Preparing for Installation 2-43
Preparing Network Connections
Figure 2-37 X.21 Adapter Cable Connectors, Network End
EIA-530 Connections
EIA-530, which supports balanced transmission, provides the increased functionality, speed, and
distance of EIA/TIA-449 on the smaller, DB-25 connector used for EIA/TIA-232. The EIA-530
standard was created to support the more sophisticated circuitry of EIA/TIA-449 on the masses of
existing EIA/TIA-232 (DB-25) hardware instead of the larger, 37-pin connectors used for
EIA/TIA-449. Like EIA/TIA-449, EIA-530 refers to the electrical specifications of EIA/TIA-422
and EIA/TIA-423. Although the specification recommends a maximum speed of 2 Mbps, EIA-530
is used successfully at 4 Mbps and at even faster speeds over short distances; however, do so at your
own risk. We do not recommend exceeding the published speed and distance specifications. EIA-530
is used primarily in the United States.
The EIA-530 adapter cable is available in DTE mode only. The router (FSIP) end of the EIA-530
adapter cable is a high-density 60-pin plug. The opposite (network) end of the adapter cable is a
standard DB-25 plug commonly used for EIA/TIA-232 connections. Figure 2-38 shows the DB-25
connector at the network end of the adapter cable.
Figure 2-38 EIA-530 Adapter Cable Connector, Network End (Available in DTE Only)
M3 Metric Thumbscrew Replacements
A pair of metric thumbscrews is included with each port adapter cable except V.35. If you will
connect serial cables to remote devices that use metric hardware, replace the standard 4-40
thumbscrews at the network end of those cables with the M3 thumbscrews. Refer to “Connecting to
Metric-Based Devices” in the chapter “Installing the Router” for replacement instructions.
HSSI Connection Equipment
You will need an T3, E3, or SONET STS-1 DSU and HSSI interface cable to connect the HIP with
the external network. The HIP HSSI interface port is a 50-pin SCSI-II-type receptacle. The HSSI
interface cable comprises 25 twisted pairs and a 50-pin plug at each end; Figure 2-39 shows the
connector that is at both ends of the cable. Although the HSSI cable is similar to a SCSI-II cable, it
is not identical; you cannot substitute a SCSI-II cable for a HSSI interface cable. (See the following
Caution.)
1
8
15
9
DCE
DTE
H1346a
DTE
H1615a
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