Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 2 Cisco IGX 8400 Series Cards
Low-Speed Data Module
Redundancy for LDM data card types is available through a second front and back card set and a Y-cable
connection on each port to the customer data equipment. For more information on Y-cable redundancy,
see the “Card Redundancy” section on page 2-15.
The 4- and 8-port LDM supports only a subset of the full EIA/TIA-232C/D control leads. The LDM
supports only nonisochronous DCE normal and DTE looped clocking modes, transmission of 3 EIA lead
states (non-interleaved), and baud rates of up to 19.2 kbps on the 8-port version and 56 kbps on the
4-port version. Split clock mode is not supported.
Low-Speed Data Interface Back Card
The low-speed data interface (LDI) back card is a low-speed data interface back card that operates in
conjunction with an LDM front card. The LDI back card provides the physical and electrical connection
interface between the user low-speed data circuit and the LDM data PAD. There are two LDI
models—one 4-port and one 8-port (see Table 2-50).
The LDI back card has the following features:
• Four or eight ports for interfacing to the data equipment
• Sampling of EIA lead status for the LDM to monitor
• Serial-to-parallel conversion of user data
• Support for DTE or DCE operation
The LDI back card can operate either as a DCE or DTE. Selection is made by using a Cisco DTE or DCE
adapter cable between the port connector and the cable from the user device. This cable is terminated
with a standard DB-25 on the customer end. Each port is configured separately.
Three EIA control leads are brought out to the rear connectors (see Table 2-51).
Fail LED (red) An error has occurred.
Active LED (green) The card is active and functioning normally.
Table 2-49 LDM Front Card Connections and LEDs (continued)
Faceplate Item Function
Table 2-50 LDI Physical Interfaces
Card Interface Ports Connector
LDI 4 EIA/TIA-232C/D (V.24) 4 ports DB-15 subminiature, female
LDI 8 EIA/TIA-232C/D (V.24) 8 ports DB-15 subminiature, female
Table 2-51 EIA Control Leads
Leads for DCE Leads for DTE
RTS CTS
DSR DTR
DCD RL