Installation guide

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Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 3 Installing the IGX
Making Frame Relay Connections
Setting Up Frame Relay on an FRM
Four types of interfaces are available for the FRM. The back cards have the following terminations:
• The FRI-T1 has a female, subminiature DB-15.
• The FRI-E1 has a single 120-ohm, DB-15 connector for a balanced termination and two, 75-ohm
BNC connectors for coaxial cables for an unbalanced termination. All connectors are female.
• FRI-V.35 has standard 34-pin female MRAC type connectors with a standard V.35 cable.
• FRI-X.21 has female DB-15 subminiature connectors.
Cabling requirements for the Frame Relay interfaces are in the “FRI V.35 Port Pin Assignments” section
on page A-39.
Take the following steps after you have inserted the cards according to the general information on
installing cards in the “Preparing the Cards” section on page 3-1. To connect a cable:
Step 1 Bring each cable through the opening at the top or bottom of the cabinet (whichever applies) and along
the back of the unit.
Step 2 If needed, use the cable manager to help route the cables.
Step 3 Secure the cables to the connectors on the cards that mate with the correct front card.
Step 4 Record the slot number of each line. These numbers are necessary for configuring the system.
Port Mode Selection for V.35 and X.21
The position of a small jumper board at each port determines whether it is a DCE or a DTE.
Caution To prevent damage to the FRI cards, ground yourself before handling IGX cards by clipping a grounding
strap to your wrist, and clipping the wrist strap lead to the enclosure.
A small jumper card near each connector on the back card selects the port’s mode. The factory-set modes
alternate between DCE and DTE. The steps that follow describe how to change the mode of a port. The
relation between back card row numbers and the port mode is as follows:
• DCE=1, 2, 4, and 5 (jumper card is closest to the FRI faceplate)
• DTE=2, 3, 5, and 6 (jumper card is one row away from the FRI faceplate)
Note Jumper cards for selecting the mode of a V.35 or X.21 interface have an impedance of either
100 ohms or 200 ohms. At higher speeds on ports with Y-cable redundancy, the impedance is important.
With Y-cable redundancy on a higher-speed connection, use the 200-ohm jumper card. Without Y-cable
redundancy or when the port speed is low, the 100-ohm jumper card is adequate.
Note Carefully choose the mode for each port. If you change a port mode after other ports on the card are
carrying traffic, it disrupts service on the other ports.