Table Of Contents
VWIC-2MFT-T1-DIR, VWIC-2MFT-E1-DIR Installation Instructions
This document contains the following sections:
The Cisco VWIC-2MFT-T1-DIR and VWIC-2MFT-E1-DIR Voice/WAN Interface Cards support data applications on the Cisco MWR 1941-DC Mobile Wireless Edge Router for T1/E1 networks. These cards are dual-port, T1/Fractional T1 or E1/Fractional E1, Drop and Insert Multiplexers with integrated T1 CSU/DSUs or E1 DSUs. The T1 version supports framed and unframed traffic, and the E1 version supports framed traffic and unframed traffic that conforms to the ITU-T G.703 standard for full 2.048 Mbps bandwidth.
The Drop and Insert multiplexer diverts (drops) streams of an aggregate Time Division Multiplexed (TDM) traffic stream, and introduces (inserts) different streams for transmission in the time slots that were previously occupied by the dropped streams. Each VWIC supports a limited channelized capability where the T1 or E1 can be flexibly split into two fractional channel groups, one on each port or two on one port. The switching operation can be maintained through router restarts and reloads of Cisco IOS software.
Each card also features protection switch solid state relays on the line interfaces, which together with redundancy logic and relay control added in a Cisco IOS feature set on the MWR 1941-DC router, can be used to provide T1/E1 Protection Switching between redundant routers in applicable implementations.
Note For information on the Cisco MWR 1941-DC router implementations and Cisco IOS software available for those implementations, see the Cisco MWR 1941-DC Mobile Wireless Edge Router Software Configuration Guide.
The Cisco MWR 1941-DC router provides three WAN interface slots, which allows support for 6 T1/E1s.
Physical Characteristics of the VWIC-2MFT-T1-DIR, VWIC-2MFT-E1-DIR
Figure 1 2-Port T1 Multiflex Trunk Interface Card with Drop and Insert and Relays (VWIC-2MFT-T1-DIR) Front Panel
Figure 2 2-Port E1 Multiflex Trunk Interface Card with Drop and Insert and Relays (VWIC-2MFT-E1-DIR) Front Panel
Note The labeling under the port and on the lower left of the card indicates whether it is a T1 or E1 card. Also, due to limited space, the last dash was omitted from the label on the card (VWIC-2MFT-E1DIR and VWIC-2MFT-T1DIR).
This section provides safety guidelines that you should follow when working with any equipment that connects to electrical power or telephone wiring.
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, might harm you. A warning symbol precedes each warning statement.
Electrical Equipment Guidelines
Follow these basic guidelines when working with any electrical equipment:
•Before beginning any procedures requiring access to the chassis interior, locate the emergency power-off switch for the room in which you are working.
•Disconnect all power and external cables before moving a chassis.
•Do not work alone when potentially hazardous conditions exist.
•Never assume that power has been disconnected from a circuit; always check.
•Do not perform any action that creates a potential hazard to people or makes the equipment unsafe; carefully examine your work area for possible hazards such as moist floors, ungrounded power extension cables, and missing safety grounds.
Telephone Wiring Guidelines
Use the following guidelines when working with any equipment that is connected to telephone wiring or to other network cabling:
•Never install telephone wiring during a lightning storm.
•Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
•Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.
•Use caution when installing or modifying telephone lines.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, which can occur when electronic cards or components are improperly handled, results in complete or intermittent failures. Port adapters and processor modules comprise printed circuit boards that are fixed in metal carriers. Electromagnetic interference (EMI) shielding and connectors are integral components of the carrier. Although the metal carrier helps to protect the board from ESD, use a preventive antistatic strap during handling.
Following are guidelines for preventing ESD damage:
•Always use an ESD wrist or ankle strap and ensure that it makes good skin contact.
•Connect the equipment end of the strap to an unfinished chassis surface.
•When installing a component, use any available ejector levers or captive installation screws to properly seat the bus connectors in the backplane or midplane. These devices prevent accidental removal, provide proper grounding for the system, and help to ensure that bus connectors are properly seated.
•When removing a component, use any available ejector levers or captive installation screws to release the bus connectors from the backplane or midplane.
•Handle carriers by available handles or edges only; avoid touching the printed circuit boards or connectors.
•Place a removed board component-side-up on an antistatic surface or in a static shielding container. If you plan to return the component to the factory, immediately place it in a static shielding container.
•Avoid contact between the printed circuit boards and clothing. The wrist strap only protects components from ESD voltages on the body; ESD voltages on clothing can still cause damage.
•Never attempt to remove the printed circuit board from the metal carrier.
Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohms (Mohms).
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case users will be required to correct the interference at their own expense.
You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference by using one or more of the following measures:
•Turn the television or radio antenna until the interference stops.
•Move the equipment to one side or the other of the television or radio.
•Move the equipment farther away from the television or radio.
•Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is, make certain the equipment and the television or radio are on circuits controlled by different circuit breakers or fuses.)
