Installation guide

3-33
Cisco IGX 8400 Series Installation Guide, Release 9.3.3 and Later Releases
OL-1165-06
Chapter 3 Installing the IGX
Making Serial Data Connections
Making Serial Data Connections
The low-speed data module (LDM) and high-speed data module (HDM) card sets provide serial data
service. Each of these front cards uses a variety of back cards.
The LDM front card uses the 4- or 8-port version of the low-speed data interface (LDI) back card for
EIA/TIA-232C/D (V.24) connections. The connection ports are labeled Port 1 through Port 4 or Port 1
through Port 8. See Figure 3-12 for illustrations of these back cards. For instructions on configuring a
port on the LDI back card for data terminal equipment (DTE) or data circuit-terminating equipment
(DCE) mode, refer to the “Configuring the Mode of an LDI Port” section on page 3-35.
The HDM front card works with four types of serial data interface (SDI) back cards. Available SDIs are
V.35, EIA/TIA-449/422, EIA/TIA-232D, and EIA/TIA-232C (V.24). (X.21 uses EIA/TIA-449 plus an
adapter cable.) Each type of SDI has four connection ports, which are labeled Port 1 through Port 4. A
sample SDI card appears in Figure 3-12.
When you connect an HDM or LDM port, use the shortest reasonable cable length for each port.
Figure 3-12 SDI and LDI Faceplates
LDI
xxxxxx
xxxx xxx
xxxxxx
xxx xxxx
x xx
xx xx xx
LDI
xxxxxx
xxxx xxx
xxxxxx
xxx xxxx
x xx
xx xx xx
Port 1
Port 2
Port 3
Port 4
Port 1
Port 3
Port 5
Port 6
Port 2
Port 4
Port 7
Port 8
SDI
xxxxxx
xxxx xxx
xxxxxx
xxx xxxx
x xx
xx xx xx
LDI 4 Port LDI 8 Port SDI
(
V.35 shown
)
H8355