3Com 3C63100-AC-C - PathBuilder S600..., Справочное руководство

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130 C
HAPTER
5: C
ONFIGURING
P
ATH
B
UILDER
S600 M
ODULES
, P
ORTS
,
AND
A
PPLICATIONS
Figure 92 DS1 UNI Port Configuration Menu
4 Set the following parameters as desired:
LBO (DS1 only)—Line Build Out. The setting for the transmit signal level: 0, 7.5,
15, or 22.5 db . The LBO compensates for the distance between the card and the
CSU/repeater. It is a setting for the transmit signal level.
Line Code (DS1 only)—The zero code suppression technique configured to the
DS1 port interface: B8ZS for DS1; HDB3 for E1. This is a read-only parameter.
B8ZS —Binary 8 Zero Substitution; a T1 (1.544Mbps) carrier line coding format
used to accommodate “ones density” for clear channel transmission.
HDB3 —High Density Binary 3 zero Substitution; an E1 carrier line coding
format
Framing —The type of frame organization configured for the T1 port interface:
D4 or ESF for DS1. Set this parameter to match the service provider or device
connection framing. For E1, Framing is a read-only parameter and is always set to
multi-frame .
CAUTION: A framing mismatch can cause LOF, OOF alarm conditions and result in
traffic loss.
Timing— The type of input clock service configured for the DS1 module. Set the
timing source to system if you are using the DS1 module to connect to the
network.
System —Configures the DS1 module to use the internal clock as the timing
source.
Loop —Configures the DS1 module to use the input port Rx clock as the timing
source; timing is received from the service “loop.” Select Loop if the DS1 UNI
module is used for the network/carrier service termination, in which case the
carrier (the service “loop”) typically provides the timing source.
Gain Limit (DS1 only) — Setting for the receive signal level: 26 or 36 dB .