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Tellabs 258E Mounting Assemblies

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Technical Manual
76.810258X-C
February 5, 1997
258X Mounting Assemblies
Contents
1. General
1.1 The 258X Mounting Assemblies are a family of 16-position, 483mm (19-inch) rack-mount
Configurations
1.2 Five models of the 258X Mounting Assembly are available. Three are electromagnetic com-
Features
1.3 The 258X Mounting Assemblies provides the following features:
is a registered U.S. trademark of Tellabs Operations, Inc.
Section 1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Section 2. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Section 3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section 4. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Section 5. Troubleshooting, Technical Assistance, Repair and Return. . . 15
echo canceller enclosures designed to support Tellabs E1 echo canceller applications.
patiblility (EMC) -compliant, and these are equipped with a metal front door and metal covers
over the upper and lower portions of their printed-circuit-board backplanes. Removal of one
or more of these items causes the assembly to become non-EMC-compliant. Table 1-1
lists the 258X assemblies and their distinguishing characteristics.
model
impedance
EMC compliant
258E
75 ohms
258F
120 ohms
258J
75 ohms
258K
120 ohms
258M
75 ohms
Table 1-1
Product Feature Matrix
•
capacity of sixteen 2581/2582 modules OR of fourteen 2581/2582 modules when an
optional 2581MC/2582MC Master Canceller is installed in slot 15
•
483mm (19-inch) mounting, standard; 584mm (23-inch) mounting, optional
•
shipped center-mount (projected) standard, or can be configured to flush-mount by
customer
•
slots for redundant 5140A plug-in dc power converters (one converter is mandatory)
•
dc input power range of –40 to –75Vdc (nominal –48Vdc), positive ground
•
75-ohm BNC, 75-ohm mini-coax (1.6/5.6), or 120-ohm wire-wrapping PCM (E1) connec-
tors (model-dependent)
PCM (E1) connector type
yes
BNC
yes
wire-wrapping
no
BNC
no
wire-wrapping
yes
mini-coax (1.6/5.6)
Practice Section 810258X
©1996, 1997, Tellabs Operations, Inc.
All Rights Reserved, Printed in USA
1 of 16

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Summary of Contents for Tellabs 258E

  • Page 1 1. General 1.1 The 258X Mounting Assemblies are a family of 16-position, 483mm (19-inch) rack-mount echo canceller enclosures designed to support Tellabs E1 echo canceller applications. Configurations 1.2 Five models of the 258X Mounting Assembly are available. Three are electromagnetic com- patiblility (EMC) -compliant, and these are equipped with a metal front door and metal covers over the upper and lower portions of their printed-circuit-board backplanes.

  • Page 2: Reference Documents

    They offer the capability of integral dc power-converter redundancy. Note: Tellabs recommends that two dc power converters be used in the 258X Mounting Assemblies. With redundant dc power converters, if one fails, the other has the capacity to carry the entire load.

  • Page 3: Installation

    (23-inch) relay rack. In either case, the assembly occupies 257mm (10.1 inches) of vertical rack space. 3.3 Tellabs recommends that one 2U heat baffle (part no. 80.2187) be installed between each 258X mounting assembly for ventilation. This heat baffle occupies 89mm (3.5 inches) of ver- tical rack space (two mounting spaces).
  • Page 4 CONTROL PORT OUT DEFERRED SPLIT 1 BANK OF 16 SHELF SERVICE END OF MAINTENANCE SHELF SHELF ADDRESS SWITCH CONTROL SELECT SWITCH 4 IS THE LSB Lower Figure 3-2 258E Mounting Assembly with BNC-Type PCM Connectors on Upper Portion Rev C 2/5/97...
  • Page 5 Practice Section 810258X R in R in R in R in R in R in R in R in R in R in R in R in R in R in R in R in S out S out S out S out S out S out...
  • Page 6 PCM connectors as follows: • For the 258E assembly (75-ohm BNC-type PCM connectors), R in COM and S in COM are capacitively coupled to frame ground while R out COM and S out COM are hard- wired to frame ground.
  • Page 7 Practice Section 810258X 3.9 For the non-EMC-compliant 258J assembly, no frame ground connection is made to the cable shields of its 75-ohm BNC-type PCM connectors. For the non-EMC-compliant 258K assembly, the frame ground connections are made by attaching each cable’s drain wire to the frame ground (middle) pin on the associated 120-ohm wire-wrapping connector.
  • Page 8 The TST (test) pin is connected to the GND (system ground) pin to perform a flash down- load of system software when doing a firmware upgrade. Please refer to the Tellabs 2500-Series Universal Firmware Download Program (UFDP) manual (practice section 812500UFDP) for instructions on performing such a firmware upgrade.
  • Page 9 Practice Section 810258X switch S2 assembly partitioning arrangement position one bank of 16 echo cancellers OFF (down) two banks of 8 echo cancellers ON (up) Table 3-1 Switch S2 Setting Summary Cable Construction and Connection to DTE 3.23 Two 25-pin female D-subminiature connectors, J5 (labeled CONTROL PORT #1 IN) and J6 (labeled CONTROL PORT #2 IN), are provided for connecting DTE to the Control Port(s).
  • Page 10 Practice Section 810258X Shelf Addressing in Daisy Chains 3.25 Shelf addressing in a daisy chain is assigned via four-position SHELF SELECT DIP switch S4. This switch must be correctly set for proper communication with each 258-series echo canceller in the chain. The slot or canceller address is the same for the Control Port and Maintenance Port.
  • Page 11 Practice Section 810258X Connections and Switch Settings for Control-Port Daisy Chain Note: See paragraphs 3.24 and 3.23 for information on connector usage for Control- Port daisy chains. 3.30 Connector J7 (labeled CONTROL PORT OUT), a 25-pin female D-subminiature connector, is used only when two or more 258X assemblies are to be daisy-chained to one another via their Control Ports (see note below).
  • Page 12 Practice Section 810258X 3.32 Set the 258X-assembly option switches as follows for Control-Port daisy-chain setup: 1. On the last 258X assembly in the daisy chain, set S1 (END OF PORT CONTROL) to ON. On all other mounting assemblies in the daisy chain, set S1 to OFF. 2.
  • Page 13 Practice Section 810258X from J3 in daisy dhain to J4 in daisy chain (DCE) (DCE) cable wiring signal J3 pin no. J4 pin no. signal FRAME GND FRAME GND TXD-C TXD-C RXD-C RXD-C MENU MENU Figure 3-10 258X-Assembly Maintenance-Port-to-Maintenance-Port Daisy-Chain Cable Wiring 258X Mounting Assembly No.

  • Page 14: Specifications

    • Via screw terminals that accept 10 to 14AWG wire Alarm Connections • Via 0.045-inch square wire-wrapping posts 75-ohm PCM Connections • Via BNC plug connectors (258E and 258J) • Via mini-coax (1.6/5.6) connectors (258M) 120-ohm PCM Connections • Via 0.045-inch square wire-wrapping posts (258F and 258K) Environmental •...

  • Page 15: Troubleshooting

    (if possible) and conduct testing again. If the substitute oper- ates correctly, the original should be considered defective and returned to Tellabs for repair or replacement as directed in paragraph 5.3. We strongly recommend that no internal (com- ponent-level) testing or repairs be attempted on the equipment.

  • Page 16: Repair And Return

    5.4 Repair service includes an attempt to remove any permanent markings made by customers on Tellabs equipment. If equipment must be marked, it should be done with nonpermanent materials and in a manner consistent with the correct handling of electrostatically sensitive devices.

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