration provides an equivalent to T screen-type cable. Two 50-pair cables are secured together every three feet.
NOTE 1: Not all catalog numbers can be configured.
NOTE 2: To order a stubless connector use Catalog Number R305 (Part Number F251000).
NOTE 3: Order one temporary bracket per installation when field stubbing (Catalog Number P33779, Part Number F533779).
NOTE 4: See the Protection section for protector modules, the Accessories section for test equipment accessories,
and the CO & Remote Frames Systems section for mounting bars.
* Reduction in stub up capacity is due to accommodating cable bend to overhead rack.
R305 Swing-Out Cover
(shown in open position on connector)
F522385 replacement cover
OSPDS-092100 / 0106
R305 Central Office Connector
3
Ordering Information: Stubbless Connectors
Catalog Part
Number Number Description
R305 F251000 Wire-wrap version
SR305 F251599 Isolated ground wire-wrap version
OSPDS-092100 / 0106
R305 Central Office Connector
Ordering Information: Stubbed Connectors — 24 AWG
Catalog Part
Number Number Description
Wire-Wrap Equipment Field
R305AA25U F251008 Connector, wire-wrap equipment field, 25-ft. stub up
R305AA25D F251007 Connector, wire-wrap equipment field, 25-ft. stub down
R305AA50U F251038 Connector, wire-wrap equipment field, 50-ft. stub up
R305AA50D F251037 Connector, wire-wrap equipment field, 50-ft. stub down
R305AA75U F251068 Connector, wire-wrap equipment field, 75-ft. stub up
R305AA75D F251067 Connector, wire-wrap equipment field, 75-ft. stub down
R305AA100U F251095 Connector, wire-wrap equipment field, 100-ft. stub up
R305AA100D F251096 Connector, wire-wrap equipment field, 100-ft. stub down
Isolated Ground, Wire-Wrap Equipment Field
SR305AA30U F251606 Connector, wire-wrap equipment field, 30-ft. stub up
SR305AA30D F251604 Connector, wire-wrap equipment field, 30-ft. stub down
SR305AA50U F251630 Connector, wire-wrap equipment field, 50-ft. stub up
SR305AA50D F251613 Connector, wire-wrap equipment field, 50-ft. stub down
SR305AA60U F251629 Connector, wire-wrap equipment field, 60-ft. stub up
SR305AA75D F251036 Connector, wire-wrap equipment field, 75-ft. stub down
SR305AA100D F251690 Connector, wire-wrap equipment field, 100-ft. stub down
SR305AA100U F251691 Connector, wire-wrap equipment field, 100-ft. stub up
© 2006 Emerson Network Power Energy Systems,
North America, Inc. All rights reserved.
The Emerson logo is a trademark and a service mark
of Emerson Electric Co. Emerson Network Power is a division
of Emerson Electric Co.
Printed in USA
Emerson Network Power
Energy Systems
4350 Weaver Parkway, Warrenville, IL 60555
Toll Free: 800-800-1280 (USA and Canada)
Telephone: 440-246-6999 Fax: 440-246-4876
www.EmersonNetworkPower.com/EnergySystems
4
Emerson Network Power.
The global leader in enabling business-
critical continuity.
• AC Power Systems
• Connectivity
• DC Power Systems
• Embedded Computing
Embedded Power
• Integrated Cabinet Solutions
• Outside Plant
• Power Switching & Control
• Precision Cooling
• Services
• Site Monitoring
• Surge Protection
Ordering Information: Stubbed Connectors — 22 AWG
Catalog Part
Number Number Description
Wire-Wrap Equipment Field
R305BA20U F251004 Connector, wire-wrap equipment field, 20-ft. stub up
R305BA20D F251003 Connector, wire-wrap equipment field, 20-ft. stub down
R305BA50U F251040 Connector, wire-wrap equipment field, 50-ft. stub up
R305BA50D F251039 Connector, wire-wrap equipment field, 50-ft. stub down
R305BA75U F251070 Connector, wire-wrap equipment field, 75-ft. stub up
R305BA75D F251069 Connector, wire-wrap equipment field, 75-ft. stub down
Isolated Ground, Wire-Wrap Equipment Field
SR305BA20U F251603 Connector, wire-wrap equipment field, 20-ft. stub up
SR305BA20D F251615 Connector, wire-wrap equipment field, 20-ft. stub down
SR305BA50U F251620 Connector, wire-wrap equipment field, 50-ft. stub up
SR305BA50D F251618 Connector, wire-wrap equipment field, 50-ft. stub down
SR305BA60U F251621 Connector, wire-wrap equipment field, 60-ft. stub up
SR305BA80D F251625 Connector, wire-wrap equipment field, 80-ft. stub down
Accessories
Catalog Part
Number Number Description
P22385 F522385 R305 replacement cover
1161 F013791 14-in. single pair tester w/ gold-plated pins
OSPDS-092100 / 0106
R305 Central Office Connector
