Table 35. E1/Ds3/E3 Coaxial Cabling Details; Table 36. Atm Device Cabling Distances - IBM 8265 Site Preparation Manual

Chapter 6. Planning for Coax Cable Connections
Cabling Distances
Setting the Earthing on DS3 and E3 Daughter Cards
© Copyright IBM Corp. 1994, 1998
This chapter describes how to plan for coax cable connections to the ATM system.
This section describes the coaxial cable for use with the E1, DS3, and E3 daughter
cards of the ATM WAN modules (A2-WAN and A8-WAN).
Table 35 details the accepted coaxial cables for the E1/DS3/E3 ATM ports.

Table 35. E1/DS3/E3 Coaxial Cabling Details

Daughter Card Type
E1
DS3
E3
Note: The 25 dB attenuation @ 400 MHz given corresponds to an attenuation of
12 dB @ 17 MHz, assuming that it follows approximately a
The values given in Table 36 are for information only, as the distance is dependent on
the quality of cable used.

Table 36. ATM Device Cabling Distances

Daughter Card Type
E1
DS3
E3
Note: If the DS3 cable distance exceeds the default (68m), the configuration setting
for the port must be changed using the SET PORT command. See the DS3
Line Buildout parameter in the Media Module Reference Guide.
To adhere to country-specific regulations regarding the earthing of outer conductors
on coaxial pairs (both receive and transmit ports), four jumpers are provided on the
rear of the DS3/E3 daughter cards. If the jumpers are not used, the outer connector is
earthed through a 10nF capacitor.
Normally, only the outer connector of the transmit port is to be earthed, and not the
receive port. This is dependent on individual country rulings. Check if your country
requires the receive port to be earthed as well.
Media Module Reference Guide to determine which jumpers are required
Refer to
the
to meet your requirements.
Cable Type Impedance
RG59
RG59
RG59
Cable Type
RG59 coax 300 m (984 ft)
RG59 coax 68 m (225 ft) default
135 m (450 ft) (see note)
RG59 coax 100 m (330 ft) based on a power budget
of 12 dB @ 17 MHz
Attenuation
75 ohm 6 dB Max
@ 1.024 MHz
75 ohm 25 dB Max / 100 m
@ 400 MHz
75 ohm 25 dB Max / 100 m
@ 400 MHz
law.
f
Maximum Proposed Distance
Part 0
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