ECI XDM-300, Руководство по установке и обслуживанию

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XDM-300 Installation and
Maintenance Manual Before You Start
417006-2311-0H3-A00 ECI Telecom Ltd. Proprietary 2-17
Timing (Clock) Cables
The ECU300/ECU300-F on the XDM-300 shelf has two timing reference
connectors, T3_1/T4_1 and T3_2/T4_2, which are used for 2.048 Mbps signals
and have balanced (120
Ω
) G.703 interfaces.
The cables used to connect to these connectors are prepared on site, and they
comprise individually shielded twisted pairs (the same type of pairs needed for
connection to the balanced E1 tributary interfaces).
If the site timing reference distribution subsystem has unbalanced (75
Ω
) G.703
interfaces, a 120
Ω
/75
Ω
adapter can be supplied for mounting on the
T3_1/T4_1 and T3_2/T4_2 connectors. This permits using coaxial cables
(BT3002 or equivalent) of the same type used for connecting to balanced E1
tributary interfaces.
Electric Traffic Cables
Some electric traffic cables can be prepared on site. The following table lists
the type of cables and mating connectors needed for each XDM-300 traffic
interface type.
N
OTE
:
The connectors are identical regardless of whether
the traffic cables are connected directly to the I/O modules or
to TPMs on the TPU.
Table 2-3: Traffic cables mating connector data
I/O module Interface type Cable type Mating
connector Qty/
Module
PIM2_21 E1 balanced
(2.048 Mbps) Twin multipair cable (2 x
21 shielded 120
Ω
twisted
pairs)
Twin 50-pin
SCSI male 1
PIM2_63/B
PIM2_63 E1 balanced
(2.048 Mbps) Twin multipair cable (2 x
21 shielded 120
Ω
twisted
pairs)
Twin 50-pin
SCSI male 3
PIM345_3 E3 and DS-3
(34/45 Mbps) NCX coaxial cable DIN1.0/2.3
male 6
SIM1_4/E
STM-1
electrical
NCX coaxial cable
DIN1.0/2.3
male
8
SIM1_8
1
STM-1
electrical NCX coaxial cable DIN1.0/2.3
low profile
male 16
1
SIM1_8 configured as STM-1 electrical module with ETR-1 electrical SFP transceivers.