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1-Port T1/E1 Mini-Physical Interface Module (SRX-MP-1T1E1-R) | SRX300 Series and SRX550 High Memory Gateway Interface Modules Reference | Juniper Networks TechLibrary
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Cisco Third-Generation 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Card - expansion module - EHWIC - T1/E1 x 2
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