IBM Nways 8260, Руководство по установке

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Appendix A. Technical Information
E1/T1/J1 and E1/T1/J1 IMA I/O Card
The E1/T1/J1 I/O Card conforms with:
Ÿ
ANSI recommendations T1.102-1993 and T1.107-1995 for the line interface at
1.544 Mbps, and recommendations T1.646-1995 for the transportation mode.
Ÿ
ITU G.703/G.704/G.706 recommendations for E1 at 2.048 Mbps.
The E1/T1/J1 IMA I/O Card conforms with:
Ÿ
ATM Forum: AF-PHY-0016.000, AF-PHY-0064.000, and AF-HY-0086.000d
Ÿ
ITU-TS: G.704, G.706, G.804, G.823. G.826, G.832, I.431, and I.610
Cabling Information
Table 4 details the accepted cable types for the E1/T1/J1 and E1/T1/J1 IMA ATM
ports.
Note: The values given assume that the attenuation follows approximately a
√
f law.
For more information, refer to the IBM 8250 Multiprotocol Switching Hub, IBM 8260
Multiprotocol Intelligent Switching Hub, IBM 8285 Nways ATM Workgroup Switch,
Planning and Site Preparation Guide, GA33-0285, or the IBM 8265 Nways ATM Switch
Media Module Reference Guide, GA33-0460.
Table 4. E1/T1/J1 Cabling
Connection Type Cable Type Impedance Attenuation
E1 (twisted-pair) STP 120 ohm 6dB @ 1.024
MHz
T1/J1 (twisted-pair) STP 100 ohm 15dB @ 772
KHz
E1 (coaxial) RG59 75 ohm 6dB @ 1.024
MHz
Cabling Distances
Because the maximum recommended distance depends on the quality of cable used,
the values given in Table 5 on page 24 are approximate.
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Copyright IBM Corp. 1996, 1998
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