Installing the VWIC-2MFT-T1-DIR, VWIC-2MFT-E1-DIR
In addition to the T1/E1 Multiflex VWIC and the Cisco MWR 1941-DC router, you need the following items to install and connect your card:
•Number 2 Phillips screwdriver
•ESD-preventive wrist strap
•Appropriate connecting cable
You can install T1/E1 Multiflex VWICs either before or after mounting the router, whichever is more convenient.
Caution T1/E1 Multiflex VWICs do not support online insertion and removal (hot swapping). Before inserting a card into the network module or router chassis, you must turn off electrical power and disconnect network cables.
To install a T1/E1 Multiflex VWIC, follow this procedure:
Step 1 Power off the router by turning OFF the DC power source at the circuit breaker and taping the circuit breaker into the OFF position. To channel ESD voltages to the ground, do not remove the wire from the ground lug.
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position.
Step 2 Remove all network interface cables, including telephone cables, from the front panel.
Step 3 Use either a number 2 Phillips screwdriver or a small flat-blade screwdriver to remove the blank filler panel from the network module slot where you plan to install the card. Save the filler panel for future use.
Step 4 Align the card with the guides in the two-slot network module and slide it gently into the slot.
Step 5 Push the card into place until you feel its edge connector mate securely with the connector.
Step 6 Fasten the card's captive mounting screws into the holes in the network module faceplate using the Phillips or flat-blade screwdriver.
Step 7 If the router was previously running, reinstall the network interface cables and turn on power to the router.
Warning After wiring the DC power supply, remove the tape from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the ON position.
Connecting the T1/E1 Multiflex VWIC Card
How you connect the ports of the T1/E1 Multiflex VWIC depends on whether you are using the Cisco MWR 1941-DC router in a redundant or a non-redundant configuration.
Whether you are using the Cisco MWR 1941-DC router in a redundant or non-redundant configuration depends on the implementation of the router. For information on MWR 1941-DC router implementations, see the Cisco MWR 1941-DC Mobile Wireless Edge Router Software Configuration Guide.
For redundant configurations, use a Y-cable (as described in Y-Cable Specifications).
Note HSRP must be configured for redundancy to allow one router to become active (CD LED on) and the other to become the standby (AL LED on due to no framing).
Step 1 Confirm that both routers are turned off.
Step 2 Connect the end of one of the Y-cable stubs to the T1 or E1 port on the card on the first router.
Step 3 Connect the end of the other Y-cable stub to the T1 or E1 port (using the same type of port as in Step 2) on the card in the second router.
Step 4 Connect the other end of the Y-cable to the BTS patch or demarcation panel at your site.
Step 5 Turn on power to the routers.
Step 6 Check that the CD LEDs goes on, which means that the card's internal DSU/CSU is communicating with the DSU/CSU at the T1 or E1 service provider central office.
For non-redundant configurations, use a straight-through, shielded RJ-48C-to-RJ-48C cable.
Note If you choose to use the T1/E1 Multiflex VWIC in a non-redundant configuration, you must close the relays on the card using the standalone subcommand. For more information, see the "Cisco MWR 1941-DC Mobile Wireless Edge Router Software Configuration Guide."
Step 1 Confirm that the router is turned off.
Step 2 Connect one end of the cable to the T1 or E1 port on the card.
Step 3 Connect the other end to the BTS patch or demarcation panel at your site.
Step 4 Turn on power to the router.
Step 5 Check that the CD LED goes on, which means that the card's internal DSU/CSU is communicating with the DSU/CSU at the T1 or E1 service provider central office.
Configuring the VWIC-2MFT-T1-DIR, VWIC-2MFT-E1-DIR
For information about configuring the T1/E1 Multiflex VWICs, see the "Cisco MWR 1941-DC Mobile Wireless Edge Router Software Configuration Guide."
Depending on the Cisco MWR 1941-DC router implementation, the T1/E1 Multiflex VWIC can be used in a standalone router or in redundant Cisco MWR 1941-DC router configurations. For redundant configurations, a special Y-cable is required to connect the active and standby routers. The Y-cable provides a dual E1 or T1 PRI connection.
This section describes the specifications of the Y-cable.
•T1/E1 Multiflex VWIC Y-cables should be made with 4 twisted-pair, shielded, 28-gauge cables.
•The cable length of each stub (from the RJ-48C connector to the junction point) should not exceed 3 inches (76 mm).
•The cable length from junction point to the patch panel is determined by the customer.
•All signals that propagate in the same direction must share the same twisted pair. For example, RX TIP and RX RING must form a single twisted pair.
•All unused twisted pairs should be cut flush on both ends of the cable. Any unused wire in a twisted pair where one wire is in use should be cut flush at both ends.
RJ-48C Pinout Configuration
The T1/E1 Multiflex VWIC uses an RJ-48C connection, as shown in Figure 3.
Figure 3 RJ-48C Connection
Table 1 shows the pinout configuration of the RJ-48C connectors on the T1/E1 Multiflex VWIC.
Table 1 RJ-48C Pinout
Understanding the LEDs
The T1/E1 Multiflex VWIC has six LEDs (three for each port) as listed in Table 2.
Translated Safety Warnings
This section contains translated versions of all the safety warnings contained in this document.
DC Power Disconnection Warning
DC Power Connection Warning
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