© Copyright IBM Corp. 1994, 1998
53
Part 0
Chapter 6. Planning for Coax Cable Connections
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.
Note:
The 25 dB attenuation @ 400 MHz given corresponds to an attenuation of
12 dB @ 17 MHz, assuming that it follows approximately a
law.
Cabling Distances
The values given in Table 36 are for information only, as the distance is dependent on
the quality of cable used.
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.
Setting the Earthing on DS3 and E3 Daughter Cards
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.
Refer to
the
Media Module Reference Guide
to determine which jumpers are required
to meet your requirements.
Table 35. E1/DS3/E3 Coaxial Cabling Details
Daughter Card Type
Cable Type
Impedance
Attenuation
E1
RG59
75 ohm
6 dB Max
@ 1.024 MHz
DS3
RG59
75 ohm
25 dB Max / 100 m
@ 400 MHz
E3
RG59
75 ohm
25 dB Max / 100 m
@ 400 MHz
Table 36. ATM Device Cabling Distances
Daughter Card Type
Cable Type
Maximum Proposed Distance
E1
RG59 coax
300 m (984 ft)
DS3
RG59 coax
68 m (225 ft) default
135 m (450 ft) (see note)
E3
RG59 coax
100 m (330 ft) based on a power budget
of 12 dB @ 17 MHz
f
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